Calibration method for phase measurement, device and distance measuring apparatus

Abstract

The invention is applied to the field of electro optical distance measurement and provides a calibration method for phase measurement, a device and a distance measuring apparatus. The method comprisesthe following steps: a first lightwave emission device emits a first lightwave to a measured object, the first lightwave is reflected by the measured object and received by a receiving device, and the lightwave acting as an outer light path signal is generated by modulating a first high-frequency oscillator signal; a second lightwave emission device emits a second lightwave to the receiving device, and the lightwave acting as a substrate reference of an inner light path signal is generated by modulating a second high-frequency oscillator signal; and the receiving device carries out phase comparison of the two paths of lightwaves received one after the other and outputs signals with substrate elimination. The invention realizes phase compensation and calibration and avoids inducing uncertain phase noise to circuits because of environment variation, thereby improving the measurement precision of laser ranging, reducing the effect of environment factor to ranging error, reducing the costof a system and enhancing the application of laser ranging to various industries.

Description

technical field [0001] The invention belongs to the field of photoelectric distance measurement, and in particular relates to a phase measurement calibration method, device and distance measurement equipment. Background technique [0002] With the rapid development of semiconductor lasers and digital circuits since the 1980s, long-distance and high-precision laser ranging technology has become more and more widely used in electric power, water conservancy, communications, environment, construction, police, fire protection, blasting, and navigation. In fields such as railways, military anti-terrorism, etc., phase laser ranging products with millimeter-level measurement accuracy have gradually become dominant in short-range laser ranging within 200 meters. The laser distance measuring device based on the principle of phase difference measurement uses a modulated laser beam to irradiate the measured target. The beam is reflected by the measured target and then turned back. The ...

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Problems solved by technology

[0012] The purpose of the embodiments of the present invention is to provide a calibration method for phase measurement, aiming to solve the problems in the prior art that the circuit has a long response time, is prone to mechanical failure, has a short service life or high cost, and is prone to co-channel interference.

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