Laser measurement device capable of performing measurement function switching during measurement as well as test method

Abstract

The invention discloses a laser measurement device capable of performing measurement function switching during measurement. The laser measurement device comprises a thermal frequency stabilization He-Ne laser (1), a measuring unit (16) and a signal processing system, lights emitted from the thermal frequency stabilization He-Ne laser (1) pass the measuring unit (16) and then are sent to the signalprocessing system, processing is performed, and a measurement result is obtained. The laser measurement device is characterized in that the measuring unit (16) comprises a reflecting mirror (24) anda light shielding plate (23) which can be changed in position; when an interference measurement function is used, a light beam returned by a target lens (4) is reflected via the reflecting mirror (24)and then passes a polarizer (5) and an avalanche transistor (6); when an absolute distance measurement function is used, the reflecting mirror (24) is changed in position and is not located on a light path of the light beam returned by the target lens (4), the light beam returned by the target lens (4) passes a polarizer (11) and is received by an avalanche transistor (12), the light shielding plate (23) is changed in position and is located between a polarizing beam splitter (8) and a pyramidal prism (10), and a light path of a light beam transmitted from the polarizing beam splitter (8) isshielded.

Description

technical field [0001] The invention relates to the technical field of laser distance measurement, in particular to a laser measurement device and a test method capable of converting the functions of absolute distance measurement and interferometric measurement during measurement. Background technique [0002] There are currently two methods of practical application for the precise measurement of the length and contour shape of large-scale manufactured parts: ①The absolute distance measurement method introduced in Li Guangyun's "Surveying and Mapping Bulletin" 1998. (10) "The latest development of industrial three-dimensional coordinate measurement system" : The industrial photoelectric measurement system composed of electronic theodolite, total station, digital camera, etc. as sensors can measure the measured distance at one time. It is characterized by mature technology, low cost, and low requirements for the use environment; but the accuracy is generally not high. The poi...

AI Technical Summary

Problems solved by technology

It is characterized by high precision, and can be combined with tracking technology to directly and quickly measure the profile shape of the tested part, but the target mirror must be continuously moved from the measurement starting point to the end point during measurement, and the beam is not allowed to be blocked in the middle (otherwise it can only start from the beginning), and the moving The speed of the target mirror should not be too fast (otherwise the tracking system will be lost, and you can only start from the beginning), the operation requirements and requirements for the use environment are high, and the cost is also high

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