Prof. Yi Tan Profile

Prof. Yi Tan

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Proceedings Article | 16 October 2023 Paper

Extended target-dependent Hartmann wavefront detection with partial missing subaperture images

Linxiong Wen, Yi Tan

Proceedings Volume 12792, 127920Q (2023) https://doi.org/10.1117/12.2691072

KEYWORDS: Wavefronts, Wavefront reconstruction, Target detection, Wavefront errors, Image restoration, Photovoltaics, Detection and tracking algorithms, Zernike polynomials, Wavefront sensors, Signal to noise ratio

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When extended target related Hartmann high-precision wavefront detection is applied to near-ground target imaging, short-range laser transmission and other fields, affected by skylight background, atmospheric turbulence intensity, detector noise and other factors, the subaperture image of correlated Hartmann wavefront sensor is often partially missing, resulting in reduced detection accuracy. In order to analyze the problem of precision degradation, a simulation model of extended target wavefront detection based on correlation Hartman is established in this paper. The model is based on Fresnel diffraction, the working principle of Shake-Hartmann wavefront sensor and the Zernike wavefront reconstruction method. The effects of missing sub-aperture images at different positions and different missing degrees on the accuracy of wavefront reconstruction are analyzed. The relationship curves of RMS and PV values of wavefront reconstruction residuals with image deletion of sub-aperture at different positions and different deletion degrees are obtained by simulation. The results show that different position subapertures and different degree of loss will affect the expansion degree of target in the Hartman subaperture. When the correlation algorithm restructures the wavefront, the impact of the loss of the center subaperture on the wavefront reconstruction accuracy is greater than that of the edge subaperture, and the greater the loss degree, the lower the wavefront reconstruction accuracy.

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