Correction method for segmenting valid measuring region of interference fringe patterns

Pengcheng Yang; Suping Fang; Leijie Wang; Lei Meng; Masaharu M. Komori; Aizoh Kubo

doi:10.1117/1.3622760

1 September 2011 Correction method for segmenting valid measuring region of interference fringe patterns

Pengcheng Yang, Suping Fang, Leijie Wang, Lei Meng, Masaharu M. Komori, Aizoh Kubo

Author Affiliations +

Funded by: National Natural Science Foundation of China (NSFC), National Natural Science Foundation of China

Optical Engineering, Vol. 50, Issue 9, 095602 (September 2011). https://doi.org/10.1117/1.3622760

Abstract

Segmenting the valid measuring region from an interferogram is an important step in the grazing incidence interferometry, which is related to the accuracy of the measurement result. For the spurious fringes which are generated by the diffuse reflection of the chamfering in the edge of the object surface, we propose a method-spin segment to correct the result of the image segment. First, a phase schematic diagram whose stripe feature is clearer than the original interference fringe patterns is generated. Next, the difference of the gray gradient between the fringe's local normal direction and local tangent direction is calculated to judge the valid measurement region. The principles of selecting some parameters are summarized and the calculation steps are shown. To examine the correction method, the results of an experimental application of spin segment are given to verify the feasibility and accuracy.

©(2011) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Pengcheng Yang, Suping Fang, Leijie Wang, Lei Meng, Masaharu M. Komori, and Aizoh Kubo "Correction method for segmenting valid measuring region of interference fringe patterns," Optical Engineering 50(9), 095602 (1 September 2011). https://doi.org/10.1117/1.3622760

Published: 1 September 2011

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