Gaussian threshold for high-fidelity of digital wavefront reconstruction

Mingyi Chen; You-Lue Lin

doi:10.1117/12.165469

10 December 1993 Gaussian threshold for high-fidelity of digital wavefront reconstruction

Mingyi Chen, You-Lue Lin

Proceedings Volume 2003, Interferometry VI: Techniques and Analysis; (1993) https://doi.org/10.1117/12.165469
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

Abstract

An interferogram obtained from a laser interferometer under industrial circumstance usually has a low and unconstant S/N rate, which makes it difficult to analyze the fringe pattern with enough accuracy by using fringe skeleton and fit method, making a low fidelity of a reconstructed wavefront unavoidable. The Gaussian threshold technique (GTT) for digital fringe processing was developed at our lab recently, by which we have processed many interferograms which were either generated by computer simulation or taken from a Fizeau laser interferometer with severe coherence noise, varying background intensity, and contrast. In this paper, the mathematic mode of Gaussian threshold and its algorithm are described. Rigorous estimation of the wavefronts reconstructed from interferograms with poor quality processed by GTT is also presented, the results show that the reconstruction error is less than (delta) /70, and its repeatability is much better than (lambda) /200.

Citation Download Citation

Mingyi Chen and You-Lue Lin "Gaussian threshold for high-fidelity of digital wavefront reconstruction", Proc. SPIE 2003, Interferometry VI: Techniques and Analysis, (10 December 1993); https://doi.org/10.1117/12.165469

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