Whole-field speckle strain sensor

Mikael Sjodahl

doi:10.1117/12.347769

7 May 1999 Whole-field speckle strain sensor

Mikael Sjodahl

Proceedings Volume 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99); (1999) https://doi.org/10.1117/12.347769
Event: Optical Engineering for Sensing and Nanotechnology (ICOSN '99), 1999, Yokohama, Japan

Abstract

The construction of a whole field speckle strain sensor is reported. The sensor makes use of the in-plane motion of defocused laser speckles in a telecentric imaging system. To distinguish between the contribution to the speckle motion from surface displacement, strain, rotation and tilt three different illumination directions were used. For illumination three pigtailed laser diodes of slightly different wavelength was used. To allow for simultaneous acquisition of the three speckle patterns, the different wavelengths were splitted with the aid of dichroic mirrors and directed onto separate synchronized detectors. The motion of the three speckle patterns is calculated using digital speckle photography and combined to give the three in-plane components of the strain tensor. A discussion about sources of random and systematic errors are included.

Citation Download Citation

Mikael Sjodahl "Whole-field speckle strain sensor", Proc. SPIE 3740, Optical Engineering for Sensing and Nanotechnology (ICOSN '99), (7 May 1999); https://doi.org/10.1117/12.347769

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