Large aperture telescope shaft system precision wide range continuous measurement method and device

By combining fiber optic illumination and grating diffraction technology with optical detectors, the continuity problem of large-aperture telescope rotation angle measurement was solved, low-cost and low-difficulty precise measurement was achieved, and the problem of high difficulty in multi-faceted prism processing was overcome.

CN115728039BActive Publication Date: 2025-10-21CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
View PDF 2 Cites 0 Cited by

Patent Information

Application Number
CN202211424824.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-11-14
Publication Date
2025-10-21
Estimated Expiration
2042-11-14

AI Technical Summary

Technical Problem

Existing methods cannot achieve continuous measurement of the pitch and azimuth angles of large-aperture telescopes, and the processing of multi-faceted prisms is difficult and costly.

Method used

The system uses a pitch axis light source, an azimuth axis light source, a pitch axis grating, an azimuth axis grating, a pitch axis detector, an azimuth axis detector and a data processor. The optical fiber illumination and grating diffraction technology are used to realize the divergence and imaging of the light beam, and the displacement of the light spot is calculated to measure the angle.

Benefits of technology

It enables continuous measurement with low cost and low manufacturing difficulty, and can accurately measure pitch and azimuth angles when the optical truss rotates at a small angle, thus improving measurement accuracy.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN115728039B_ABST
    Figure CN115728039B_ABST
Patent Text Reader

Abstract

The application provides a large aperture telescope shaft precision wide range continuous measurement method and device, wherein the device comprises an elevation shaft light source, an elevation shaft grating, an elevation shaft detector and a data processor; the elevation shaft light source is arranged on the elevation shaft direction of the optical truss of the large aperture telescope, and is used for emitting a measurement light beam to the elevation shaft; the elevation shaft grating is installed on the elevation shaft and rotates synchronously with the elevation shaft, and is used for receiving the measurement light beam emitted by the elevation shaft light source and diffracting a scattered light beam with uniform divergence angle; the elevation shaft detector is arranged on the propagation direction of the scattered light beam, and is used for imaging one of the scattered light beams to obtain an elevation angle image; and the data processor is used for dividing the displacement of the light spot in the elevation angle image by the distance between the elevation shaft grating and the elevation shaft detector to obtain the angle of the rotation of the elevation shaft. The application realizes the continuous measurement of the rotation of the elevation angle and the azimuth angle of the large aperture telescope in a low cost and low processing difficulty mode.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • High-precision large-aperture grating five-degree-of-freedom splicing precision measurement method

    CN106932173A

  • Laser radar system for scanning atmospheric aerosol

    CN110045392A