Phase distance measuring device and method based on laser heterodyne detection

Abstract

The invention discloses a phase distance measuring device based on laser heterodyne detection. The phase distance measuring device comprises an infrared optical fiber laser device, a first optical fiber coupler, a first electro-optical intensity modulator, a second electro-optical intensity modulator, a telescope, an optical fiber collimator, a second optical fiber coupler, an A / D acquisition circuit and a computer, and further comprises a signal generation circuit is used for generating an intermediate-frequency sinusoidal signal and an ultrahigh-frequency sinusoidal signal, a first automaticgain control circuit, a second automatic gain control circuit, a photoelectric detector and a photoelectric detection conversion circuit. The phase distance measuring device can effectively solve theproblem of phase fluctuation caused by light intensity change and detector phase nonuniformity in distance measurement by adopting an ultrahigh frequency modulation phase method, and has the advantage of high measurement precision. The invention further discloses a phase ranging method based on laser heterodyne detection.

Description

technical field [0001] The present invention relates to laser ranging technology, more specifically, to a phase ranging device based on laser heterodyne detection; the present invention also relates to a phase ranging method based on laser heterodyne detection. Background technique [0002] Laser phase ranging is suitable for absolute measurement of short and medium distances, and has been widely used in many fields. However, the millimeter-level accuracy of traditional phase ranging can no longer meet the needs of applications such as giant manufacturing and three-dimensional accurate identification of targets. Improving the frequency of the laser modulation signal is the most effective means to improve the accuracy of distance measurement, but when the modulation frequency is increased to above the gigahertz level, the phase fluctuation caused by the change of light intensity irradiated on the detector of ultra-high frequency detection and the photoelectric detection The p...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a phase distance measuring device based on laser heterodyne detection, which can effectively solve the problem of distance measurement in ultra-high frequency modulation phase method , due to the phase fluctuation problem caused by light intensity changes and detector phase inhomogeneity, it has the characteristics of high measurement accuracy

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