Cassegrain telescope adjustment mechanism and adjustment method

Abstract

The invention discloses a Cassegrain telescope adjustment mechanism and adjustment method, and the mechanism comprises a laser which is used for emitting a light beam to a primary mirror of a Cassegrain telescope, a rotating mechanism which is used for driving the laser to rotate around the optical axis of the primary mirror, and a light receiving part which is vertically disposed on the optical axis of the primary mirror. The optical axis of emergent light of the laser is parallel to the optical axis of the primary mirror, and the light receiving part can move in the direction of the opticalaxis of the primary mirror. When the Cassegrain telescope is adjusted, the optical axis of laser emitted by the laser emitter is parallel to the optical axis of the primary mirror, one end of the backsurface of the primary mirror is provided with a group of light receiving parts, a rotary laser and a movable light receiving part, and the change of the circle center and the diameter of a circle formed by a plurality of projection points on the light receiving parts at different positions is compared. The distance and the inclination angle between the primary mirror and the secondary mirror areadjusted, the influence of spherical aberration, coma, defocusing and other aberrations is reduced, and the measuring equipment is simple in structure, does not need to use an interferometer and is convenient to operate.

Description

technical field [0001] The invention relates to the field of optical imaging detection, in particular to a Cassegrain telescope assembly and adjustment mechanism and an assembly method. Background technique [0002] The Cassegrain telescope is a reflective telescope composed of two mirrors. It adopts the design of folded optics to greatly reduce the length of the lens barrel. The larger mirror is called the primary mirror, and the smaller one is called the secondary mirror. Mirror, the paraboloid of the primary mirror has a hole, and the telescope is imaged behind the primary mirror, and its focal point is called the Cassegrain focus; the parabolic primary mirror reflects and converges the parallel rays entering the telescope at the focal point, which is also the secondary mirror A focal point of the secondary mirror, and then the secondary mirror reflects the light for imaging; the above structure is described as a Cassegrain telescope in an ideal state. In the actual adjus...

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Problems solved by technology

[0003] The Chinese patent application with the application number 201910881002.9 discloses a common-aperture optical system installation and adjustment method with a secondary mirror focusing mechanism. First, the deviation of the secondary mirror is measured by a center deviation measuring instrument, so that the axis of the guide rail is consistent with the rotation axis of the instrument turret. Then use the dual optical path measurement method to make the optical axis of the secondary mirror consistent with the axis of the guide rail. In the process, it is necessary to use a plane compensator to build the optical path, and use the interferometer to perform self-collimation adjustment, adjust the overall assembly position of the secondary mirror focusing mechanism, and make the wave image The difference at the zero position meets the requirements of the system wave aberration, which requires the use of structures such as interferometers, spherical lens compensators, and planar tooling reflectors. The entire measurement process is relatively complicated.

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