1 January 1992 Measurement of thermal expansion of a piston using holographic and electronic speckle pattern interferometry
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Abstract
Holographic interferometry and electronic speckle pattern interferometry (ESPI) have both been used to measure the radial expansion of a heated diesel engine piston. A simple "mirror" concept introduced enables simultaneous measurement of in-plane and out-of-plane components of displacements. This concept was verified by using a cantilever and the results agreed to within 5% of the predictions of deflection theory. ESPI and holographic fringes on two views of the piston were recorded on a single frame of a CCD camera. Phase-stepped ESPI fringes were analyzed to obtain two phase maps of different sensitivities on a single video frame. Comparison between holographic and ESPI results were made and possible reasons for the smaller values obtained using ESP1 are proposed. A critical comparison of the two techniques shows that holography has the advantage of enabling study of a 2000 rise in a single stage due to its high quality fringes. ESPI limits the temperature rise to 5°C because of its poorer fringe definition and hence displacement from four stages has to be added vectorially.
Mani Maran Ratnam, Mani Maran Ratnam, W. T. Evans, W. T. Evans, John Raymond Tyrer, John Raymond Tyrer, } "Measurement of thermal expansion of a piston using holographic and electronic speckle pattern interferometry," Optical Engineering 31(1), (1 January 1992). https://doi.org/10.1117/12.56053 . Submission:
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