Proceedings PaperAnalysis Of Rotating Component Strains Using Pulsed Espi
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A large proportion of the experimental stress analysis performed is carried out under laboratory conditions. A non-contact method of analysis which may be used under service operating conditions, requiring only minor component surface preparation and little or no plant shut-down, is therefore particularly attractive. Electronic Speckle Pattern Interferometry ( ESP') , a technique for the measurement of in-plane displacements on static components, was pioneered at Loughborough University by Butters and Leendertz 1). Using a pulsed laser with a pulse width of 20 ns in place of the c/w laser will not only remove environmental vibration of the system but will also freeze component movement and widen the scope of the technique to dynamic applications. The development of pulsed laser ESPI for the analysis of rotating component strains is being undertaken at The City University.