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Gunn diode
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=== Sensors and measuring instruments === Gunn diode oscillators generate microwave power for:<ref>''The Gunn effect'', University of Oklahoma, Department of Physics and Astronomy, course notes.[http://www.nhn.ou.edu/~johnson/Education/Juniorlab/Microwave/Gunn%20Effect.pdf]</ref> [[Airborne collision avoidance system|airborne collision avoidance radar]], [[Anti-lock braking system|anti-lock brakes]], sensors for monitoring the flow of traffic, [[Radar detector|car radar detectors]], pedestrian safety systems, "distance travelled" recorders, [[motion detectors]], "slow-speed" sensors (to detect pedestrian and traffic movement up to 85 km/h (50 mph)), traffic signal controllers, automatic door openers, automatic traffic gates, process control equipment to monitor throughput, burglar alarms and equipment to detect trespassers, sensors to avoid derailment of trains, remote vibration detectors, rotational speed tachometers, moisture content monitors.
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