Security gates, also known as metal detector doors. This is the gate metal detector. It is mainly used to detect whether a person's body carries metal objects. With the development of society and the diversification of demand, the application of security gates has become more and more extensive. However, according to the contact between the technicians of the pastoral and the security gate users, many customers have realized the use of security gates. Misunderstanding: 1. The user believes that the security door can detect all prohibited items, including dangerous substances in liquid, powder and other conditions. 2. The user thinks that the security door can only give an alarm prompt for the controlled tool, but can completely exclude other metal or electronic items such as belt buckles and mobile phones. 3. The user thinks that the security door can be installed normally in any environment without any influence. 4. The user also believes that the security door can display the exact location of the human body through the image after detecting the prohibited item. In response to the above customer's understanding, the pastoral security inspection is here to explain with you one by one, so as not to cause unnecessary misunderstanding in the later period: 1. The current general security gates in the market refer to metal detector security gates (except for the latest millimeter wave human body security devices and terahertz human body security devices). That is to say, only articles containing a certain amount of metal can be detected, and articles without any metal components can not be detected. 2. Up to now, metal detection security doors, including imported security doors, have the ability to adjust the sensitivity of detection, and can also detect mobile phones and controlled tools without excluding some zippers, buttons, and small keychains. However, the principle of this exclusion is obtained by r

A terrorist attack on the Russian subway was initially suspected to be a loophole in the subway security system. On the afternoon of April 3, in Russia, a subway from St. Petersburg's [Hay Square Station" to [Technology College-1 Station" exploded, and the explosion was located in the third carriage of the subway. The explosion was caused by a small homemade device with an explosion equivalent of about 200-300 grams of TNT, including destructive items such as steel nails. After the explosion, various government departments in Russia responded quickly and rescuers arrived at the scene five minutes after the incident. Local time 15:00: The Russian National Counter-Terrorism Committee stated that a kilogram of shougongzhadan disguised as a fire extinguisher was discovered and destroyed at the St. Petersburg Uprising Square subway station. Local time 15:40: All subway stations are closed. Local time 15:53: The subway station evacuation work is all over. Russian President Vladimir Putin is preparing to hold talks with Belarus`s overall Lukashenko at the time of the explosion. He quickly responded that the relevant authorities have launched a comprehensive investigation on the matter. Two hours after the incident, the Russian Attorney General`s Office declared the St. Petersburg subway bombing as a terrorist attack. At present, the cause of the incident is still under investigation. According to the Russian "Rambler" news network, Sergei Goncharov, president of the Russian "Alpha" anti-terrorist army veteran association, said in a live broadcast of "Russian 24" that Russian President Vladimir Putin is inspecting in St. Petersburg during the St. Petersburg subway terrorist attack. This is no coincidence. On the day of the explosion, Russian President Vladimir Putin met with Belarusian President Alexander Lukashenko in St. Petersburg and participated in the [Truth and Justice" media forum. So how did the terrorists bring the bomb into the subway? Investigat

In order to ensure the safety of the masses of the people, the security and security work and methods of various places are also emerging. According to the Shenzhen News Network: Recently, a new type of human body security instrument has been added to the Futian Station of Shenzhen Metro, which has aroused public concern. When taking the subway from Futian Station, in addition to the routine routines such as baggage check-in security, the passengers will be told by the security inspector that they need to pass through the human body security scanner before they can pass. The reporter experienced the whole process and found that the entire scanning process took about time. 2 seconds or so. Many people at the scene told the reporter that the efficiency of the human body security device is very low, and it is really not a big deal to put only one device at present. The reporter saw the human body security instrument that triggered the public's hot discussion at the entrance and exit of No. 31 Futian subway station. It is understood that this security device is called the TAI-30 millimeter wave human body security instrument. It was posted by the Shenzhen Public Security Bureau Bus Branch a week ago. The pilot project of Futian Metro Station was the first in the city. The purpose is to further enhance the public safety of the Shenzhen Metro area and prevent prohibited items such as inflammables and explosives from entering the subway. At the same time, the pilot is mainly to explore the security inspection mode that can improve the security check speed of subway stations through high-tech trials. According to the on-site staff, the human body security instrument has been in operation for a week. The people in the queue at the peak period will be longer than other security ports. Some passengers will choose other security ports. According to the staff, the millimeter wave personal security instrument used in the pilot has a center frequency of 35 GHz and is harmless to t

