Novel sine arm for laser small-angle measurement device

A laser small angle, measuring device technology, applied in the field of geometric quantity measurement, can solve the problems of low efficiency, high price, inconvenient installation and adjustment of the split structure, etc., to reduce sensitivity, reduce error sources, and improve the system. Effects of Resolution and Measurement Accuracy

Active Publication Date: 2012-06-20
BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This set of devices is relatively expensive, and the split structure is inconvenient to use and the efficiency is not high

Method used

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  • Novel sine arm for laser small-angle measurement device
  • Novel sine arm for laser small-angle measurement device
  • Novel sine arm for laser small-angle measurement device

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Embodiment Construction

[0023] A new type of sinusoidal arm used in the laser small-angle measuring device according to the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0024] Such as Figure 2 to Figure 4 As shown, the shape of the sinusoidal arm 1 of the present invention is a cuboid, with the center of the sinusoidal arm 1 as the center of symmetry, two square grooves 3 are opened at the symmetrical positions of both ends of the sinusoidal arm 1, and the two square grooves 3 are Hollow corner cube mounting holes 2 are provided at the bottom, and the distance between the centers of the two hollow corner cube mounting holes 2 is the length of the optical arm of the sinusoidal arm; the two hollow corner cubes are respectively fixed in the hollow corners in the two square grooves 3 Prism mounting hole 2. The inner walls of the two square grooves 3 are evenly distributed along the circumference with three lug-type protrusio...

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Abstract

The invention provides a novel sine arm for a laser small-angle measurement device. Two squared grooves are arranged at symmetric positions of two end parts of the sine arm, and hollow corner prisms are arranged at the bottom in the two squared grooves; the two hollow corner prisms are respectively and fixedly arranged on hollow corner prism mounting holes; the central area of the sine arm is in a solid structure and the back sides of the two sides of the central area are symmetrically provided with two squared grooves with inclined ribs; each hollow corner prism is formed by splicing three triangular reflecting mirrors which are of right angled isosceles triangles; vertexes of the three triangular reflecting mirrors are opposite and working surfaces of the three triangular reflecting mirrors are inwards placed; and any two of the three triangular reflecting mirrors are vertical with each other. By applying the sine arm to the laser small-angle measurement device, the flexibility of the device can be improved, the sensibility to the environmental change is reduced, and an error source for influencing the measurement accuracy of the system is reduced, so that the measurement precision and the stability of the laser small-angle measurement device are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of geometric quantity measurement, and in particular relates to a sine arm mechanism for a laser small-angle measuring device. Background technique [0002] The laser small angle measuring device is a high-precision instrument that uses the sine principle to measure small angles by Michelson interferometry. figure 1 The angle measurement principle of the laser small angle measuring device shown. The sine arm is the core component. The sinusoidal arm is composed of a metal frame and corner cubes installed on both sides of the frame, and the distance between the centers of the two corner cubes constitutes the arm length of the sinusoidal arm. In the laser interferometry system, due to the sinusoidal relationship sinθ=H / D between the optical path difference H of the interference optical path and the length D of the sinusoidal arm caused by the rotation of the sinusoidal arm, the angle θ of the rotation of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/26
Inventor 刘勇梁雅军孙方金
Owner BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH
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