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OCT Products in the News
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(5 articles) Moscow State University
(5 articles) University of Oulu
(3 articles) Argonne National Laboratory
(3 articles) Indian Institute of Technology at Delhi
(3 articles) University of Houston
(3 articles) University of Kent
(3 articles) Nottingham Trent University
(3 articles) Massachusetts Institute of Technology
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Electrophoretic mobility of concentrated carbon black dispersions in a low-permittivity solvent by optical coherence tomography
Explore Article ScienceDirect (Feb 24 2010) Other Non-Medical
Electrophoretic mobilities of concentrated dispersions of carbon black particles in a low-permittivity solvent were measured using differential-phase optical coherence tomography (DP-OCT). An electrode spacing of only 0.18 mm enables measurement of highly concentrated dispersions up to 1 wt.% of highly absorbing carbon black particles with high electric fields at low potentials. The capabilities of this DP-OCT method, including high sensitivity, high spatial resolution, and strong electric fields, enable enhanced measurement of low electrophoretic mobilities encountered in low-permittivity solvents. The zeta potential of carbon black particles ranged from −24 mV to −12 mV as the concentration of surfactant sodium bis(2-ethyl-1-hexyl)sulfosuccinate (AOT) ...
Comment on Article Mentions: Thomas E. Milner University of Texas at Austin
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In situ 24 kHz coherent imaging of morphology change in laser percussion drilling
Explore Article opticsinfobase.org (Feb 18 2010) Other Non-Medical
We observe sample morphology changes in real time 24 kHz during and between percussion drilling pulses by integrating a low-coherence microscope into a laser micromachining platform. Nonuniform cut speed and sidewall evolution in stainless steel are observed to strongly depend on assist gas. Interpulse morphology relaxation such as hole refill is directly imaged, showing dramatic differences in the material removal process dependent on pulse duration/peak power (s/0.1 kW, ps/20 MW) and material (steel, lead zirconate titanate PZT). Blind hole depth precision is improved by over 1 order of magnitude using in situ feedback from the imaging system.
Comment on Article Mentions: James M. Fraser Victor X. D. Yang University of Toronto
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Plant photonics: application of optical coherence tomography to monitor defects and rots in onion
Explore Article www3.interscience.wiley.com (Feb 8 2010) Other Non-Medical
The incidence of physiological and/or pathological defects in many fresh produce types is still unacceptably high and accounts for a large proportion of waste. With increasing interest in food security their remains strong demand in developing reliable and cost effective technologies for non-destructive screening of internal defects and rots, these being deemed unacceptable by consumers. It is well recognized that the internal defects and structure of turbid scattering media can be effectively visualized by using optical coherence tomography (OCT). In the present study, the high spatial resolution and advantages of OCT have been demonstrated for imaging the skins and outer ...
Comment on Article Mentions: Igor V. Meglinski Chittanon Buranachai Prince of Songkla University
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Application of optical coherence tomography to automated contact lens metrology
Explore Article SPIE Digital Library (Jan 20 2010) Ophthalmology , Other Non-Medical
Optical coherence tomography (OCT) is a nondestructive imaging modality with the potential to make quantitative spatial measurements. OCT's noncontact nature, sensitivity to small refractive index mismatches, and micron-scale resolution make it attractive for contact lens metrology, specifically, measuring prism. Prism is defined as the maximum difference in thickness of the contact lens, measured over a full 360 deg of rotation, at a fixed distance from the contact lens edge. We develop and test a novel algorithm that automatically analyzes OCT images and calculates prism. Images are obtained using a Thorlabs OCT930SR OCT system. The OCT probe is fastened to an ...
