Phase distance measuring device and method based on laser heterodyne detection

A technology of phase ranging and laser heterodyne, which is applied in the phase ranging device based on laser heterodyne detection, and the phase ranging based on laser heterodyne detection, can solve the problem of uneven phase of the light intensity change detector, and achieve The effect of non-uniformity error reduction, phase error avoidance, and phase fluctuation reduction

Active Publication Date: 2019-12-20
WUZHOU UNIV
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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-

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  • Phase distance measuring device and method based on laser heterodyne detection
  • Phase distance measuring device and method based on laser heterodyne detection
  • Phase distance measuring device and method based on laser heterodyne detection

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Embodiment Construction

[0022] The technical solutions of the present invention will be further described in detail below in conjunction with specific embodiments, but this does not constitute any limitation to the present invention.

[0023] refer to Figures 1 to 3 As shown, a phase ranging device based on laser heterodyne detection of the present invention includes an infrared fiber laser 1, a first fiber coupler 2, a first electro-optic intensity modulator 3, a second electro-optic intensity modulator 4, Telescope 8, fiber collimator 10, second fiber coupler 11, A / D acquisition circuit 14 and computer 15, the optical path output end of described infrared fiber laser 1 is connected with the optical path input end of the first optical fiber coupler 2, so The two optical path output ends of the first optical fiber coupler 2 are respectively connected to the optical path input ends of the first electro-optic intensity modulator 3 and the optical path input ends of the second electro-optic intensity m...

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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...

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Application Information

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IPC IPC(8): G01S17/08
CPCG01S17/08
Inventor 刘玉周冯静
Owner WUZHOU UNIV
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