Since its discovery, X-rays have been used in medical clinics for their unique penetrability, photosensitivity, ionization and biological effects. Medical diagnostic X-ray examination is an indispensable medical imaging examination in clinical medical technology because of its high diagnostic value, but it can cause harm to the human body if it is used improperly. Pay attention to the following points during use: 1. The X-ray machine and medical X-ray equipment users of security inspection must learn the X-ray professional technology of the system, be familiar with the structural principle, performance and specification characteristics of the machine, master its operating procedures and safety protection rules, and strictly follow the formal operating procedures. . Instrument safety: Before each shutdown and power-on, adjust the instrument pointers such as the gauge and power meter to the lowest position, and then adjust to the normal condition when using it, so as to avoid the instrument suddenly disconnecting power and smashing the pointer. 2. Strictly control the use conditions: firstly, the power supply voltage should be calibrated after starting the power; the filament voltage should not be too high, and the voltage of the filament directly affects the volatilization degree of the X-ray tube filament. Therefore, it must be used correctly according to the regulations, and the machine should be shut down in time after the machine is stopped. In order to avoid the reactive power consumption of the filament. 3. Remember to prohibit over-capacity. Use X-ray machine for super-kV. When using X-ray machine, be careful not to overload the machine. Generally, under the premise of meeting the diagnostic needs, try not to exceed 80% of the rated X-ray tube capacity. . For X-ray machines with long service life, the conditions should be reduced as much as possible. 4. When the machine is in continuous use, pay attention to the intermitte

The security X-ray machine is one of the X-ray machines and refers to the X-ray machine used for security inspection in public places. It can be seen at airports, public inspection units and other places. It has a strong practicality and can check almost any item. The security X-ray machine is an electronic device that performs inspection by means of a conveyor belt to carry the inspected baggage into an X-ray inspection channel. The baggage enters the X-ray inspection channel, which blocks the package detection sensor, and the detection signal is sent to the system control section to generate an X-ray trigger signal that triggers the X-ray source to emit the X-ray beam. A bundle of X-ray beams passing through the collimator passes through the object to be inspected on the conveyor belt, the X-rays are absorbed by the object to be inspected, and finally the dual-energy semiconductor detector mounted in the channel is bombarded. The detector converts the X-rays into signals, which are amplified and sent to the signal processing chassis for further processing. X-ray is an electromagnetic wave that can penetrate opaque objects such as metal, ceramic, glass, wood, cardboard, and leather. The Makino intelligent security X-ray machine can display images of different colors on the display according to the degree of X-ray absorption of the object. Simply put, orange represents organic matter, such as food, plastic, etc.; books, ceramics, etc. are shown in green; metals are shown in blue. At this time, the security inspector can quickly check the perspective image of the X-ray scan, and can rely on rich experience to judge whether there is a contraband. With the development of technology and continuous improvement, the current security X-ray machine also has the function of identifying, analyzing and alarming specific items. It will play an increasingly important role in the security field.

X-ray security inspection machine - is a classification of X-ray security inspection equipment, also widely known as X-ray machine, X-ray scanner, security inspection machine, security X-ray machine, security instrument and so on. That is to say, the X-ray penetrating imaging principle is adopted, and the baggage parcel is inspected in the form of an image after being collected and processed. The Mama Security X-ray adds a number of accessibility features to traditional technologies: 1. Automatic sensing function: After the X-ray machine is turned on, it automatically enters the standby state. At this time, the belt is static by default. When a person puts the baggage package on the conveyor belt, the security check-up machine automatically starts the operation through weight sensing or infrared sensing. Detection, within 0-1 hours (can set the time freely), if no other baggage is placed, the conveyor will automatically stop running. It is convenient and energy efficient. Of course, this is an essential additional feature. 2, automatic identification of items: This is a very practical function, the Makino security inspection machine has the ability to detect, identify, prompt, and standard items. The animal husbandry security inspection machine can identify and alarm the tools, weapons, gasoline, ethanol, toluene, sulfuric acid and other items, greatly improving the security inspection efficiency and reducing the work intensity and effectiveness of the security personnel. 3. Consistent identification of the identity of the person and the person: Through the consistency record of the identity of the person and the articles carried, the effectiveness of the relationship between the person and the object and the retrospective effect are effectively increased, and the pre-criminal personnel can be alerted in advance. . 4. Remote monitoring and management: The Makino X-ray machine can manage and view t

