method of measuring the distance by the photoelectric sensor and the light transit time principle

摘要

PROBLEM TO BE SOLVED: To provide a method for measuring distance with high time accuracy in accordance with light transit time principle.;SOLUTION: A light emitting time adjusting section 20 provides a time base of high resolution based on two frequencies with a time base unit 38, and delays light emission of a light pulse with a magnification of 60.975 ps, for example. The light emitting time adjusting section 20 has a light emitting time fine-adjusting unit 40, and forms a light emitting pattern of a gauss shape, for example, using many individual measured values, and thus theoretically, optionally fragments the actually occurring light emitting time delay by the center of gravity of a light receiving pattern to which it belongs comparing with a physically enabled light emitting time. In other words, a time base unit 38 directly varies the resolution, and the resolution is further fragmented indirectly via a statistical shift of the center of gravity by the light emitting time fine-adjusting unit 40. Thus, the light pulse transmitted at time interval of high resolution is received, and is digitized by an A/D converter 36, and histogram analysis is performed by a histogram unit 42.;COPYRIGHT: (C)2010,JPO&INPIT