Integration measuring method of wavefront distortion and optical axis vibration of space camera

Abstract

The invention belongs to the optical wavefront measuring technology field and discloses an integration measuring method of wavefront distortion and optical axis vibration of a space camera. According to the method, through improvement and optimized design of a related Hartmann-Shack wavefront sensing method at system formation and a usage mode, the wavefront distortion with a high spatial resolution characteristic can be measured and the optical axis vibration with a high frequency characteristic also can be measured, and integration of wavefront distortion measurement and optical axis vibration measurement of the space camera is realized. The improvement and optimized design mainly comprise that: an image detector with a block read out function is employed, thus raising frame frequency is facilitated in optical axis vibration measurement, employing different reference subimages is facilitated in wavefront distortion measurement and optical axis vibration measurement, and optimization of an array lens focal length is facilitated to satisfy an optical axis vibration detection precision requirement. The method can be used for solving a wavefront distortion and optical axis vibration error sensing problem of the space camera, and can be used for real-time or subsequent compensation to raise system imaging quality.

Description

technical field [0001] The invention belongs to the technical field of optical wavefront measurement and is used for on-orbit integrated detection of space camera wavefront distortion error and optical axis shake. Background technique [0002] High-resolution space cameras usually have the characteristics of large aperture and long focal length optical system, and are more sensitive to environmental changes such as force and heat. High-frequency flutter (optical axis jitter) caused by the movement of moving parts on the star will cause blurred images, geometric distortion on the microscopic scale, and a decrease in surveying and mapping accuracy, while changes in low-frequency environmental factors such as uneven heating and material degradation will cause optical system structure and surface shape changes, resulting in wavefront distortion and reduced image quality; these two types of disturbances often act at the same time and affect the system imaging quality, and with th...

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Problems solved by technology

[0010] Since wavefront distortion detection requires high image resolution, the correlation Hartmann-Shack wavefront sensing method is difficult to achieve high measurement speed due to the limitation of image detector frame frequency and wavefront processing speed, so it is only suitable for Wavefront distortion with slow-changing characteristics, not suitable for measuring optical axis jitter with fast-changing characteristics

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