14 September 1994 Spatiotemporal strain distribution mapping using novel optical heterodyne polarimeter
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A novel method for mapping spatiotemporal strain distributions in a photoelastic sample is described. In an optical heterodyne polarimeter developed, a circularly polarized beam of light is transmitted by a photoelastic sample which is being loaded with time, and then photomixed with a local oscillator beam with linearly polarized two-frequency components. The photocurrent generated in a MOS TV camera possesses the two orthogonal filed components of the signal beam transmitted by the sample, from which the spatiotemporal orthogonal principal strains induced in the sample can be determined. No use of mechanically movable components for polarization alignment allows us to follow a rapid change in the strain distribution. The major advantage of this method is that the orthogonal in-plane principal strains and the out-of-plane strain can be determined independently. The spatial and temporal resolutions in the maps are 0.18 mm and 2.9 ms, respectively.
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Kazuhiko Oka, Kazuhiko Oka, Tomoko Yamaguchi, Tomoko Yamaguchi, Yoshihiro Ohtsuka, Yoshihiro Ohtsuka, } "Spatiotemporal strain distribution mapping using novel optical heterodyne polarimeter", Proc. SPIE 2265, Polarization Analysis and Measurement II, (14 September 1994); doi: 10.1117/12.186692; https://doi.org/10.1117/12.186692

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