Improvement of measuring accuracy of spatial fringe analysis method using Kalman filter and its application

Yasuhiko Arai; Shunsuke Yokozeki

doi:10.1117/1.1410103

1 November 2001 Improvement of measuring accuracy of spatial fringe analysis method using Kalman filter and its application

Yasuhiko Arai, Shunsuke Yokozeki

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Optical Engineering, Vol. 40, Issue 11, (November 2001). https://doi.org/10.1117/1.1410103

When the spatial fringe analysis method based on the moire technique is applied to a noisy fringe image, problems arise in the processing with, for example, phase unwrapping, accuracy of analysis, and so on. A digital filter technique and a filter based on time series analysis are applied to the spatial fringe analysis method to solve these problems. In a simulation with a model of the fringe image, results show that the spatial fringe analysis method using digital filters is highly robust against a noise in an image, and that the method using a Kalman filter can smoothly and accurately detect the phase map of the object with a continuous phase distribution. Furthermore, the method is applied to analyze a speckle fringe image in ESPI. A new speckle interferometry based on the proposed method can analyze specklegrams with a normal ESPI system. The results show that a spatial fringe analysis method based on the moire technique can analyze accurately the phase of a speckle fringe image using only a single fringe image. The proposed method can be anticipated to accelerate the use of ESPI in industry.

©(2001) Society of Photo-Optical Instrumentation Engineers (SPIE)

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Yasuhiko Arai and Shunsuke Yokozeki "Improvement of measuring accuracy of spatial fringe analysis method using Kalman filter and its application," Optical Engineering 40(11), (1 November 2001). https://doi.org/10.1117/1.1410103

Published: 1 November 2001

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