Research on automatic Hartmann test of membrane mirror

Xing Zhong; Guang Jin; Chunyu Liu; Peng Zhang

doi:10.1117/12.865356

12 October 2010 Research on automatic Hartmann test of membrane mirror

Xing Zhong, Guang Jin, Chunyu Liu, Peng Zhang

Proceedings Volume 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 76566G (2010) https://doi.org/10.1117/12.865356
Event: 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2010, Dalian, China

Abstract

Electrostatic membrane mirror is ultra-lightweight and easy to acquire a large diameter comparing with traditional optical elements, so its development and usage is the trend of future large mirrors. In order to research the control method of the static stretching membrane mirror, the surface configuration must be tested. However, membrane mirror's shape is always changed by variable voltages on the electrodes, and the optical properties of membrane materials using in our experiment are poor, so it is difficult to test membrane mirror by interferometer and null compensator method. To solve this problem, an automatic optical test procedure for membrane mirror is designed based on Hartmann screen method. The optical path includes point light source, CCD camera, splitter and diffuse transmittance screen. The spots' positions on the diffuse transmittance screen are pictured by CCD camera connected with computer, and image segmentation and centroid solving is auto processed. The CCD camera's lens distortion is measured, and fixing coefficients are given to eliminate the spots' positions recording error caused by lens distortion. To process the low sampling Hartmann test results, Zernike polynomial fitting method is applied to smooth the wave front. So low frequency error of the membrane mirror can be measured then. Errors affecting the test accuracy are also analyzed in this paper. The method proposed in this paper provides a reference for surface shape detection in membrane mirror research.

Citation Download Citation

Xing Zhong, Guang Jin, Chunyu Liu, and Peng Zhang "Research on automatic Hartmann test of membrane mirror", Proc. SPIE 7656, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 76566G (12 October 2010); https://doi.org/10.1117/12.865356

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KEYWORDS

Mirrors

Electrodes

CCD cameras

Wavefronts

Optical testing

Distortion

Image processing

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