To whom may it concern, The horrific terrorist attack in Sri Lanka on Easter Sunday resulting in precious lives lost & hundreds injured. 138 people have been killed in Sri Lanka, with more than 600 badly injured, in a terrorist attack on churches and hotels. ISIS claims responsibility for it. Suicide bombings in Sri Lanka will trigger market demand for security inspections, not just in Sri Lanka itself, but also around countries like India, Bangladesh, even all around the world. As an original manufacturer of security products like HHMD(Handheld metal detector, Walk through metal detector, Under Vehicle Inspection mirror/camera, X-Ray baggage scanner and Food metal detectors, our company -Shenzhen Houlong Technology Co., Ltd with its brand Mama Security are ready for supporting our partners all around the world to provide high quality and cost-effective security inspection products. We have been always taking the responsibility to maintain the security of the fortune and people's lives. Please don't hesitate to contact us if you feel the same or has any inquiry on our products.

GP-3003B1 Handheld Super Metal Detector Part I. Product description: GP-3003B1 handheld super metal scanner. This is a unique hand-held metal detector developed by our company. All of them are made of imported high-quality components. The detection accuracy is high, the operation is simple, the appearance is novel and beautiful, the sound is crisp and loud, and the startup and detection alarm lights and sound and light are automatic. Conversion function,. It is especially suitable for the safety inspection of public places or factories where the sensitivity of detection is extremely high, such as airports, public security, border defense, courts, prisons, stadiums, exhibition venues, entertainment venues, station terminals, etc., precious metal manufacturing and processing enterprises such as: Anti-theft inspection of jewelry, electronics, hardware, automobiles and other enterprises. Handheld Metal Detector, Hand-held metal detector, hand held metal detector, hand held super scanner. Part II. The characteristics and application: 1, ultra-high sensitivity, stable performance, suitable for detecting all metals. 2. Alarm mode: sound and light synchronous alarm (with vibration function). The battery can be connected to the charger function (optional charger) and has a low voltage indication function. 3. When the power is low, the detection distance does not change. Stable performance.

MD-3003B1 Handheld Meortal Detect Part I. Product description: MD-3003B1 metal detector is a popular hand-held metal detector developed by Shenzhen Jingyan Security Inspection Equipment Co., Ltd. All components are made of high quality components. The scanning area is large, the performance is stable, durable, and the operation is simple. The type is light and beautiful, the sound is crisp and loud, mainly used in places where metal detection is required, such as security metal anti-theft inspection, examination room, school to prevent the use of communication tools for cheating inspection, and unspecified metal detection sites. The use of the hand-held metal detector for personal inspection can avoid human rights disputes caused by manual searches. super scanner metal detector, hand held super scanner, hand-held super scanner. Part II. The characteristics and application: 1. Simple and convenient operation, stable performance and low failure rate. 2. There are two sensitivity options: high and low. Sensitivity can be adjusted according to site requirements. 3, the alarm mode has two choices of sound and vibration 4, low power consumption, can operate for 40 hours. Automatic continuous sound or vibration alarm when the battery is used up; 5, there are boot, shutdown sound or vibration prompt function; 6, using the battery, can be connected to the charger function (charger optional) 7. When the power is low, the

The JT-DV6 is a versatile 360-degree rotating vehicle inspection imaging system. Real 1080P dual HD 3 million vehicle inspection video scanner. Under Vehicle Scanner, Car Surveillance System The 7-inch high-definition color LCD display simultaneously displays scanned images and supports 64GB SD card storage; Support photo, video, playback. The video sync display has no delay. The effect catches up with ipone 5S. One-button open patented sunshield and 5000mAh large-capacity battery for easy outdoor carrying. The LEMO Remo HD digital interface is rugged and does not fall off. Under Vehicle Search System 2 meters lightweight telescopic arm mirror without jitter, 3 million high-definition camera with 6 LEDs allows you to view the real situation of the narrow and dark places in the form of video in front of your eyes, analysis and processing problems handy. The 3 megapixel anti-vibration chassis HD camera is equipped with 16 high-brightness LEDs to see farther and clearer. Wear-resistant industrial grade universal chassis wheels for vehicle bottom inspection in all road conditions. The high-grade pressure-resistant and durable aluminum alloy case is easy to carry. Under Vehicle Search System Specification and Parameters:

