Abstract
A digital method is proposed whereby spatial speckles created when an optically rough surface is illuminated by a diffuse coherent laser beam are used to generate slope contour fringes. This is done by photographing the speckles contained in a parallel plane in front of the plate before and after deformation. The resulting photographs are then Fast Fourier Transformed twice with the digital image correlation software CASI to produce slope contours.
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Chiang, F.P.: A family of 2D and 3D experimental stress analysis technique using laser speckle. Solid Mech. Arch. 3(1), 1–32 (1978)
Chiang, F.P., Juang, R.M.: Laser speckle interferometry for plate bending problems. Appl. Opt. 15, 2199–2204 (1976)
Keene, L., Chiang, F.P.: Real-time anti-node visualization of vibrating distributed systems in noisy environments using defocused laser speckle contrast analysis. J. Sound Vib. 320, 472–481 (2009)
Theocaris, P.S.: Moire method in plates. In Proc. Int. Assoc. Shell Struct. Symposium, Warsaw (North Holland, Amsterdam), pp. 877–889 (1963)
Havanesian, J., Varner, J.: Method for determining the bending moments in normal loaded thin plates by holographic interferometry. In: Robertson, E.R., Harvey, J.M. (eds.) Engineering Uses of Holography, pp. 173–185. Cambridge University Press, London (1970)
Schneider, C.A., Rasband, W.S., Eliceiri, K.W.: NIH Image to ImageJ: 25 years of image analysis. Nat. Methods. 9, 671–675 (2012)
Chen, D.J., Chiang, F.P.: Computer-aided speckle interferometry using spectral amplitude fringes. Appl. Opt. 32, 225–236 (1993)
Ligtenberg, F.K.: The moiré method: a new experimental method for the determination of moments in small slab models. SESA Proc. 12(2), 83–98 (1955)
Acknowledgement
We gratefully acknowledge the support of Dr. Rajapakse, and the financial support of the Office of Naval Research through award NO.-N00014-17-1-2873.
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Giordano, A., Chiang, FP. (2019). A Digital Laser Speckle Technique for Generating Slope Contours of Bent Plate. In: Lamberti, L., Lin, MT., Furlong, C., Sciammarella, C., Reu, P., Sutton, M. (eds) Advancement of Optical Methods & Digital Image Correlation in Experimental Mechanics, Volume 3. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-97481-1_28
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DOI: https://doi.org/10.1007/978-3-319-97481-1_28
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