A study on the application of ultra-precision speed sensor to slip-free measurement

초록

Speed is an essential item for measuring the physical quantity of moving railway vehicles. A typical method of speed sensing is to use a GPS signal. However, there are various difficulties in receiving a GPS signal from a railway vehicle in a tunnel section. In this paper, an optical sensor with a distance resolution of 1.5 mm was considered to be used in railway. The non-contact optical sensor examined was a digital output capable of outputting 1,000 pulses per meter, enabling stable measurement up to 400 km/h.