19 July 1996 New simple ESPI configurations for deformation studies on large structures based on diffused reference beam
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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, T. Santhanakrishnan, Nandigana K. Krishna Mohan, Nandigana K. Krishna Mohan, Rajpal S. Sirohi, 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); doi: 10.1117/12.245174; https://doi.org/10.1117/12.245174
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