Stabilized And Accelerated Speckle Strain Gauge

Ichirou Yamaguchi; Tamiki Takemori; Koichi Kobayashi

doi:10.1117/12.962746

25 April 1990 Stabilized And Accelerated Speckle Strain Gauge

Ichirou Yamaguchi, Tamiki Takemori, Koichi Kobayashi

Proceedings Volume 1162, Laser Interferometry: Quantitative Analysis of Interferograms: Third in a Series; (1990) https://doi.org/10.1117/12.962746
Event: 33rd Annual Technical Symposium, 1989, San Diego, United States

Abstract

We have improved stability and temporal response of the laser speckle strain gauge. In the gauge a narrow laser beam is incident on a diffuse surface and speckle patterns appearing in the light scattered to certain directions are detected by linear image sensors. The correlator computes the correlation peak between the current frame and a reference one of the sensor which is driven at 1000 frames per second. The reference frame is fixed until the correlation peak becomes lower than a threshold. By employing a pair of the correlators and a laser of output power of a few tens of mW, we could measure dynamic strain of polymer films, between a fraction of Hertz and one hundred Hertz. The resolution of the gauge which only depends on geometry of the optical system and the sensor pitch, is a few tens of microstrains. The upper limit of the measurement can be extended arbitrarily much because small incremental strain is integrated.

Citation Download Citation

Ichirou Yamaguchi, Tamiki Takemori, and Koichi Kobayashi "Stabilized And Accelerated Speckle Strain Gauge", Proc. SPIE 1162, Laser Interferometry: Quantitative Analysis of Interferograms: Third in a Series, (25 April 1990); https://doi.org/10.1117/12.962746

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