提高人眼波前传感器信噪比的实验研究

高卫华; 王肇圻; 母国光

红外与激光工程, 2005, 34 (1): 58, 网络出版: 2006-05-25

提高人眼波前传感器信噪比的实验研究

Experimental study of wavefront sensors for increasing signal-to-noise ratios

论文大纲

高卫华 ^*王肇圻母国光

作者单位

南开大学、天津大学联合研究院,南开大学,现代光学研究所,光电信息技术科学教育部重点实验室,天津,300071

人眼波前像差波前传感器偏振分光棱镜离轴入射 Wavefront aberrations of eyes Hartmann-Shack Hartmann-Shack wavefront sensor Polarizationbeam splitter Off-axial

摘要

Hartmann-Shack(H-S)人眼波前传感器噪声主要是角膜的反射光.本文用模拟人眼对消噪声的两种方法进行了实验研究.首先,对使用偏振分光棱镜(PBS)的H-S系统,在系统出瞳不变,入瞳变化的条件下测量了对应的信噪比.实验证明:与采用薄半透半反镜相比,在光线斜入射消除PBS内部反射噪声的前提下,该方法可使信噪比提高到11:1.其次,对离轴入射法进行实验研究,获得200:1信噪比,最后对上述两种方法获得的光斑点阵进行了比较分析.

Abstract

The primary factor resulting in the noise of Hartmann-Shack wavefront sensors is the light reflected from corneas. A Hartmann-Shack apparatus with unequal entrance and exit pupil sizes are used to investigate two different ways of reducing noise, by measuring the signal-to-noise ratios in artificial eyes. Firstly, in the case of polarization beam splitters with inner reflection removed, the maximal signal-to-noise ratio is shown to be 11∶1, which is much higher than that got by using a traditional pellicle beam splitter. Secondly, the off-axial methods are used and the result is 200∶1. The results above and corresponding spots arrays are discussed and illustrated.

参考文献

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高卫华, 王肇圻, 母国光. 提高人眼波前传感器信噪比的实验研究[J]. 红外与激光工程, 2005, 34(1): 58. 高卫华, 王肇圻, 母国光. Experimental study of wavefront sensors for increasing signal-to-noise ratios[J]. Infrared and Laser Engineering, 2005, 34(1): 58.

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