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Walk through metal detectors typically use pulse induction (PI) technology. The PI systems send powerful, short bursts (pulses) of current through the coil of wire. Each pulse generates a short magnetic field. When a piece of metal passes through the magnetic field, a reflected magnetic field is created. This magnetic field then reacts with the receiver coil, which, in turn, triggers the alarm system. This initiating spike lasts a few microseconds (millionths of a second) and causes a current to run through the coil. This subsequent current is called the reflected pulse and lasts only about 30 microseconds.
The walk through metal detectors create large magnetic fields that cover all of the space inside the rectangular arch of the metal detector. If a person walks through the metal detector and sets off the alarm, airport security is informed that this person could potentially be hiding a dangerous, metal-based weapon, such as a knife or a gun, and further research is conducted.
The latest metal detectors have multiple zones that not only sound an alarm but also can tell the security person where the metal object is located.
The multi-zone walk through metal detectors contain multiple coils that create the separate detection zone. They can detect multiple objects, and display all the areas where they can be found. Systems are available with up to 33 zones. There are alarm lights on the side of the unit making it much easier for the security person to find the object. To learn more, take a look at our video about “How Walk through Metal Detectors Work.”
Walk Through Metal Detectors are Safe and Effective
walk through metal detector.The Health Physics Society wrote a fact sheet on airport security that said, “Even though magnetic fields [created by metal detectors] are a form of radiation, the radiation the machine emits is nonionizing … [and] does not cause biological damage. Therefore, even repeated exposure to metal detectors has no associated radiation risk.” With this in mind, airport metal detectors provide a very effective and safe method of enforcing security in airports, schools, and businesses.
Walk through metal detectors are based on pulse induction (PI) technology. PI systems use a coil of wire on one side of the arch as the transmitter and receiver. This technology sends powerful, short bursts (pulses) of current through the coil of wire. Each pulse generates a brief magnetic field.
Walk Through Metal Detectors are normally associated with the security searches we encounter at airports. They will detect metallic objects on people passing through the detector, such as knives, weapons etc. Their level of detection sensitivity can be adjusted to meet varying threats.chose the best walk through metal detector to detect metals.
walk through metal detector Specifications
|Power Supply:||AC90V-250V , 50HZ/60HZ|
|Dimensions:||2200mm (H) ‘800mm (in width) ‘500mm (deep)|
|Channel dimensions:||2010mm (H) ‘700mm (W) ‘500mm (D)|
|Color:||black, charcoal gray or other customers custom color|
|Operating environment:||-20 ° C-+45 ° C|
|Standard:||GB15210-2003 national standard through metal detector door general technical specifications.|