Mixed heterodyne multi-frequency anti-aliasing laser ranging device and method

Abstract

The invention relates to a mixed heterodyne multi-frequency anti-aliasing laser ranging device and a mixed heterodyne multi-frequency anti-aliasing laser ranging method, belonging to a phase laser ranging technology. The ranging device comprises a measuring ruler generating unit, a laser frequency shifting unit, an anti-aliasing measuring light path and a phase measuring unit. The ranging method comprises the following steps: step one, starting a frequency standard laser, an offset frequency locking semiconductor laser and a He-Ne laser; step two, taking a beam as a reference laser beam, and the other beam as measuring laser; step three, taking c / |v2-v3| as accurate measuring ruler length; step four, taking c / |v1-v2| as rough measuring ruler length; and step 5, moving a measuring retroreflector to a target end to respectively obtain phase difference phi 1 and phi 2 of the accurate measuring ruler and the rough measuring ruler, and finally obtaining a measured distance value through a formula. The mixed heterodyne multi-frequency anti-aliasing laser ranging device and the method provided by the invention solve the problems that ultralong wavelength and ultrashort wavelength cannot be generated simultaneously, the laser measuring ruler cannot realize direct traceability, and nonlinear periodical error and frequency aliasing are caused, and has the characteristics of high measurement efficiency, high precision, and strong stability and real-time property.

Description

technical field [0001] The invention belongs to phase laser measurement technology, and mainly relates to a phase laser distance measuring device and method. Background technique [0002] Large-scale measurement has attracted much attention in the development of large-scale precision machinery manufacturing, major scientific and technological projects, aerospace industry, shipbuilding industry and microelectronic equipment industry and other large-scale optical-mechanical-electrical integration equipment processing and manufacturing. It is an important basis for the processing and overall assembly of large parts in aerospace vehicles and giant ships. The quality of its measurement methods and equipment performance directly affect the quality of workpieces and assembly accuracy, which in turn affects the operating quality, performance and life of the entire set of equipment. The multi-ruler phase ranging method uses a group of measuring ruler wavelengths from large to small t...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to solve the problems that the ultra-long wavelength and ultra-short wavelength cannot be synchronously generated in the existing phase laser ranging technology, the laser measuring ruler cannot be directly traced to the source, and the problems of nonlinear periodic error and frequency aliasing are provided. Hybrid heterodyne multi-frequency anti-aliasing laser ranging device and method to achieve the purpose of increasing ranging flexibility, simplifying ranging steps, and improving measurement efficiency, accuracy and real-time performance

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