Frequency-modulation continuous-wave laser distance measuring device of integrated reference optical-circuit stabilization system

Abstract

The invention discloses a frequency-modulation continuous-wave laser distance measuring device of an integrated reference optical-circuit stabilization system. Distance measuring baselines of currentfrequency-modulation continuous-wave laser distance measuring systems are easily influenced by external vibration, and then the distance measuring accuracy is influenced. The frequency-modulation continuous-wave laser distance measuring device of the integrated reference optical-circuit stabilization system includes an external-cavity tunable laser, a measurement interference system, a helium-neonlaser and an auxiliary interference system; the external-cavity tunable laser generates continuous lasers of 1540 nm-1550 nm; the helium-neon laser generates single-mode lasers of 632 nm; the measurement interference system includes a second coupler, a first circulator, a first collimating lens, a first photoelectric detector and a third coupler; a feedback control system for optical-path-difference compensation is arranged in the auxiliary interference system and includes an acousto-optic modulation device, a frequency-modulation signal source, a phase detector, a photoelectric detector, a piezoelectric micro platform, a piezoelectric controller, a servo controller and a plane mirror. The frequency-modulation continuous-wave laser distance measuring device of the integrated reference optical-circuit stabilization system is used for eliminating the influence that the lengths of delay optical fibers change due to the external vibration, and therefore the distance measuring accuracy isimproved.

Description

technical field [0001] The invention belongs to the field of optical technology, and in particular relates to a frequency-modulated continuous-wave laser ranging device integrating a reference optical path stabilization system. Background technique [0002] In the field of large-scale precision measurement, measuring instruments based on laser technology are widely used. Absolute ranging technology with a range of more than ten meters to tens of meters is currently a research hotspot and difficulty in the field of laser measurement. Frequency-modulated continuous wave laser ranging has the advantages of high precision, no blind zone, no need for cooperative targets, and absolute distance measurement. It is especially suitable for industrial large-scale absolute ranging. [0003] The optical fiber Mach-Zehnder interferometry system is added as an auxiliary interferometric system in the frequency-modulated continuous wave ranging system, and the resampling method with equal o...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings and shortcomings of the existing frequency modulation continuous wave laser ranging system that the ranging reference is easily affected by external vibrations, and to provide a frequency modulation continuous wave laser ranging device with an integrated reference optical path stabilization system

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