Displacement measurement based on the Moire fringe

Xiaoying Li

doi:10.1117/12.916886

15 November 2011 Displacement measurement based on the Moire fringe

Xiaoying Li

Proceedings Volume 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation; 832148 (2011) https://doi.org/10.1117/12.916886
Event: Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 2011, Yunnan, China

Abstract

Moire fringe can be used for measuring the displacement of the object. In this paper, Charge Coupled Device (CCD) is used for capturing the numerical moire fringe, substituting for the usual photodetector. The movable grating is labeled by the special figure, which moves in the moire fringe with the movable grating moving. The original position serves as the reference, and the special figure is searched for in the moire fringe by the correlation operation to determine its shift of pixel in the screen, then by the calibration value to calculate the displacement of the measured object. This method does not need to count the shifting number of the moire fringe. However the lateral magnifying power of lens is considered seriously.

Citation Download Citation

Xiaoying Li "Displacement measurement based on the Moire fringe", Proc. SPIE 8321, Seventh International Symposium on Precision Engineering Measurements and Instrumentation, 832148 (15 November 2011); https://doi.org/10.1117/12.916886

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