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Speckle Symmetry with High‐Contrast Coronagraphs
Publications of the Astronomical Society of the Pacific, 2002We investigate the pattern of residual speckles obtained with high-contrast coronagraphs and extreme adaptive optics systems. In particular, we provide evidence of symmetry occurring for very small phase defects depending only on the ability of the coronagraph to attenuate the pupil diffraction pattern.
Boccaletti, Anthony +2 more
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Quantum electronics (Woodbury, N.Y.), 2020
Laser speckle contrast imaging of the microcirculatory bed of the pancreas is performed, which allows its condition to be assessed and thereby is an additional valuable tool for making a diagnostic decision and dynamically monitoring the effectiveness of
E. V. Potapova +8 more
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Laser speckle contrast imaging of the microcirculatory bed of the pancreas is performed, which allows its condition to be assessed and thereby is an additional valuable tool for making a diagnostic decision and dynamically monitoring the effectiveness of
E. V. Potapova +8 more
semanticscholar +1 more source
Contrast of Photographically Recorded Speckle Patterns
Optica Acta: International Journal of Optics, 1976The probability density function of the irradiance distribution of the incoherent superposition of uncorrelated speckle patterns is calculated. Using this probability density function the contrast of a photographic recording of the irradiance distribution is determined, taking the non-linearity of the film characteristic into account.
Eliasson, B., Dändliker, R.
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Lasers in Surgery and Medicine, 2020
Keloids are described as benign dermal fibroproliferative lesions, and vascularization may play a significant role in their pathogenesis. In this study, laser speckle contrast imaging (LSCI) was used to assess perfusion within keloids and surrounding ...
Cheng Chen +6 more
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Keloids are described as benign dermal fibroproliferative lesions, and vascularization may play a significant role in their pathogenesis. In this study, laser speckle contrast imaging (LSCI) was used to assess perfusion within keloids and surrounding ...
Cheng Chen +6 more
semanticscholar +1 more source
Optics Letters, 2020
We establish the equivalence between laser speckle contrast-based and diffuse correlation spectroscopy methods inin vivo imaging of blood flow using the Volterra integral equation theory.
K. Murali, A. Nandakumaran, H. Varma
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We establish the equivalence between laser speckle contrast-based and diffuse correlation spectroscopy methods inin vivo imaging of blood flow using the Volterra integral equation theory.
K. Murali, A. Nandakumaran, H. Varma
semanticscholar +1 more source
Aspects of speckle contrast metrology
SPIE Proceedings, 2010Recent revitalization of interests in applying speckle techniques gives rise to the concern of measurement accuracy. In particular, speckle contrast, an important metric in numerous optical techniques, is affected by many factors related to light sources, propagation media, and receivers.
L. Tchvialeva +6 more
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Influence of geometry on polychromatic speckle contrast
Journal of the Optical Society of America A, 2007Understanding speckle behavior is very important in speckle metrology application. The contrast of a polychromatic speckle depends not only on surface roughness and the coherence length of a light source, as shown in previous works, but also on optical geometry.
Haishan Zeng +3 more
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Journal of Optics, 2020
A technique based on the superposition of two uncorrelated speckle patterns and speckle contrast measurement is proposed and demonstrated to track the polarization rotation of an optical beam behind a scattering layer.
Abhijit Roy, R. Singh, M. Brundavanam
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A technique based on the superposition of two uncorrelated speckle patterns and speckle contrast measurement is proposed and demonstrated to track the polarization rotation of an optical beam behind a scattering layer.
Abhijit Roy, R. Singh, M. Brundavanam
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Speckle contrast of the sum of N partially correlated speckle patterns
Journal of the Optical Society of America A, 2012In this paper a general method is presented for calculating the theoretical speckle contrast of a sum of correlated speckle patterns, motivated by the need to suppress the presence of speckle in laser projection displays. The method is applied to a specific example, where correlated speckle patterns are created by sequentially passing light through ...
Sigbjørn Vindenes Egge +2 more
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Tracking and navigation of a microswarm under laser speckle contrast imaging for targeted delivery
Science RoboticsMicro/nanorobotic swarms consisting of numerous tiny building blocks show great potential in biomedical applications because of their collective active delivery ability, enhanced imaging contrast, and environment-adaptive capability.
Qinglong Wang +14 more
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