Security Detectors
Security detectors rely on different technologies to achieve their high levels of accuracy. The most common is Pulse Induction (PI), which sends short, powerful pulses of current through a coil. When a metal object is present, the pulses are reflected back, causing a "spike" in the signal. Another common technology is Very Low Frequency (VLF), which uses a transmitter coil and a receiver coil to create and detect a magnetic field disruption.
A key feature of modern security detectors is multi-zone detection, which allows the device to identify the location of the metal object on the body (e.g., left ankle, right hip). This speeds up the screening process and makes it more efficient. Another important feature is adjustable sensitivity, which allows operators to fine-tune the detector to the specific security needs of the location.
Frequently Asked Questions
Security detectors are designed to find all types of metal and are typically calibrated for high sensitivity to detect weapons. Gold detectors, on the other hand, are optimized to discriminate against junk metal and focus on specific metallic signatures, like those of gold and other precious metals.
Yes, most security metal detectors are sensitive enough to detect cell phones, which contain metallic components. Their ability to do so depends on the sensitivity settings of the device and the size of the phone.
Multi-zone detectors use a grid of overlapping electromagnetic fields. When a metal object passes through, the detector can pinpoint which specific field (or zone) was disrupted, indicating the general location of the item on the person being screened.
Some advanced security detectors, such as millimeter-wave body scanners, can detect non-metallic objects by creating a detailed image of a person's body and revealing objects hidden under clothing, regardless of their material.
Modern security metal detectors are generally considered safe for individuals with pacemakers. The electromagnetic fields they produce are low-frequency and low-intensity. However, if you have a medical device, it's always best to inform the security personnel and request an alternative screening method.
