An improved phase diversity wavefront sensor based on the altered exposure time of camera

Qingfeng Kong; Shuai Wang; Ping Yang; Xin Yu; Boheng Lai; Boqing Pang; Yong Liu; Bing Xu

doi:10.1117/12.2284962

24 October 2017 An improved phase diversity wavefront sensor based on the altered exposure time of camera

Qingfeng Kong, Shuai Wang, Ping Yang, Xin Yu, Boheng Lai, Boqing Pang, Yong Liu, Bing Xu

Proceedings Volume 10462, AOPC 2017: Optical Sensing and Imaging Technology and Applications; 104622W (2017) https://doi.org/10.1117/12.2284962
Event: Applied Optics and Photonics China (AOPC2017), 2017, Beijing, China

Abstract

Since the phase diversity (PD) wavefront sensor has the advantages of simple structure and high light energy utilization, it is one of most attractive wavefront detection tools. The accuracy of retrieval wavefront depends on the precision of the detective intensity distribution of the CCD camera. However, limited by manufacture craft, the noise data are inevitably recorded, so CCD has only good performance in fixed dynamic ranges. In this paper, we propose a simple modified phase diversity wavefront sensor based on the altered exposure time of camera to improve the dynamic ranges of CCD. The two images are taken under normal exposure time and saturated exposure time of CCD, and then they are stitched to form a perfect image including accurate high space frequency and low space frequency information. Under same signal to noise ratio a comparison between the improved phase diversity wavefront sensor and the traditional phase diversity wavefront sensor is made by using simulation. The results show that this method can significantly enhance the retrieval wavefront accuracy.

Citation Download Citation

Qingfeng Kong, Shuai Wang, Ping Yang, Xin Yu, Boheng Lai, Boqing Pang, Yong Liu, and Bing Xu "An improved phase diversity wavefront sensor based on the altered exposure time of camera", Proc. SPIE 10462, AOPC 2017: Optical Sensing and Imaging Technology and Applications, 104622W (24 October 2017); https://doi.org/10.1117/12.2284962

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