Inhibiting noise of light spot image

WANG Wei; CHEN Huai-xin

In the adaptive optical systems,the precision of Hartmann-Shack wavefront sensor relies on the centroid detecting accuracy,but the noise in the light spot image lead to centroid detecting error.So the noise should be inhibited before estimating centroid.According to analyzing five kinds of common filtering methods by computer simulation and experiment,the two nonlinear filtering algorithms are showed to be the optimal selection.The study will offer valuable reference in enhancement of the precision of wavefront measurement.

1. Department of Physics, Huaibei Coal Industry Teachers College, Huaibei 235000, China;

2. School of Electronics and Information, Sichuan University, Chengdu 610064, China

Received Date: 2005-11-01

Accepted Date: 2006-03-27

Available Online: 2007-02-25

Abstract: In the adaptive optical systems,the precision of Hartmann-Shack wavefront sensor relies on the centroid detecting accuracy,but the noise in the light spot image lead to centroid detecting error.So the noise should be inhibited before estimating centroid.According to analyzing five kinds of common filtering methods by computer simulation and experiment,the two nonlinear filtering algorithms are showed to be the optimal selection.The study will offer valuable reference in enhancement of the precision of wavefront measurement.

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Reference (10)

[1]	SEIFERT L,LIESENER J,TIZIANI H J.The adaptive shack-artmann sensor[J].Opt Commun,2003,216:313～319.
[2]	YANG H F,JIANG Z F.Research of Zernike modal wavefront reconstruction of 19-element Hartmann-Shack wavefront sensor[J].LaserTechnology,2005,29(5):484～487(in Chinese).
[3]	PARK S K,BAIK S H,KIM C J et al.A study on a fast measuring technique of wavefront using a Hartmann-Shack sensor[J].Optics Laser Technology,2002,34 (7):687～694.
[4]	SHEN F,JIANG W H.The measurement error of wavefront phase with Shack-Hartmann wavefront sensor[J].Acta Optica Sinica,2000,20(5):666～671 (in Chinese).
[5]	CAO G R,YU X.Accuracy analysis of a Hartmann-Shack wavefront sensor operated with a faint object[J].Opt Engng,1994,33 (7):2331～2335.
[6]	SUN A X,WANG J,HE H X et al.Testing precision analysis of centrobaric of laser facula[J].Laser Technology,2004,28 (6):667～672 (in Chinese).
[7]	SHEN F,JIANG W H.Slope measurement error of Shack-Hartmann wavefront sensor under realistic atmospheric turbulence with low-levellight beacon[J].High Power Laser and Particle Beams,2001,13(5):549～554(in Chinese).
[8]	GONZALEZ R C,WOODS R E.Digital image processing[M].2nd ed,New Jersey:Prentice Hall,2002.110～122.
[9]	CHANG Sh L,CHEN Zh,HU Y M.The design of image auto-recognition system in measuring the wavefront of a high power laser system[J].Laser Infrared,2001,31 (2):96～98 (in Chinese).
[10]	LU M A,WANG Ch H,LI M.Study on methods for inhibiting random noise of wavefront sensor used in low light level[J].Opto-electronic Engineering,2002,29 (6):1～4 (in Chinese).

Inhibiting noise of light spot image

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References

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