Pyramid wavefront sensor and target wavefront detection method

Abstract

The invention provides a pyramid wavefront sensor and a target wavefront detection method.The pyramid wavefront sensor comprises a first convergent lens, a field diaphragm, a cube-corner prism, a second convergent lens and a detection camera which are sequentially arranged in the light beam propagation direction, and the vertex of the cube-corner prism is located at the focus of the first convergent lens; the detection plane of the detection camera is conjugated to the plane where the vertex of the cube-corner prism is located; a micro-lens array is arranged between the second convergent lens and the detection camera, and the micro-lens array is used for effectively separating a target signal and a sky background signal on the detection camera. According to the invention, the cube-corner prism and the micro-lens array are combined, effective separation of a sky background signal and a target signal is realized, a sky value of each sub-aperture is calculated and removed in cooperation with a sky elimination algorithm, effective information of a target is extracted, and the method is more suitable for detection of a weak target and has a wide application prospect. Therefore, the application of the pyramid wavefront sensor in a daytime natural guide star adaptive optical system is effectively realized.

Description

technical field [0001] The invention relates to the technical field of wavefront sensing, in particular to a pyramidal wavefront sensor used in a daytime natural guide star adaptive optical system and a target wavefront detection method. Background technique [0002] Adaptive optics is an optical technology that improves optical imaging quality by correcting wavefront errors. As an important front-end link in adaptive optics, wavefront sensing technology mainly measures wavefront aberrations caused by atmospheric turbulence and other factors for adaptive optics systems in real time, and provides wavefront signals for wavefront processors. Pyramid wavefront sensor is a new type of wavefront sensing technology first proposed by astronomer Roberto Ragazzoni in 1996. It mainly realizes wavefront detection in adaptive optics system, and has been applied to many world-class ground-based large-aperture In the adaptive optics system of astronomical telescope. The optical structure...

AI Technical Summary

Problems solved by technology

according to image 3 and Figure 4 It can be clearly seen that the relatively weaker target signal in the pupil image is covered by the strong skylight background signal, and the effective information of the target cannot be extracted, which leads to the application of the pyramidal wavefront sensor in the daytime natural guide star adaptive optics. extremely restrictive

Images