Estimating the point spread function of an imaging system using wavefront measurement

Hongjun Mao; Yonghui Liang; Zongfu Huang; Jin Liu; Pengzhi Jiang

doi:10.1117/12.2242717

24 October 2016 Estimating the point spread function of an imaging system using wavefront measurement

Hongjun Mao, Yonghui Liang, Zongfu Huang, Jin Liu, Pengzhi Jiang

Proceedings Volume 9682, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 96820P (2016) https://doi.org/10.1117/12.2242717
Event: Eighth International Symposium on Advanced Optical Manufacturing and Testing Technology (AOMATT2016), 2016, Suzhou, China

Abstract

An imaging system is constructed by atmosphere turbulence and ground-based telescope when the latter is used to observe a space object. The wavefront measurement produced by adaptive optics system can be used to estimate the point spread function (PSF) of the imaging system since it contains the wavefront aberration information of the light from the object. But the detector noise of the wavefront sensor (WFS) will inevitably bring estimation error. Based on the statistical theory, a method is presented to improve the PSF estimation accuracy by eliminating the noise error from the wavefront measurement. The numerical simulation shows that the estimation error of this method could be lower than 10%. It also indicates that the higher the signal-noise ratio (SNR) of the WFS is, the more frames of the wavefront measurements are used, and the bigger the Fried constant is, the more accurate the estimation will be. The work in this paper can be applied to performance evaluation of imaging system, deconvolution of AO images, as well as photometric analysis of space object.

Citation Download Citation

Hongjun Mao, Yonghui Liang, Zongfu Huang, Jin Liu, and Pengzhi Jiang "Estimating the point spread function of an imaging system using wavefront measurement", Proc. SPIE 9682, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 96820P (24 October 2016); https://doi.org/10.1117/12.2242717

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KEYWORDS

Point spread functions

Wavefronts

Charge-coupled devices

Error analysis

Quantum efficiency

Adaptive optics

Imaging systems

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