infrared motion detector การใช้

One end is the infrared motion detector, which screens in a radius of 16 feet in front of the device.
The computer room is also boobytrapped so the slightest sound will set off the alarms . ( Did the CIA consider a cheap infrared motion detector?
Also, 200 infrared motion detectors have been mounted and a microwave link system is wired to the museum's enclosure walls and gates to guard against break-ins.
For years, the perimeter of the White House grounds has been protected by an array of infrared motion detectors, seismic sensors buried in the lawn, surveillance cameras, guards posted in bullet-proof guard houses and on roof tops.
The detection devices that picked up the latest intrusion at the White House are part of a layered network of security that includes infrared motion detectors, seismic sensors buried in the lawn, surveillance cameras, guards posted in bullet-proof guard houses, on roof tops and inside the White House complex itself.