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Dynamic multimode fiber specklegram sensor with automated training data generation for bed-exit prediction. [PDF]

open access: yesBiomed Opt Express
Islam Sarkar MN   +4 more
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Hololens in speckle and speckle shear interferometry

Applied Optics, 1985
This paper presents a number of methods to obtain in-plane displacement, out of plane displacement and slope data using holographic optical elements. The results obtained with a hololens and a holoshear lens are as good as those obtained with conventional optical systems.
C, Joenathan, R K, Mohanty, R S, Sirohi
openaire   +2 more sources

Speckle displacement in holographic and speckle metrology

SPIE Proceedings, 2011
Speckle patterns appearing in laser-illumination of a rough surface show dynamic changes when the surface is deformed or illumination is moved. This change is characterized by correlation functions of speckle intensities before and after the change. After their explicit expressions are introduced, applications for measurement of plant growth and an ...
Ichirou Yamaguchi, Koichi Kobayashi
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Contouring by laser speckles

IEEE Journal of Quantum Electronics, 1981
A technique is presented to determine surface contours of 3-D objects by laser speckle interferometry. A double exposure specklegram is recorded by giving the object a small tilt between exposures. Surface contours are obtained by Fourier filtering of the specklegram.
G K, Jaisingh, F P, Chiang
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Speckle Imaging And Speckle Spectroscopy

SPIE Proceedings, 1989
The atmosphere of the earth restricts the resolution of conventional astronomical imaging to about 1 arcsec. Much higher resolution can be obtained by speckle methods. The Knox-Thompson method and the speckle masking method (bispectrum or triple correlation processing) yield diffraction-limited images in spite of image degradation by the atmosphere and
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