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Optical Engineering

Accelerated Laser Speckle Strain Gauge
Author(s): Ichirou Yamaguchi; Takeo Furukawa; Toshitsugu Ueda; Eiji Ogita
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Paper Abstract

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.

Paper Details

Date Published: 1 May 1986
PDF: 6 pages
Opt. Eng. 25(5) 255671 doi: 10.1117/12.7973883
Published in: Optical Engineering Volume 25, Issue 5
Show Author Affiliations
Ichirou Yamaguchi, The Institute of Physical and Chemical Research (Japan)
Takeo Furukawa, The Institute of Physical and Chemical Research (Japan)
Toshitsugu Ueda, Yokogawa Hokushin Electric Corporation (Japan)
Eiji Ogita, Yokogawa Hokushin Electric Corporation (Japan)

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