Patent ID: 6759644
Filing Date: 2004-07-06
Classification: G01J,G01S

Abstract:
A sensor using radiation pulses, said sensor comprising:an emitting device for emitting radiation pulses repeatedly; and a receiving device for receiving said radiation pulses, said receiving device including converting means having an output line for converting the received radiation pulses into electrical pulses; said receiving device including pulse judging means for judging whether an electrical pulse appearing on said output line of said converting means is a true electrical pulse caused by receiving the radiation pulses emitted from said emitting device or a false electrical pulse caused by noise on the basis of a known waveform characteristic of said true electrical pulse; said receiving device generating an output signal on the basis of result of judging by said pulse judging means; and said known waveform characteristic comprising standard values on the waveform of said true electrical pulse at two or more standard times.