The digital security walk-through metal detector is a device that detects the presence of metallic objects on a person's body. It works by sending electromagnetic waves through the body and measuring the reflection of these waves. If the object has a large enough mass, then it reflects more energy than usual and can be detected.
The security walk-through metal detector (SWMD) is used in many industries, such as airports, government,bank, buildings and other public areas where security is important. It can detect weapons such as knives or guns, but it cannot detect plastic explosives or liquids such as water bottles. The SWMD detects objects that are less than 2 inches thick and weigh less than 8 ounces (0.2 kg).
There are two types of SWMDs: active (powered) and passive (unpowered). Active SWMDs use an internal power source to generate electromagnetic waves while passive SWMDs do not have an internal power source and must be plugged into an external power supply to operate properly.
Digital security walk through metal detectors are the most common type of security system used in airports, schools, and other public spaces. These systems use a magnetometer to detect any ferromagnetic objects on a person's body, such as weapons or other dangerous items.
Passive Millimeter Wave (PAS) - These use low frequency radio waves to detect objects hidden under clothing. They are commonly used in prisons and courtrooms.
Active Millimeter Wave (AAS) - These use high frequency radio waves to detect objects hidden under clothing. They have better detection capabilities than passive millimeter wave detectors but cannot be used in areas where there are people who may be injured by the radiation emitted by these systems. Active millimeter wave detectors also require specialized training for operators and maintenance staff because they can cause temporary or permanent damage if handled improperly.
X-Ray - These systems use ionizing radiation to penetrate clothing and identify concealed items such as weapons or drugs without requiring an operator to physically touch them first; however this method has been banned at many airports due to concerns about the safety of passengers who might be exposed to excessive amounts of radiation during an extended stay at an airport
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