The speedometer is an instrument used to measure the running speed of a vehicle.There are two kinds of commonly used velocimeters: radar velocimeter and laser velocimeter.Among them, the principle of radar velocimeter is Doppler effect;The principle of laser velocimeter is laser ranging.Type: commonly used velocimeters are mainly divided into radar velocimeter and laser velocimeter.Fixed tachometer: as its name implies, it is a tachometer that measures in a fixed position.It means to measure the speed by fixing the vehicle speed detector on the pole frame, gantry or speed measuring box, which is widely used in expressways.Portable tachometer: It refers to an instrument that can be flexibly moved to measure speed, and can be held, mounted on a tripod or carried on a vehicle. Because of its flexibility, it is used for radial speed measurement in various industries.
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