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Phase Shifting, Polarization Stepping and Fourier Transform Methods

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Digital Photoelasticity

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Abstract

In the previous chapter, data acquisition by fringe skeleton identification was discussed. The skeleton identification became much simpler and effective if intensity variations over the fringe field were also taken into account. In view of skeleton identification, the data being collected is restricted to these zones. In the early stages of automatic acquisition of photoelastic data, several point-by-point methods were proposed which also utilised intensity information for automation. In these techniques, either the analyzer/polarizer or the compensator is rotated continuously to produce a modulated intensity signal at the point of interest. Data is recorded based on either the intensity signal is monitored for its minimum value or the phase of the modulated signal is compared with that of a reference signal [1-11]. Thus, the use of intensity information in some form has always attracted researchers to improve the methodology of data acquisition in photoelasticity.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Indian Institute of Technology, 208016, Kanpur, India

    Professor K. Ramesh

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  1. Professor K. Ramesh
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  1. Department of Mechanical Engineering, Indian Institute of Technology, 208016, Kanpur, India

    K. Ramesh

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© 2000 Springer-Verlag Berlin Heidelberg

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Ramesh, K. (2000). Phase Shifting, Polarization Stepping and Fourier Transform Methods. In: Ramesh, K. (eds) Digital Photoelasticity. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-59723-7_5

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  • DOI: https://doi.org/10.1007/978-3-642-59723-7_5

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-64099-5

  • Online ISBN: 978-3-642-59723-7

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