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Proceedings Paper

Analysis Of Rotating Component Strains Using Electronic Speckle Pattern Interferometry
Author(s): R. W. T. Preater
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Paper 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.

Paper Details

Date Published: 18 January 1985
PDF: 4 pages
Proc. SPIE 0473, Symposium Optika '84, (18 January 1985); doi: 10.1117/12.942382
Show Author Affiliations
R. W. T. Preater, The City University (England)

Published in SPIE Proceedings Vol. 0473:
Symposium Optika '84
Gabor Lupkovics; Andras Podmaniczky, Editor(s)

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