A Shack-Hartmann Wavefront Sensor for Low Contrast Extended Source Telescope

Abstract

The invention provides a low-contrast extended source telescope Shack Hartmann wavefront sensor, which includes a collimator, a small lens array and a defocused imaging photodetector, and the small lens array is located at the exit pupil of the optical system in front of the sensor On the surface, the collimating mirror is located in front of the small lens array to achieve optical path collimation, the defocused imaging photodetector is located on the focal plane of the small lens array, and a pupil blocking array of small lenses is arranged in front or behind the lens of the small lens array, Or the lenslet array is a lenslet array with pupil shielding. The invention is extremely convenient for assembly and debugging, can greatly improve the wavefront measurement accuracy of low-contrast extended sources such as the sun, is convenient for mass production, and has wide application prospects.

Description

technical field [0001] The invention belongs to the field of low-contrast extended-source high-resolution imaging wavefront detection based on active optics, adaptive optics, optical interference, etc., and specifically relates to a low-contrast extended-source telescope Shack Hartmann wavefront sensor based on small lens pupil occlusion . Background technique [0002] The low-contrast extended source telescope is an astronomical telescope that specializes in observing low-contrast extended sources such as the sun. The difference between this and the night stellar telescope is that the observation target sources are low-contrast extended sources and night astronomical high-contrast targets. , and in order to achieve high-resolution imaging of the telescope, regardless of active optics or adaptive optics, the wavefront sensor of the astronomical telescope is an indispensable core component, providing feedback signals for active optics and adaptive optics closed-loop correctio...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a low-contrast extended-source telescope Shack-Hartmann wavefront sensor based on the pupil occlusion of the small lens, which can overcome the deficiencies of the prior art such as low precision and low anti-interference ability, and utilizes all small The pupil of the lens is blocked and imaged on the defocused image plane of the converging light path of the small lens array to achieve solar telescope wavefront measurement, which eliminates the difficulty of selecting low-contrast feature targets and the low accuracy of related measurement of low-contrast target features, except Except for the pupil occlusion on the small lenses of the entire lens array, there is no need to add any other components to the main optical path of the telescope and the optical path of the wavefront sensor. The structure is very simple, the use is very convenient, and the cost is very low. The characteristic image in the field of view, and the real-time measurement and its accuracy have been greatly improved and guaranteed, which is convenient for mass production

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