microwave motion detector

microwave motion detector

A device that generates a train of microwaves having a fixed frequency in a space that is to be protected. If an intruder enters and moves in the protected area, waves reflected off the intruder’s body will be of a slightly different frequency. This change in frequency is detected, thereby activating an alarm.
References in periodicals archive ?
Some of the things that the Geupel DeMars Correctional Systems Group installs are door-control systems, closed-circuit TV and intercom networks, fence detection systems, microwave motion detectors, fire alarms, metal detection systems, detention windows, and of course, cell doors.
More than 200 infrared and microwave motion detectors were also installed throughout the facilities.
Magnetic contacts and microwave motion detectors are particularly useful for unobtrusive intrusion detection.
Full browser ?