What does WTMD mean in UNCLASSIFIED

Walk Through Metal Detection (WTMD) is a security device that uses electromagnetic fields to detect metal objects that could be used as weapons. The WTMD system consists of two or more antennae suspended between two vertical posts, allowing a person to walk through the detection zone in order to be scanned for any hidden metal objects.

WTMD systems use Electromagnetic technology to detect metal objects by creating an electromagnetic field and then detecting the disturbance created when metal passes through it. As a person enters the detection zone, the system scans them with short bursts of radio waves, which bounce off metallic objects and return to the base station, alerting security personnel if any suspicious items are detected.

Generally, WTMD systems can detect ferrous (easily magnetized) metals such as iron, steel and aluminum. Items made from non-ferrous metals such as bronze or copper may not be detected by these systems. Additionally, some WTMD systems may have difficulty detecting thin items like razor blades or small jewelry pieces.

WTMDs are commonly used in high-security environments such as airports, government buildings and military bases where screening of personnel is necessary for safety and security reasons. Additionally, these systems can be used in prisons and other high-risk areas where detection of weapons or contraband is necessary.

Some of the major advantages of using WTMDs include their ability to detect hidden metal objects quickly and easily; their ability to scan large numbers of people in a short period of time; their low cost compared to other security solutions; and their flexibility with regards to placement within an area (i.e., they do not require dedicated space). Their accuracy also plays a major role in ensuring efficient security screening processes while minimizing false alarms caused by harmless items such as coins or jewelry.

Most experts agree that the radio waves used in WTMDs pose minimal risks to human health due to their relatively low intensity levels and brief exposure times during each scan cycle. However, pregnant women should seek medical advice before passing through a WTMD scanner due to its unknown effects on unborn children over long exposure periods (which are nonexistent during normal operation).

Depending on usage levels and local conditions (such as climate), calibration should typically be done at least once per month for optimal accuracy. It's important to make sure that your system remains properly calibrated so that it is able to accurately identify potential threats without raising unnecessary alarms due to harmless items passing through it unnoticed by security personnel.