Results 261 to 270 of about 841,302 (305)
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Synthetic modal interferometric laser imaging
Applied Optics, 1977Objects can be imaged if passed through a field formed by the interference of a Hermite-Gaussian (modal) laser beam with a spatial offset reference beam. The light intensity scattered by the object is electronically detected and spatially recorded onto film moving synchronously with the object. The recording is a hologram.
K L, Vanvoorhies, C C, Aleksoff
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Laser imaging polarimetry of nacre
Journal of Biophotonics, 2018Nacre is a complex biomaterial made of aragonite‐tablet bricks and organic mortar that is considerably resilient against breakage. Nacre has been studied with a wide range of laboratory techniques, leading to understanding key fundamentals and informing the creation of bio‐inspired materials.
Joshua A, Jones +7 more
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Image Guidance With Laser Applications
Otolaryngologic Clinics of North America, 1996Image-guided laser surgery is defined, and an outline of its development is provided. Recent advances in radiologic imaging provide added visualization of laser-induced tissue effects. Current research around the world illustrates the power and potential of this technique in both laser and nonlaser applications.
M P, Fried, F A, Jolesz, P R, Morrison
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Laser relaxation-oscillation frequency imaging
Optics Letters, 2001We describe a new imaging technique based on modification of laser relaxation frequency induced by coherent optical feedback from an external target. A direct comparison (both theoretical and experimental) is made with laser feedback interferometry techniques, in which there is a modification of the laser's steady state.
E, Lacot, R, Day, J, Pinel, F, Stoeckel
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IEEE Transactions on Aerospace and Electronic Systems, 1966
Selective imaging of objects in range is demonstrated using a giant pulse ruby laser illuminator synchronized with a high speed Kerr cell camera. Elimination of film exposure due to backscatter in a turbid atmosphere is accomplished. Analytic expressions for film exposure due to gated target returns and backscatter luminance are derived.
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Selective imaging of objects in range is demonstrated using a giant pulse ruby laser illuminator synchronized with a high speed Kerr cell camera. Elimination of film exposure due to backscatter in a turbid atmosphere is accomplished. Analytic expressions for film exposure due to gated target returns and backscatter luminance are derived.
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Duplex Laser Doppler Perfusion Imaging
Microvascular Research, 1996A duplex mode for recoding of both spatial and temporal blood perfusion components has been developed and evaluated. This modality, which has been implemented as a software module in the laser Doppler perfusion imager, consists of various local area scan (LAS) configurations.
K, Wårdell, G E, Nilsson
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SPIE Proceedings, 2009
The objective of this work is the suppression of speckles in an image illuminated by a remote laser. This is accomplished by a novel method in which the illuminating laser beam propagates through a multimode fiber dithered at an arbitrary section, then passes through a microlens array prior to illuminating the image generator.
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The objective of this work is the suppression of speckles in an image illuminated by a remote laser. This is accomplished by a novel method in which the illuminating laser beam propagates through a multimode fiber dithered at an arbitrary section, then passes through a microlens array prior to illuminating the image generator.
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Image processing techniques for laser images
Proceedings of 1996 Canadian Conference on Electrical and Computer Engineering, 2002This paper presents the signal processing method of laser images used for detection of small collinear obstacles in helicopter airborne applications. It is very difficult, if not almost impossible, for a regular passive imaging sensor based on CCD detectors to detect such small, remote objects.
I. Saban, S. Faibish
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High resolution laser imaging system
Applied Optics, 1989Computations indicate that a synthetic aperture laser imaging system can provide images with 10-cm resolution at satellite ranges using a 10-W cw laser. When imaging satellites from the ground, the synthetic aperture system reduces atmospheric degradations. The system uses 20-cm diam receiver optics.
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Imaging focused laser differential interferometry
Optics LettersFocused laser differential interferometry (FLDI) is an important diagnostic for measuring density fluctuations in high-speed flows. Currently, however, high dynamic range FLDI is limited to photodiode measurements. In order to spatially resolve multiple locations within complex flows, we present a novel, to the best of our knowledge, refractive-optic ...
Andrew W. Marsh +3 more
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