Isochromatic photoelastic phase map unwrapping: temporal versus spatial approach

Jing-Tai Wu; Min-Jui Huang

doi:10.1117/1.OE.54.8.081207

8 May 2015 Isochromatic photoelastic phase map unwrapping: temporal versus spatial approach

Jing-Tai Wu, Min-Jui Huang

Author Affiliations +

Optical Engineering, Vol. 54, Issue 8, 081207 (May 2015). https://doi.org/10.1117/1.OE.54.8.081207

Abstract

A comparison of temporal and spatial unwrapping on a photoelastic isochromatic phase map is discussed. The analytical results show that the two-dimensional Macy’s spatial unwrapping can yield a quite good retrieval if an inconsistency-free isochromatic map is to be treated as is true in most of the photoelastic problem cases. While only temporal wrapped data are provided for the phase retrieving work, the success strongly depends on providing the correct changing ratio between the two (or more) temporal states, (e.g., percentage variation of load or wavelength step). The simulation of an incorrect ratio of the temporal isochromatic work on the accuracy of the retrieving work is performed. Experimental results show that temporal unwrapping error is more easily occurs near a highly stressed zone.

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Jing-Tai Wu and Min-Jui Huang "Isochromatic photoelastic phase map unwrapping: temporal versus spatial approach," Optical Engineering 54(8), 081207 (8 May 2015). https://doi.org/10.1117/1.OE.54.8.081207

Published: 8 May 2015

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