Analysis Of Rotating Component Strains Using Electronic Speckle Pattern Interferometry

R. W. T. Preater

doi:10.1117/12.942382

18 January 1985 Analysis Of Rotating Component Strains Using Electronic Speckle Pattern Interferometry

R. W. T. Preater

Proceedings Volume 0473, Symposium Optika '84; (1985) https://doi.org/10.1117/12.942382
Event: Symposium Optika '84, 1984, Budapest, Hungary

Abstract

The measurement of in-plane strain rather than out-of-plane displacement is a distinct advantage to engineers. Electronic speckle pattern interferometry (ESPI) rather than holographic interferometry can provide this type of information. The use of a pulsed laser in place of a c/w laser removes the otherwise rigorous stability requirements of conventional holographic techniques and freezes the component movement. Pulsed laser ESPI is a non-contact method which may be used under service environmental conditions. Initial tests using a tv-camera sensitive to low light levels have shown that in conjunction with precision laser triggering interference subtraction fringes can be recorded for component tangential velocities up to 5 ms-1. Digital storage and the recent incorporation of a high resolution tv-camera system has increased the tangential velocity range to 15 ms-1. The combination of this system with image derotation may enable components with much higher velocities to be studied.

Citation Download Citation

R. W. T. Preater "Analysis Of Rotating Component Strains Using Electronic Speckle Pattern Interferometry", Proc. SPIE 0473, Symposium Optika '84, (18 January 1985); https://doi.org/10.1117/12.942382

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