Instrumentation, Measurement, and Metrology

Testing an aspheric mirror based on phase measuring deflectometry

[+] Author Affiliations
Wenchuan Zhao

Sichuan University,Department of Opto-Electronics, 24 South Section, 1 Yihuan Road, Chengdu, 610064, China

Xianyu Su

Sichuan University,Department of Opto-Electronics, 24 South Section, 1 Yihuan Road, Chengdu, 610064, China

Yuankun Liu, Qican Zhang

Sichuan University,Department of Opto-Electronics, 24 South Section, 1 Yihuan Road, Chengdu, 610064, China

Opt. Eng. 48(10), 103603 (October 20, 2009). doi:10.1117/1.3250241
History: Received December 05, 2008; Revised June 12, 2009; Accepted September 01, 2009; Published October 20, 2009
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A method based on basic phase measuring deflectometry is proposed for testing the aspherical mirror. The method uses a reference screen in two different distances from the mirror under test. The sinusoidal, intensity-modulated patterns generated by the computer are displayed on the LCD screen, and the camera observes the patterns reflected off the testing mirror. The observed pattern appears distorted depending on the shape of the mirror. Using the phase-shifting technique, the original ray of every image point and its corresponding deflected ray can be constructed. Their intersection points and the surface normal are obtained. Then the mirror surface is reconstructed with high accuracy by numerically integrating the surface normals. The proposed method is robust against noise and can test the mirror full field. In this work, the method is introduced, and computer simulation and experimental results are shown.

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© 2009 Society of Photo-Optical Instrumentation Engineers

Citation

Wenchuan Zhao ; Xianyu Su ; Yuankun Liu and Qican Zhang
"Testing an aspheric mirror based on phase measuring deflectometry", Opt. Eng. 48(10), 103603 (October 20, 2009). ; http://dx.doi.org/10.1117/1.3250241


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