Micro-Photoelasticity and its Picture Processing
Two micro-photoelastic equipment models, reflective and transparent model, are made by improving of a metallurgical microscope. The sensitivity of the former model is twice that of the latter one. Photoelastic fringes can be observed clearly in a monofilament with 200 to 400 μm in diameter. Its fringes were analyzed by numerical integration. Some preliminary tests were also conducted with polymer monofilaments. Moreover, the equipment has been developed to continuously and automatically measure the coefficient of birefringence in monofilaments. Fringe patterns are recorded taken by a TV camera, then its video signals are fed to a microcomputer after being converted into digital signals by an A/D converter. The results are consistent with those from photographs.
KeywordsTest Piece Fringe Pattern Video Signal Reflective Model Liquid Bath
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