Pulsed ESPI for rotating components displacement measurements

Richard W. T. Preater

doi:10.1117/12.22280

1 July 1990 Pulsed ESPI for rotating components displacement measurements

Richard W. T. Preater

Proceedings Volume 1319, Optics in Complex Systems; (1990) https://doi.org/10.1117/12.22280
Event: 15th International Optics in Complex Systems, 1990, Garmisch, Germany

Abstract

ESPI was originally developed(1) for the measurement of in-plane strains in static components. New developments at City University are extending the application to rotating components. A pulsed laser of 20 ns duration freezes the component motion. Two beam oblique illumination of the component surface gives a displacement sensitivity direction in the plane of the illuminating beams. A high resolution speckle tv-camera and digital storage yields clear high-contrast interference fringe patterns on initial state, live-load speckle image subtraction. High precision laser triggering provides the correct register of the speckle images for satisfactory image subtraction. Where component deformation is predominantly speed dependent. allowance must be made for variation in the response time to the component position at different speeds.

Citation Download Citation

Richard W. T. Preater "Pulsed ESPI for rotating components displacement measurements", Proc. SPIE 1319, Optics in Complex Systems, (1 July 1990); https://doi.org/10.1117/12.22280

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