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LASER SPECKLE PHOTOGRAPHY FOR HEAT TRANSFER
- https://www.sciencedirect.com/science/article/pii/B9780444816191500216
- Laser speckle photography is a technique making use of the displacement of optical speckle by refraction as information. Speckle patterns through double exposure are recorded photographically and used as diffractive structure in the point-by-point or full field analysis. Speckle displacement, caused by the refraction of scattered light, are measured, so …
Laser Speckle Photography for Surface Tampering …
- https://tlo.mit.edu/technologies/laser-speckle-photography-surface-tampering-detection
- Laser illumination generates precise speckle patterns on a surface depending on the phase of the light wavefront. These laser speckle images encode phase information, depending on the constructive and destructive interferences of …
Laser speckle photography in a fluid medium | Nature
- https://www.nature.com/articles/270045a0
- A TECHNIQUE for obtaining quantitative velocity data from hydrodynamic flow fields using laser speckle photography (LSP) has been developed and uses the scattered light from the interior of a ...
Laser Speckle Photography for Surface Tampering …
- https://groups.csail.mit.edu/graphics/speckle/
- Laser Speckle Photography for Surface Tampering Detection. We detect subtle surface changes that cannot be seen in traditional photography. Top left: our proposed prototype combines an SLR with a consumer pico laser projector. (a), (b) Images of a wall illuminated by the laser projector. The granular pattern (bottom left), called speckle, is caused by interference patterns of …
Laser speckle, explained by RP Photonics Encyclopedia; …
- https://www.rp-photonics.com/laser_speckle.html
- The RP Photonics Buyer's Guide contains 6 suppliers for laser speckle reduction components. Among them: Edmund Optics. Optotune laser speckle reducers remove local interferences and significantly reduce speckle noise in laser …
Laser speckle contrast imaging - Wikipedia
- https://en.wikipedia.org/wiki/Laser_speckle_contrast_imaging
- Laser speckle contrast imaging which can also be called laser speckle imaging is an imaging modality based on the analysis of the blurring effect of the speckle pattern. The operation of LSCI is having a wide-field illumination of a rough surface through a coherent light source. Then using photodetectors such as CCD camera or CMOS sensors imaging the resulting laser speckle …
US9131118B2 - Laser speckle photography for surface …
- https://patents.google.com/patent/US9131118B2/en
- In one embodiment, a method comprises projecting, from a projector, a diffused on an object. The method further includes capturing, with a first camera in a particular location, a reference image of the object while the diffused is projected on the object. The method further includes capturing, with a second camera positioned in the particular location, a test image of the object while the ...
Laser Speckle Photography for Surface Tampering …
- https://people.csail.mit.edu/yichangshih/mywebsite/speckle_final_low_res.pdf
- the speckle generated by laser illumination and exploit the fact that the precise speckle pattern observed from a given viewpoint depends on the phase of the light wavefront and, therefore, is sensitive to tiny perturbations of the imaged surface (Fig.1(a-c)). We focus on the situation where surface tampering is
Applications of Laser Speckle Photography for Thermal Flow …
- http://minsfet.utk.edu/Research/references/pdf_files/app_laserspecle-KD_optics98-V29.pdf
- measured without involving the total heat generation rate. The laser speckle photography technique directly measures h, which provides reduced uncer-tainties and improved measurement resolution, thereby enhanced data accu-racy.17Theßowvelocityintheregionveryclosetothewallispracticallyzero
Clinical applications of laser speckle contrast imaging: a …
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6983474/
- Medical users want a noncontact, fast, simple, and cheap modality. 1 Laser speckle contrast imaging (LSCI) is a fast, full-field, cheap, and relatively simple imaging method that can give 2-D perfusion maps of large surfaces. 2 LSCI is based on the principle that the backscattered light from a tissue that is illuminated with coherent laser light forms a random …
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