Stray light detection method outside the field of view of the three-mirror coaxial optical system of space optical remote sensor

Abstract

The invention discloses a method for detecting stray light outside field of view of a space optical remote senor three-mirror coaxial optical system and belongs to the technical field of space optical remote sensing. The method comprises the following steps: simulating a light source by adopting an integrating sphere, simulating light source change inside and outside the field of view of a space optical remote sensor by translating and rotating the integrating sphere, and imaging under different light source influences by utilizing the space optical remote senor. The response output conditions of the optical remote senor are tested, and the influence range of the light source outside the field of view is determined, so that the effectiveness and accuracy of stray light suppression measures are checked, and on-orbit imaging quality of the space optical remote senor is ensured.

Description

technical field [0001] The invention belongs to the technical field of aerospace optical remote sensing, and relates to a method for detecting stray light outside the visual field of a space optical system. Background technique [0002] At present, some space optical remote sensing cameras are equipped with an aspheric three-mirror coaxial off-field optical system. In the optical system, the reflector adopts the form of optical splicing. When working on the track, its task is to detect the ground target and make the target image uniformly. [0003] Stray light refers to the non-imaging beam that reaches the image plane of the optical system. Its direct impact on the optical system is to reduce the contrast of the image plane, reduce the signal-to-noise ratio of the image, and degrade the imaging quality. As one of the important parameters to calibrate the quality of optical imaging, the detection of stray light outside the field of view is extremely important. [0004] The...

AI Technical Summary

Problems solved by technology

[0009] The design of the stray light suppression structure will increase the obscuration of light in the field of view, and the increase of the obscuration ratio will cause the image quality to decline, so the design margin of the stray light suppression structure is usually small; at the same time, in the actual adjustment process of the optical system , due to processing errors, installation errors, etc., the stray light suppression structure cannot be completely consistent with the theoretical design; in addition, the mismatch between the stray light suppression structures will also introduce light outside the field of view, thus affecting the imaging quality

At present, the combined stray light suppression effect of the outer hood, secondary mirror hood and primary mirror extinction cone set by the optical system is usually explained by calculating the stray light coefficient through simulation analysis, and there is no standard detection method

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