Device for detecting large-sized perspective glass primary and secondary mirror spacing

Abstract

An apparatus for detecting spacing between a primary mirror and a secondary mirror, which comprises an auto-collimator, a pentaprism, a guide rail, a reticle, a CCD detection system and a monitoring computer, wherein the guide rail is arranged in parallel direction of vertical diameter of the primary mirror, the pentaprism is arranged at the guide rail and can be translated along the vertical direction, parallel rays emitted from the auto-collimator is turned 90 degrees via the pentaprism and then via telescope optical system to converge at primary optical axis, the reticle is arranged at Cassegrain focus, the CCD detection system is employed for image-forming of the parallel rays convergent point and the reticle, the monitoring computer is capable of calculating the centre of mass of the images detected by CCD detection system and obtaining a group of image points position, while another group of image points position can be obtained by moving the pentaprism, radial scanning of the primary mirror can be achieved by continue moving, and a movement path of the centre of mass of image points can be obtained, thereby spacing error between the primary mirror and the secondary mirror is obtained via processing of the monitoring computer. The apparatus achieves auto-detecting of the spacing between the primary mirror and the secondary mirror of the telescope, increasing the detecting accuracy, thereby providing important guarantee for later system adjusting of large telescope.

Description

technical field [0001] The invention belongs to the detection technology research field in the later stage of telescope development, and relates to a device for detecting the distance between primary and secondary mirrors of a large telescope. Background technique [0002] The light-gathering ability of the telescope increases with the increase of the aperture. The stronger the light-gathering ability of the telescope, the fainter and farther celestial objects can be seen. This is actually the ability to see the earlier universe. The development of astrophysics requires telescopes with larger apertures. However, with the increase of the aperture of the telescope, a series of technical problems follow one after another, one of which is the detection of the adjustment error of the large-aperture optical system. [0003] The detection of alignment errors of large-aperture optical systems is often costly and has low spatial resolution. The scheme of detecting large-aperture le...

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Problems solved by technology

[0003] The detection of adjustment errors of large-apertu...

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