Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)
- Volume 1 Issue 2
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- Pages.125-133
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- 1993
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- 1225-6382(pISSN)
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- 2234-0149(eISSN)
A Study on the Rotating Displacement Measurement of Rigid Body by ESPI Method
ESPI법에 의한 강체 회전 변위 측정에 관한 연구
Abstract
Electronic Speckle Pattern Interferometry(ESPI) using a CW laser, a video system and image processor was applied to the rotating displacement of rigid body. ESPI require no special surface preparation or attachments and displacements between any two arbitrary points on the surface can be measured. The characteristic speckle pattern formed when imaging a scattering surface illuminated by laser light retains phase information, which can be used for interferometric measurement of surface displacement. The application of this principle to measuring in-plane displacement resolved in one direction is described, together with the novel use of television equipment to detect and process the information contained in the speckle pattern. This is faster, and more convenient and versatile than customary photographic methods.