Pulsed Laser ESPI Applied to Particular Rotating Component Problems

Richard W. T. Preater

doi:10.1117/12.952371

16 July 1986 Pulsed Laser ESPI Applied to Particular Rotating Component Problems

Richard W. T. Preater

Proceedings Volume 0599, Optics in Engineering Measurement; (1986) https://doi.org/10.1117/12.952371
Event: 1985 International Technical Symposium/Europe, 1985, Cannes, France

Abstract

The measurement of in-plane strain under service conditions on components that are rotating is an attractive proposition. Pulsed laser Electronic Speckle Pattern Interferometry (ESPI) which possesses the accuracy of holographic interferometry may be used for the measurement of small strains. The short pulse width of the pulsed laser "freezes" the component motion and overcomes the conventional holographic stability requirements showing this technique to have potential use in an industrial environment. Electronic processing of television speckle images provides an immediate display of interference pattern information for in-plane displacements. Good contrast interference fringes have already been achieved at The City University over a range of component tangential velocities up to 120 ms-1 for a component rotational speed of 10500 rpm. Use of the conventional optical system reveals a certain speed limitation to the technique. However, recent modifications to the optical system have removed this limitation and show potentiallanalysis of components whose tangential velocities are in excess of the present 120 ms-1.

Citation Download Citation

Richard W. T. Preater "Pulsed Laser ESPI Applied to Particular Rotating Component Problems", Proc. SPIE 0599, Optics in Engineering Measurement, (16 July 1986); https://doi.org/10.1117/12.952371

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