JT-V5 vehicle safety inspection mirror Part I. Product introduction JT-V5 is a very popular vehicle safety inspection mirror launched by Precision Inspection Equipment Co., Ltd., 30CM large square convex mirror, high power bright white LED light, rechargeable battery. Economical and portable, simple and clear, with four supporting wheels, it is light and easy to move. It has a wide range of poles and is suitable for different angles. It is a security inspection tool widely used to check the bottom of cars, tables, stools, etc. Part II. Product specifications Mirror: Square 30*30 cm acrylic high-strength anti-shatter mirror, convex 2 times magnification effect, is 1/2 weight of ordinary same-size glass mirror, has certain toughness, is not easy to break, safe and durable, brightness is the same as glass mirror. The lacquered iron-bottomed full-enclosed square mirror can effectively prevent the damage caused by the collision and the mirror. Lowest detectable height: 9CM Grip: The T-shaped 1.1-meter long telescopic pull rod maximizes the depth of the vehicle and items being detected. Made of high-quality aluminum structure and multiple high-strength processing, light weight, strong and beautiful. The surface is treated with a dust-free workshop and baked outdoor paint. It has no fading for a long time, no odor, and is harmless to the human body. Equipped with a black foam cotton handle for a good grip for long hours.

JT-V3 vehicle inspection mirror Part I. Product introduction The JT-V3 vehicle inspection mirror is suitable for use in homes, garages, schools, checkpoints, customs borders, etc. The JT-V3 is economical and portable, simple and clear, with three supporting movable wheels for light weight. It is used to check whether there are abnormal security tools at the bottom of the car, table, stool, etc. The following is a product introduction of the JT-V3 vehicle inspection mirror: Part II. Product description 1. Mirror surface: 30CM convex mirror with a convex shape and 2 times magnification effect. It has strong toughness, is not easy to be broken, and is safe and durable. Surrounded by the bottom paint, it can effectively prevent the damage caused by the collision. 2, the lowest detectable height: 9cm 3. Grip: Retractable lever, which can reach the bottom of the detected vehicle and articles to the maximum extent. Double-ball shrapnel and plastic ring double-safe positioning. It adopts high-quality aluminum structure, light weight, strong and beautiful. The surface is treated with a dust-free workshop and baked outdoor paint. It will not fade in the long-term use and has no odor. Equipped with a black foam cotton handle for a good grip. 4, light source: led light source. The LED lamp has long life, high brightness and waterproof, and can be disassembled to function as a flashlight. 5, easy to carry: our products can be folded, after the fixed one can be removed. It can be equipped with a carry-on bag that can be unpacked and stored

JT-V2 Under Vehicle Inspection Mirror Part I. Product introduction JT-V2 is a very popular vehicle safety inspection mirror launched by Precision Inspection Equipment Co., Ltd., 20CM lightweight convex mirror, high power high brightness LED flashlight. Economical and portable, simple and clear, unique rotating shaft and locking device ensure flexible rotation and smooth operation of the telescopic arm. After use, it can be fully received into the handle for easy carrying and storage. It is mainly used as a powerful tool for inspecting dead corner areas that cannot be directly observed when personnel are surveying the scene. Such as: the bottom of the car, shaft, roof, underground, table bottom, lamp pool, ceiling, chandelier, etc.; its mirror angle can be adjusted according to needs Part II. Product specifications Mirror: Square 20*20 cm acrylic high-strength anti-shatter mirror, convex 2 times magnification effect, is 1/2 weight of ordinary same-size glass mirror, has certain toughness, is not easy to break, safe and durable, brightness is the same as glass mirror. The lacquered iron-bottomed full-enclosed round mirror can effectively prevent the damage caused by the collision. Grip:

In today's society, people are particularly important for food safety. The name is food, and safe food is more acceptable. To check whether the food is safe, the food metal detection equipment is used. This is a special inspection instrument for food. It can detect a variety of items and has been highly valued and widely used by the food industry. Why would you use it? To know that nothing can't be established in the market without any skill, now we can simply look at the "four major specialties" of food metal detection equipment, which is also an advantage. Food metal detection equipment advantages: 1. Hygienic design, easy to clean; 2. It can avoid product accumulation, blockage and cause mold; 3. Quick release lock can ensure quick installation and disassembly of the reject device; 4. Equipment cleaning is quick and easy. The food metal detection equipment has the sensitivity adjustment function, which can be adjusted according to the actual use situation; waterproof and rustproof, protect the equipment, hygienic and easy to clean; leakage detection function increases the safety of equipment use; self-test function, automatic Check the equipment to determine whether it is normal, to avoid unnecessary maintenance of the equipment; automatic alarm function, when detecting metal impurities, the sound and light devices will alarm at the same time and stop running. Special transmission mechanism design Zui Dacheng metal detection sensitivity, modular design can be flexibly customized according to different requirements, mirror stainless steel, open transmission system, easy to clean. Over the years, the company has continuously innovated and developed through continuous efforts and the introduction of technology that absorbs the Japanese Yudao needle detector. Now it has strong technical strength and development capabilities to make the products constantly updated.

