Superheterodyne and heterodyne anti-aliasing laser ranging device and method

Abstract

The invention discloses a superheterodyne and heterodyne combined type optical-aliasing-resistance laser ranging device and method, and belongs to the technical field of phase laser ranging. The device comprises a measuring ruler generating unit, a laser frequency shift unit, an expanded beam collimation lens set, a measuring optical path and a circuit unit. The method includes the steps of firstly, starting a frequency standard laser device, a semiconductor laser device and a frequency-stable He-Ne laser device; secondly, regarding one beam as a reference laser beam, and regarding the other beam as a measuring laser beam; thirdly, regarding the formula (please see the formula in the specification) as an accurately-measuring ruler; fourthly, regarding the formula (please see the formula in the specification) as a roughly-measuring ruler; fifthly, moving a measuring cube-corner retro-reflector to a target end, obtaining the phase difference phi1 of the accurately-measuring ruler and the phase difference phi2 of the roughly-measuring ruler, and finally obtaining a measured distance value through the formulas. The device and method solve problems that ultra-long waves and ultra-short waves can not be synchronously generated, the laser measuring rulers can not directly trace to the source and the nonlinear periodic error and frequency aliasing exist, and has the advantages of being high in measuring efficiency, accuracy, stability and instantaneity.

Description

Technical field [0001] The invention belongs to the phase laser measurement technology, and mainly relates to a phase laser ranging 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 engineering, aerospace industry, shipbuilding industry, and microelectronics equipment industry and other large-scale opto-mechanical integration equipment processing and manufacturing. Among them, large-scale measurement ranging from several meters to several hundred meters It is an important foundation for the processing and overall assembly of large parts and components in aerospace vehicles and giant ships. The quality of measurement methods and equipment performance directly affect the quality of the workpiece and the accuracy of assembly, and then affect the operating quality, performance and life of the entire set of equipment. The multi-rul...

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Problems solved by technology

[0012] 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. Super-heterodyne and heterodyne-combined anti-optical aliasing laser ranging device and method to achieve the purpose of increasing the flexibility of ranging, simplifying the steps of ranging, and improving measurement efficiency, accuracy and real-time performance

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