1 May 1986 Accelerated Laser Speckle Strain Gauge
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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 the linear image sensors and microcomputer in the conventional version. The detector, called a spatial filtering detector with an 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 millivolts per microstrain. We applied this gauge to strain measurements of high-polymer films in various directions under loading at frequencies up to several tens of hertz and were able to evaluate their Poisson ratios.
Ichirou Yamaguchi, Takeo Furukawa, Toshitsugu Ueda, Eiji Ogita, "Accelerated Laser Speckle Strain Gauge," Optical Engineering 25(5), 255671 (1 May 1986). https://doi.org/10.1117/12.7973883 . Submission:


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