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Proceedings Paper

Pulsed Laser ESPI Applied to Particular Rotating Component Problems
Author(s): Richard W. T. Preater
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Paper 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.

Paper Details

Date Published: 16 July 1986
PDF: 4 pages
Proc. SPIE 0599, Optics in Engineering Measurement, (16 July 1986); doi: 10.1117/12.952371
Show Author Affiliations
Richard W. T. Preater, The City University (United Kingdom)

Published in SPIE Proceedings Vol. 0599:
Optics in Engineering Measurement
William F. Fagan, Editor(s)

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