Radar detector detectors - A radar detector is an electronic device used by motorists to determine if their speed is being monitored. The term originates from early speed-detection technologies, in which police bounced a radio wave off a moving vehicle with a device that determined the vehicle's speed by the Doppler-effect-moderated change in the wave's frequency. Most of today's radar detectors detect signals across a variety of wavelength bands - usually X, K, and Ka bands (and Ku, in Europe). Newer speed-detection technology uses pulsed laser light (LIDAR, commonly referred to as laser detection) rather than radio waves. Modern "radar detectors" have been adapted to suit that technology, by detecting the infrared light emitted by these new detection methods. LIDAR detection is not nearly as reliable as the detection of radar, since the light is much more focused and often aimed below the windscreen level, where the detector is usually mounted. (The reflective coating of the vehicle licence plate is an excellent laser beam reflector.)
Metal Detectors and Metal Detecting > Radar detector detectors > How Radar Detectors Work

options Details of "How Radar Detectors Work"
URL: http://auto.howstuffworks.com/radar-detector.htm
Date Submitted: 01/08/06
Description: If you have a lead foot, you may have invested in a radar detector. Find out how these devices pick up police radar and lidar and learn what a jamming signal does.
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