New simple ESPI configurations for deformation studies on large structures based on diffused reference beam

T. Santhanakrishnan; Nandigana K. Krishna Mohan; Rajpal S. Sirohi

doi:10.1117/12.245174

19 July 1996 New simple ESPI configurations for deformation studies on large structures based on diffused reference beam

T. Santhanakrishnan, Nandigana K. Krishna Mohan, Rajpal S. Sirohi

Author Affiliations +

Proceedings Volume 2861, Laser Interferometry VIII: Applications; (1996) https://doi.org/10.1117/12.245174
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

Two simple Electronic Speckle Pattern Interferometer (ESPI) configurations have been devised based on diffused reference beam which provides out-of-plane displacement data over the whole field. Both configurations use a tiny diffuser to generate the reference beam. This makes the system insensitive to reference beam misalignment, simplifies the construction of ESPI setup and allows larger area of observation unlike the conventional ESPI system. Thermal deflection studies on a cantilever plate have been carried out. Experimental results and features over the conventional ESPI system are discussed.

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T. Santhanakrishnan, Nandigana K. Krishna Mohan, and Rajpal S. Sirohi "New simple ESPI configurations for deformation studies on large structures based on diffused reference beam", Proc. SPIE 2861, Laser Interferometry VIII: Applications, (19 July 1996); https://doi.org/10.1117/12.245174

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