Security gates from a wide range of fields, in addition to general manufacturing companies, such as electronics, wire and cable, electrical appliances, gold and silver jewelry, precious metals and other processing industries, can also be used in government departments, such as police, courts, procuratorates can also be applied to Public places such as stadiums, exhibition halls, museums, etc. The third is for temporary metal security doors. Safety gates can also be applied to the need for scientific prevention. Use requires attention. Through the security gate, the magnetic field in the area can reduce the entry of workers and metal objects, ensuring accurate, objective and complete, without human intervention. 2, security door using common sense metal detection security door, size 2220 mm (h) X820mm (w) X522mm (d), channel size 2000 mm (height) X700mm (w) X522mm (d), although the size is not strictly regulated However, based on the standard size, the error cannot be greater than 50 mm, and more custom non-standard sizes. Note that if you want to use it, in addition to the full rainproof security door, the security door is generally not rainy, and the outdoor activities must be added to the non-waterproof security door. At the same time, within 1 meter of the safety door, there must be no large metal objects, so as a large steel door, elevator, iron, and not near the object to generate a magnetic field, such as distribution boxes or electrical equipment. Security objects pass through the security gate, when you want to traverse, queue, but should not touch the door. 3, security door to buy a security door to buy must pay attention to the product has a high level of security features. The magnetic field distribution should be uniform, 100%, to distinguish smaller metal objects from the consistency of individuals carrying various metal objects. In addition, the security door must have good immunity, whether it is motor type noise and small metal moving vibration noise

Two explosions in Pakistan in one day killed 132 people An explosion in Pakistan's Balochistan province killed 128 people On the 13th, a campaign of suicide bombings in a campaign in the Mersdon region of Balochistan province in southwestern Pakistan. According to local media reports, the attack has killed at least 128 people and injured about 150 others. The extremist organization claimed to have created the attack. According to local media reports, in the afternoon, the Balochist People`s Party held an election rally in the local area. When a team leader of the party arrived at the rally, a suicide bomber detonated the explosives carried on him, causing a large number of casualties. Local police said more than 1,000 people were present at the time of the incident. After the attack, security personnel and rescue workers launched an emergency response and sent the injured to a local hospital. Quetta City Hospital, the capital of Balochistan Province, announced its entry into a [state of emergency". Pakistani President Hussein and Transitional Prime Minister Al-Mulq condemned the attack on the same day and demanded that the entire party rescue the injured. At present, extremist organizations have claimed responsibility for the attack. Balochistan is located in southwestern Pakistan. Al Qaeda and the Pakistani Taliban have long been entrenched in the mountainous areas of the province. In addition, extremist organizations have begun to infiltrate into the region in recent years, and terrorist attacks have occurred in the local area. Bomb attack in Khyber Pakhtunkhwa Also on the 13th, a bomb attack on political party leaders occurred in the Khyber Pakhtunkh province of northwestern Pakistan, killing at least four people and injuring 39 others. According to local media reports, the attacker detonated a bomb that was previously installed on a motorcycle. Pakistan`s re

How large is the security equipment, security inspection equipment, baggage security inspection machine, security inspection machine, X-ray machine Is the radiation from the security equipment of the subway, railway station and airport "shooting people"? We must make clear: ● The security door that the personnel pass is a metal detector, not an X-ray device. The inspection of the item is to use X-ray. ● From the data point of view, the standard radiation leakage dose of the security inspection machine is close to the radiation background value of the natural environment, and there is no risk of radiation from the side. Recently, the media reported that there may be a radiation leak in the Shenzhen Metro security inspection machine. Since then, some inspection machines of the Shenzhen Metro have been suspended. The Provincial Environmental Protection Agency has also issued a document requesting environmental protection law enforcement inspections for radiation installations throughout the province. The aftermath of the incident has not been broken. Many people still worry that they have been exposed to security screening machines. Have they been exposed to nuclear radiation? Pregnant women are even more worried. Will the security screening machine harm the intra-abdominal baby? Director of Nuclear Medicine, Sun Yat-sen Memorial Hospital, Sun Yat-Sen University, China Professor Jiang Ningyi, vice president of the Nuclear Medicine Branch of the Physician Association, said that [radiation" is daunting. In fact, radiation is everywhere, and it is closely related to people's lives. [It can be said that human evolution is accompanied by radiation." 80% of radiation comes from nature Professor Jiang Ningyi said that "radiation" includes natural radiation and artificial radiation. 80% of the radiation received by the human body comes from nature, including cosmic rays in outer space, helium, and radioactive radiation naturally pr

