Optical lead-out method for vertex normal of large-caliber concave non-spherical reflector

Abstract

The invention discloses an optical lead-out method for a vertex normal of a large-caliber concave non-spherical reflector. The method comprises the following steps: arranging a concave non-spherical surface in front of an optical interferometer which emits parallel light, and arranging a small-caliber standard spherical mirror at a position which is about 1 / 2 of vertex radius of the non-spherical surface away from the vertex of the non-spherical surface, the concave non-spherical surface, the optical interferometer and the small-caliber standard spherical mirror are coaxially arranged to be used for reflecting light rays reflected by the non-spherical mirror back to the interferometer; substituting beam wavefront data analyzed by the interferometer into optical design software for performing simulating calculation, and obtaining an included angle between the vertex normal of the non-spherical surface and parallel beams of the interferometer; aiming the parallel beams of the interferometer through a theodolite, and guiding the parallel beams to other devices which can characterize the direction; and continuously adjusting the concave non-spherical mirror and a small standard reflector thereof and analyzing and calculating through simulation software, and finally, precisely controlling an angle guided out of a vertex normal direction to be a second order. The method is simple and practicable, is high in precision and has very important application in adjustment and test aspects of spatial optical remote sensors.

Description

technical field [0001] The invention relates to a method for optically extracting the vertex normal of a large-diameter concave aspheric mirror, in particular to a method realized by using optical interference technology. It has an important application in the adjustment and testing of reflective space optical remote sensors. Background technique [0002] The method of optically extracting the vertex normal of the large-diameter concave aspheric mirror has a second-level precision in the derivation accuracy. The inclination of the parallel beam emitted by the interferometer is very sensitive, thus realizing the high-precision extraction of the vertex normal. The first existing technology is to judge whether the light spot reflected by the large-diameter concave aspheric mirror is in the center of the interferometer CCD, and the accuracy is limited by the human eye and the pixel size of the CCD. The second is to place the measured mirror on the centering device by adding a ...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the lead-out accuracy is limited by the end jump and radial run-out accuracy of the turntable, and the lead-out accuracy of the optical axis is generally around 1′

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