An improved version of the laser speckle strain gauge is presented in which speckle displacement caused by deformation of a laser illuminated object is detected in real time using new photodetectors in place of linear image sensors and microcomputer in the conventional version. The detector, called a spatial filtering detector with electronic scanning facility, produces a voltage directly proportional to speckle displacement. Therefore, this strain gauge, which utilizes differential speckle displacement, delivers a voltage that is proportional to surface strain. It has a strain sensitivity of a few mV/microstrain. We applied this gauge to strain measurements of high-polymer films in various directions under loading at frequencies up to several tens of Hz and were able to evaluate their Poisson's ratios.
|ホスト出版物のタイトル||Proceedings of SPIE - The International Society for Optical Engineering|
|編集者||Henri H. Arsenault|
|Place of Publication||Bellingham, WA, USA|
|出版ステータス||Published - 1985|
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