Select the same metal sample to detect the gate, the smaller the better. Traditional safety doors should be able to detect all metals (except for specially designed detectors), and all metals can be tested in strict accordance with the [sensitivity" standard of the gb15210 - 2003 national standard. The metal samples we choose are best included in the national standard. Metal signal detection capability is the hallmark of the metal detector manufacturer's technical strength. Manufacturers of non-ferrous metals and ferrous metals are able to perform the same detection, stability and good conditions to detect small metals, and the sensitivity control is clear. If the quality of the poor quality is slightly higher, when the sensitivity is high, nothing can cause an alarm, the sensitivity will be lower, and the metal can be used to alarm. This kind of safety door is due to poor internal circuit design, and the control is not linear and cannot be used. In addition, due to the direction of the electromagnetic waves, the metal detection is oriented, and in order to reduce the electromagnetic wave signal corresponding to the most powerful surface, the minimum surface-cut electromagnetic wave signal is correspondingly weakened. A good manufacturing company can handle the directionality of the magnetic field. Therefore, the effect of detecting a metal object in the same detection area is not different. If the difference is larger and the omission is greater, then the user should choose a product with good direction detection. The same metal object is selected by the tester to pass through the various locations of the security door, and the metal objects are passed in different directions in each location, and the products with less false negatives are selected. For the elimination of small metals, it is necessary to adjust the sensitivity to a suitable position when detecting a larg

The correct use of handheld metal detectors is as follows: 1. Turn on the power switch and hear a [beep" sound, indicating that the power is on and the green light is on. If the green light does not light, it means that the battery is not installed or the battery is not in good contact. If the sound continues to vibrate continuously or continuously, it means the battery can no longer be used. It should be replaced with a new one. 2, sound, vibration transfer switch selection: press the red button switch, the alarm mode is vibration. Release the red button switch and the alarm mode is sound. 3. After turning on the power, you can perform high-sensitivity detection. The wing technology reminds you that the hand grip handle sweeps the detection surface around the object to be tested. When there is metal object, it will sound an alarm or vibrate. At the same time, the green light turns red. Light; stop sweeping, alarm sound or vibration stops, red light turns green. 4. Low sensitivity test: If you need to eliminate objects with small volume in the metal, you can press and hold the low sensitivity switch. When the metal object is swept around, the alarm sound or vibration is emitted. At the same time, the green light turns into a red light; when the sweep is stopped, the sound or vibration stops, and the red light turns into a green light. Because the sensitivity is reduced by more than 5 times. Therefore, the measured metal is generally a relatively large metal. 5. Sanjibao Technology reminds you that sensitivity adjustment should be made if the detection distance does not meet the specified requirements or the sensitivity is too high to cause instability or sound or vibration when there is no metal detection in the human body. 6. Put the sound and vibration switch in the "release" state, use a small flat-blade screwdriver to extend from the small hole in the detector handle to rotate clockwise, adjust to the sound, then turn co

Security door manufacturer: Is the security door harmful to the human body? The security door is a detection device for detecting the presence or absence of metal objects, also known as a metal detector door. As the name implies, the function of the security gate is to check whether the person passing the security gate carries metal objects. The working principle is simply to form a magnetic field transformation to cause electromagnetic induction of metal objects, thereby discovering metal objects. Some high-grade security doors can further sense the shape of metal objects to determine whether they are dangerous objects such as knives. In summary, the security gate is passively inspected by a magnetic field, rather than the traditional sense of illumination. To make an inappropriate metaphor, we can regard the security gate as a super simplified version of the nuclear magnetic machine. Having said that, I think everyone has already understood that the security door has put an end to the so-called radiation hazard in principle. Through the security door, even passing the security door many times in a day will not cause harm to the body. The security door manufacturers are here, and we will popularize the radiation that people often mention. Radiation is divided into ionizing radiation and non-ionizing radiation. The former is high in energy and can cause rotation and power phenomena of atoms or molecules, such as nuclear radiation and X-ray radiation, which we must protect. The radiation sources encountered in our daily life, such as WIFI, mobile phones and sunlight, are non-ionizing radiation. Such radiation does not change the traits of the objects in principle, but the harmful effects of large doses of such radiation are still underway. Therefore, countries around the world still have corresponding restrictions on the generation of such radiation. China's safety standards are below 40 microwatts per square centimeter (μW/cm2), which is safe.

