Light wave range finder

TL;DR: In this article, the authors proposed a light wave range finder capable of efficiently creating a signal necessary for measurement and capable of performing the measurement in a short time, which includes: a light emission element 11 for emitting a range finding light 28; signal generators 33, 34 for generating a plurality of proximity frequencies; intermittent pulse generators 35, 36 for producing a pulsed modulation signal in a prescribed width; an emission optical system for sequentially switching and emitting an intermittent modulation range-finding light for each proximity frequency; a light reception part 21 for receiving a reflected distance measuring light 28';

Abstract: PROBLEM TO BE SOLVED: To provide a light wave range finder capable of efficiently creating a signal necessary for measurement and capable of performing the measurement in a short timeSOLUTION: A light wave range finder includes: a light emission element 11 for emitting a range finding light 28; signal generators 33, 34 for generating a plurality of proximity frequencies; intermittent pulse generators 35, 36 for generating a pulsed modulation signal in a prescribed width; an emission optical system for sequentially switching and emitting an intermittent modulation range finding light for each proximity frequency; a light reception part 21 for receiving a reflected distance measuring light 28'; the other signal generators 55, 56 for generating a frequency signal having a difference of the predetermined frequency; frequency conversion parts 39, 43, 44, 57, and 58 for converting the frequencies into difference frequencies by mixing; and a calculation control part 52 The calculation control part intermittently generates respective proximity frequencies so that the pulse width of the intermittent modulation distance measuring light is made shorter than the cycle of the difference frequency A difference frequency waveform is calculated A phase is obtained from the waveform for one cycle of the difference frequency, a precise measuring distance is calculated, a mutual phase difference of the difference frequency waves is calculated, a rough measuring distance value is calculated, and the distance is measured from the rough measuring distance value and the precise measuring distance valueSELECTED DRAWING: Figure 2