Abstract
Recently we have described an additive-subtractive phase modulated (ASPM) scheme which can be adapted to conventional subtractive speckle interferometry setups to reduce the noise susceptibility of these inspection tools [1–4]. In particular, these ASPM speckle interferometric techniques will freeze out unwanted environmental noise of frequencies much higher than video rates. In this study, we provide an experimental comparison of four speckle interferometric methods based on their performance under the influence of controlled noise. The performance was quantitatively determined using a parameter known as visibility which is a measure of the relative contrast between bright and dark fringes generated by each method. The four methods compared are conventional subtractive ESPI, conventional subtractive shearography, ASPM-ESPI and ASPM-shearography. All of these speckle techniques were configured for out-of-plane displacement or displacement gradient sensitivities.
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References
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© 1995 Plenum Press, New York
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Chatters, T.C., Pouet, B.F., Krishnaswamy, S. (1995). A Comparative Study of Speckle Interferometric Techniques. In: Thompson, D.O., Chimenti, D.E. (eds) Review of Progress in Quantitative Nondestructive Evaluation. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-1987-4_46
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DOI: https://doi.org/10.1007/978-1-4615-1987-4_46
Publisher Name: Springer, Boston, MA
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