Metal Detector - The metal detector uses the principle of electromagnetic induction to generate a rapidly changing magnetic field using a coil that has an alternating current. This magnetic field can induce eddy currents inside metal objects. The eddy current will generate a magnetic field, which in turn affects the original magnetic field, causing the detector to beep. The accuracy and reliability of metal detectors depend on the stability of the electromagnetic transmitter frequency and is typically used from 80 to 800 kHz. The lower the operating frequency, the better the detection performance of iron; the higher the operating frequency, the better the detection performance of high carbon steel. The sensitivity of the detector decreases as the detection range increases, and the magnitude of the induced signal depends on the size and conductivity of the metal particles.

According to the United States "World News" report, the United States shot in the Douglas high school campus in Florida, and then cited the national security discussion on the campus. The New York State Assembly has proposed a proposal to install a new type of metal detector at the campus entrance and exit to prevent guns from being brought into the school to prevent similar shootings. Data Map: After the shooting at the Florida campus, the Coral Springs police warned the residents to stay away from the area and the police had surrounded the school closely. Senator Martin Golden, representing Brooklyn Berry, pointed out on the 14th that he had already proposed in the state`s Senate to install a new type of metal detector for schools in need, which would add a layer of defense to campus security. Gordon pointed out that the latest type of smart metal detector is different from the old metal detector that is currently widely used, not only does it radiate less, but also does not give students the bad feeling of entering the school as a security check at the airport. Frequent launches of new metal detectors in US school shootings In recent years, frequent shootings in American colleges and universities have increasingly appealed to campus security equipment such as new metal detectors and other security equipment. The shooting case at the Douglas High School campus in Florida triggered a major discussion of campus security across the country. Parents in New York City also launched a petition on the Internet, calling on the city`s government to allocate funds for bodyguards equipped with guns without a gun.

Handheld metal detector technology analysis The origin of hand-held metal detectors originated from archeology and treasure-hunting was initially developed and designed by European countries. Its purpose was to conduct metal negotiation and exploration, mainly for the detection of underground metals such as archeology, excavation, and so on. In other words, the main purpose of the initial development of metal detectors was to detect underground metal objects. Later, people found that the use of this technology for security inspection is also good, so the underground metal detection equipment will be transformed, the technology will also be transformed, so that its long-distance detection technology into a close-range detection method, we will see today Hand-held metal detector prototype. Analysis of the principle of technology: Metal objects generally have magnetic fields, which are only strong and weak. For example, iron and other ferrous metals have strong magnetic field sensing capabilities, while gold and other non-ferrous metals have weak magnetic field sensing capabilities. Since it can be induced by a magnetic field, the metal detection principle can detect and respond to changes in the magnetic field. This is the design principle of most current detectors.

Security door manufacturers talk about the use of security doors Precautions 1. Except for full-rain protection type security doors, other types of security doors should not be exposed to rain, and they must be covered under the open air. 2. There must be no large metal objects within 1m around the security door, such as large iron gates, elevators, and large iron posts. 3, security door installation must be fixed and secure, to avoid the wind or collision caused by door body shaking. 4, away from objects that generate magnetic fields, such as distribution boxes, electrical equipment. Through regulations 1. The queues pass in order, cannot be crowded, and cannot be deliberately slowed down. 2. When there is no alarm, the second person can pass the first person out of the door; when the alarm occurs, the alarm sound must be stopped before it can pass. 3, can not hit the door when passing. 4. When passing through, the outside of the door cannot pass through people carrying metal objects. maintenance 1, the door surface stains can be wiped with a damp cloth. 2, oil traces and more difficult to clean the stains can be used day water, alcohol, wipe water wipe. 3, need to shut down more than 2 hours a day, to prevent overheating long-term components and reduce performance.