Optical calibration device for reflecting telescope optical axis monitoring based on polarization and beam splitting

Abstract

The invention discloses an optical calibration device for reflecting telescope optical axis monitoring based on polarization and beam splitting. The device comprises an optical fiber light source, a collimating lens, a beam splitting prism, a polarization and beam splitting prism, a first parallel flat plate, a quarter-wave plate, a pyramid prism, a second parallel flat plate, a converging lens and a detector. In the optical calibration process of a telescope system, the polarization and beam splitting prism, the quarter-wave plate and the pyramid prism are adopted to generate two beams whichare collinear in opposite directions, and high-precision registration of the optical axis of the optically calibrated telescope system and the normal of an auxiliary standard plane mirror is realized.The device is used for a relative test and overcomes test precision problems brought by manual interpretation errors, a test environment and the like in a traditional optical axis absolute test. Besides, the reference optical axis and the test optical axis share the same optical path, the influence of vibration in the testing process is avoided, and therefore test efficiency and optical calibration efficiency are greatly improved.

Description

technical field [0001] The invention belongs to the field of optical testing and optical adjustment, and relates to an optical calibration device for monitoring the optical axis of a reflective telescope based on polarization splitting, and is especially suitable for optical calibration of a reflective telescope system. Registration and real-time monitoring of plane mirror normals. It is also suitable for large-diameter aspheric mirror processing, laser emission and reception registration and other fields. Background technique [0002] Reflective space optical camera loads such as laser radar and laser altimeter have higher and higher requirements for the optical axis pointing of the reflective telescope system in the optical load. Point-to-point testing requires higher and higher registration accuracy. In the optical assembly process, the most important thing is to collinearly register the optical axis of the space reflective telescope system to be optically corrected and...

AI Technical Summary

Problems solved by technology

There are two traditional schemes: first, during the processing of the primary mirror of the telescope, the perpendicularity between the optical axis of the primary mirror and the back of the primary mirror is strictly controlled, and the normal line of the back of the primary mirror is adjusted when optically calibrating the reflective telescope system. It is collinear with the normal line of the auxiliary large-aperture plane mirror as the optical axis registration. This method depends on processing and has low precision, and it is difficult to give accurate optical axis orientation

The second method is to use the theodolite to align the optical axis of the telescope system, then rotate the theodolite 180°, and adjust the auxiliary large-caliber standard plane mirror so that the normal line coincides with the optical axis of the theodolite, so that establishing a benchmark will introduce various errors, and the fixation of the theodolite Error, the zero position error of adjusting the theodolite level, the rotation error introduced by the rotating theodolite, etc., the process is cumbersome, the repeatability is not high, and it is difficult to realize the real-time monitoring of the optical axis during the optical calibration process

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