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The field of space imaging optics is committed to developing large field of view, large aperture, and unobstructed space optical imaging systems. The structure of optical systems has evolved from coaxial optical systems to off axis optical systems. In order to reduce the difficulty of installation and improve the efficiency of off-axis multi-reflection optical systems, the paper studies the precision installation and adjustment process method of off-axis multi-reflection optical systems on account of the principles of spherical autocollimation and spatial coordinate measurement. Establish global coordinate system based on the optical design and processing benchmark of the off-axis multi-reflection optical system, use a laser tracker and auto-collimation theodolite to accurately locate the elevation and azimuth angles of the reflector, and adjust the optical target ball to the theoretical center point position and align with PSM. Remove the target ball. If the actual center of the spherical mirror is not in the theoretical coordinate position, the position deviation and sharpness between the reflection image point and the point light source can be monitored in real-time, and the posture of the mirror can be precisely adjusted to make its reflection image point coincide with PSM. This process method can achieve high-precision and high-efficiency adjustment of the off-axis multi-reflection optical system. The assembly results show that the spatial coordinate position error between the mirrors in the off-axis multi-reflection optical system is better than 15μm through high-precision spatial coordinate positioning, reference transfer and precision measurement. The angle error is better than 30″, and the center field of view wave aberration RMS=0.034λ@632.8nm, meeting the design specifications.
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