Laser scannning and tracking instrument with six feedom measurement function

Abstract

The laser scan tracker with six-freedom measurement function comprises double-frequency laser interferometer, two-D position sensitive detection device, spectroscope, two-D rotation plane mirror and coordinate bearing measuring target. Its coordinate bearing measuring target comdprises main shaft, axial plane rotating mechsniam in upper end of the main shaft and equipped with corner cube, main shaft circumagitating mechanism positioned in middle portion of main shaft and equipped with photoelectric measuring head or hollow tetrahedron measuring head and positioing mechanism which is positioned in lower end of main shaft and is composed of measuring bar and contact ball. The outer end of rotation arm is equipped with corner cube, said rotation is controlled by positioing plate.

Description

technical field [0001] The invention relates to a laser scanning tracker with a six-degree-of-freedom measurement function. It belongs to the innovative technology of laser scanning tracker. Background technique [0002] The existing three-dimensional laser scanning tracker is a high-precision (±20ppm during dynamic measurement), high-resolution (distance measurement accuracy is 0.1μm, angle measurement accuracy is 0.25arc-sec.), large range (25m), Intelligent dynamic measuring instrument, its working principle is as follows: figure 1 shown. The measurement beam emitted by the HP dual-frequency laser interferometer 1 is incident on the two-dimensional rotating plane mirror 4 through the beam splitter 3, and the parallel beam reflected by the plane mirror 4 hits the center of the corner cube 5 and is reflected back to the The beam splitter 3 irradiates the returned beam onto the two-dimensional position sensitive detection device (PSD) 2 . When...

AI Technical Summary

Problems solved by technology

However, the direct application of the above-mentioned three-dimensional measuring device cannot realize the determination of the coordinate orientation of the tracked object (such as the measurement of the azimuth angle of the central axis of the hole, the measurement of the center distance between the holes, etc.), nor can it realize the distance measurement between the space points (such as aiming and measuring the distance between the intersection of two spatial crosshairs, etc.)

The reason is that the function of the corner cube is only to return the incident light along the original direction, and when the corner cube rotates around the incident light with an azimuth angle, the direction of the reflected light remains unchanged, so the azimuth around the incident light cannot be measured Change, that is, the measurement of three-dimensional azimuth angle cannot be realized

And because the corner cube itself does not have the sub-coordinate system function, it cannot carry the point aiming probe, so the distance measurement between spatial points cannot be realized

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