10 December 1993 Gaussian threshold for high-fidelity of digital wavefront reconstruction
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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.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mingyi Chen, Mingyi Chen, You-Lue Lin, You-Lue Lin, } "Gaussian threshold for high-fidelity of digital wavefront reconstruction", Proc. SPIE 2003, Interferometry VI: Techniques and Analysis, (10 December 1993); doi: 10.1117/12.165469; https://doi.org/10.1117/12.165469

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