Computer-aided high-accuracy testing of reflective surface with reverse Hartmann test

Daodang Wang, Sen Zhang, Rengmao Wu, Chih Yu Huang, Hsiang Nan Cheng, Rongguang Liang

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


The deflectometry provides a feasible way for surface testing with a high dynamic range, and the calibration is a key issue in the testing. A computer-aided testing method based on reverse Hartmann test, a fringe-illumination deflectometry, is proposed for high-accuracy testing of reflective surfaces. The virtual "null" testing of surface error is achieved based on ray tracing of the modeled test system. Due to the off-axis configuration in the test system, it places ultra-high requirement on the calibration of system geometry. The system modeling error can introduce significant residual systematic error in the testing results, especially in the cases of convex surface and small working distance. A calibration method based on the computer-aided reverse optimization with iterative ray tracing is proposed for the high-accuracy testing of reflective surface. Both the computer simulation and experiments have been carried out to demonstrate the feasibility of the proposed measurement method, and good measurement accuracy has been achieved. The proposed method can achieve the measurement accuracy comparable to the interferometric method, even with the large system geometry calibration error, providing a feasible way to address the uncertainty on the calibration of system geometry.

Original languageEnglish (US)
Pages (from-to)19671-19681
Number of pages11
JournalOptics Express
Issue number17
StatePublished - Aug 22 2016

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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