Laser ranging system, method and device

Abstract

The invention relates to distance detection, in particular to a laser ranging system, method and device. The invention discloses a laser ranging system, and the system comprises a transmitting module which is provided with a first transmitting end for transmitting first laser and a second transmitting end for transmitting second laser; the receiving module is used for receiving reflected laser of the first laser and the second laser and synchronously recording first receiving time when the reflected laser is received and second receiving time when the second laser is received; and the processing module is used for calculating the path distance according to the time difference between the first receiving time and the second receiving time. A receiving module is used for receiving the reflected laser and the second laser at the same time, the change value of propagation time generated by photoelectric conversion, amplification collection and the like due to different temperatures can be ignored, propagation delay and time change caused by the temperatures are eliminated, and then the drift error of the propagation time in the system in the distance measurement process is eliminated.

Description

technical field [0001] The present invention relates to distance detection, and in particular, to a laser ranging system, method and device. Background technique [0002] Pulse laser ranging is based on the Time of Flight method to measure the flight time of the laser pulse, and then calculate the distance according to the speed of light. Because to calculate the travel time of the laser pulse from being emitted to the light returning from the object to be received, to obtain a high-precision distance, a high-precision time measurement system must be measured. Now mainstream products mainly record the start and end time in two ways. One is to use the electrical pulse signal when the laser is emitted as the start signal, and the optical signal returned by the object to be used as the end signal for timing; the other is to use part of the outgoing laser. As the start signal, the object returns the light signal as the end signal for timing. In the first method, there is a cer...

AI Technical Summary

Problems solved by technology

This method has two defects. One is that the initial optical signal and the optical signal returned by the object are measured by different photoelectric conversion systems, and there are different temperature delay drifts in the hardware part, resulting in timing errors; Not very stable, there will be certain changes, resulting in timing errors

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