Calibration method and device based on single-wavelength dual-laser tube phase measurement

Abstract

The method comprises the following steps: the high frequency modulation signal is generated by the laser automatic power control circuit to generate the external optical path and is transmitted to the measured target, and the outer optical path is reflected by the target object to be measured and the method comprises the following steps: (S1); the high frequency modulated signal is generated by the laser automatic power control circuit to generate the inner optical path and is sent directly to the photoelectric receiving circuit to be received (S2); the photoelectric receiving circuit will receive the optical path and the inner optical path The road light wave is phase-compared with the reference phase signal to calculate the distance phase and output the signal to cancel the substrate (S3). This method realizes the compensation and calibration of the phase error, reduces the influence of the environmental factors on the ranging error, improves the measurement accuracy of the laser ranging, and increases the stability of the system.

Description

technical field [0001] The invention relates to the technical field of photoelectric distance measurement, in particular to a calibration method based on phase measurement of single-wavelength dual laser tubes and a device thereof. Background technique [0002] Laser has always been an invention that human beings are proud of. It has the characteristics of precision, quickness, convenience, and strong anti-interference. The laser technology developed from this has solved many technical obstacles that traditional technologies cannot solve. The laser rangefinder, which is a collection of electronic technologies, has received more and more attention from civil, military and industrial industries in the fields of length, height, distance, speed, and shape. It has been widely used in the following fields abroad: major industrial and mining Enterprises, power petrochemical, water conservancy, communication, environment, construction, address, police, fire protection, blasting, nav...

AI Technical Summary

Problems solved by technology

[0010] 1) In the prior art, a light wave emitting device is used to generate one light wave, and it is necessary to use a light speed conversion device to change the light path to obtain two paths of light, inner and outer. Multiple conversions of the light beam conversion device will generate mechanical loads, and mechanical wear is inevitable, and The circuit has a long response time, and the addition of a beam conversion device will inevitably lead to complex circuits, large volume, and high cost

[0011] 2) In the prior art, one light wave emitting device is used to generate one light wave, and two light waves inside and outside need to be generated simultaneously by a spectroscopic lens. Therefore, dual APD receiving devices are required to receive the light waves transmitted at the same time, because the APD wastes circuit space and costs more than this solution. More than 20%

During the implementation of this scheme, due to the different working conditions of the two LDs due to the different working hours and working environments during the working process of the dual independent laser tubes, it is impossible to eliminate the substrate signal. In addition, due to the large discreteness of the LD devices, different tubes The difference between them also directly causes a large error

[0013] Based on the above description, the existing technology cannot effectively solve the calibration of phase measurement

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