Comment on Article Mentions: Thorlabs Jennifer K. Barton University of Arizona
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Speckle noise reduction in optical coherence tomography of paint layers
Explore Article opticsinfobase.org (Dec 21 2009) Art , NDE/NDT , Other Non-Medical
We present and characterize a sequential angular compounding method for reducing speckle contrast in optical coherence tomography images of paint layers. The results are compared with postprocessing methods, and we show that the compounding technique can improve the speckle contrast ratio in B-scans by better than a factor of 2 in exchange for a negligible loss of resolution. As a result, image aesthetics are improved, thin layers become more distinct, and edge-detection algorithms work more efficiently. The effect of varying the angular scan size and number of averages is investigated, and it is found that a degree of statistical correlation ...Comment on Article Mentions: Adrian G. Podoleanu University of Kent
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Michelson Diagnostics Wins Grant for Miniature OCT Probe Development
Explore Article Optical Coherence Tomography News (Nov 23 2009) Other Non-Medical , Funding
Michelson Diagnostics Ltd , the London, UK based developer and manufacturer of Optical Coherence Tomography (OCT) products, has won a £25,000 grant from the UK Government’s Technology Strategy Board (TSB). The grant is for a study into the feasibility of highly miniaturised OCT probes for cancer diagnoses. According to TSB data, seven hundred applications for funding were received, and Michelson Diagnostics application was one of just sixty-nine to be funded. Jon Holmes, CEO of Michelson Diagnostics, explained that the funded project will help Michelson determine which technologies to use in the development of practical rigid and/or flexible OCT probes, for ...
Comment on Article Mentions: Michelson Diagnostics Michelson Diagnostics Vivosight Jon Holmes
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Generating model signals for interferometry
Explore Article PatFT » Page 1 of 1 (Nov 17 2009) Other Non-Medical , Patents
A method is disclosed which includes, for each of multiple areas of a test surface on a test object having different reflectivities, using an interferometry system to measure each area in a first mode of operation that measures information about the reflectivity of the area over a range of angles and wavelengths; using the same interferometry-system to measure the test surface in a second mode of operation that interferometrically profiles a topography of the test surface over a range including at least some of the multiple areas; and correcting the profile based on the information about the reflectivity of the ... -
Interferometer with multiple modes of operation for determining characteristics of an object surface
Explore Article PatFT » Page 1 of 1 (Nov 10 2009) Other Non-Medical , Patents
Disclosed is a system including: (i) an interferometer configured to direct test electromagnetic radiation to a test surface and reference electromagnetic radiation to a reference surface and subsequently combine the electromagnetic radiation to form an interference pattern, the electromagnetic radiation being derived from a common source; (ii) a multi-element detector; and (iii) one or more optics configured to image the interference pattern onto the detector so that different elements of the detector correspond to different illumination angles of the test surface by the test electromagnetic radiation. The apparatus is configured to operate in a first mode in which the combined ...Comment on Article Mentions: Zygo Peter J. De Groot
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Optical Coherence Tomography Phase Measurement of Transient Changes in Squid Giant Axons During Activity
Explore Article SpringerLink Home (Oct 6 2009) Other Non-Medical
Noncontact optical measurements reveal that transient changes in squid giant axons are associated with action potential propagation and altered under different environmental (i.e., temperature) and physiological (i.e., ionic concentrations) conditions. Using a spectral-domain optical coherence tomography system, which produces real-time cross-sectional images of the axon in a nerve chamber, axonal surfaces along a depth profile are monitored. Differential phase analyses show transient changes around the membrane on a millisecond timescale, and the response is coincident with the arrival of the action potential at the optical measurement area. Cooling the axon slows the electrical and optical responses and increases the magnitude ...Comment on Article Mentions: University of Minnesota Taner Akkin University of Miami
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DOCT imaging of cytoplasm shuttle flow in Physarum polycephalum
Explore Article Optical Coherence Tomography News (Oct 3 2009) Other Non-Medical , Doppler
Feature Of The Week 10/4/09: Recently scientists from the University of Oulu and Lomonosov Moscow State University demonstrated a novel use of OCT in studity slime mold. The autors Dr. Alexander V. Bykov, Dr. Alexander V. Priezzhev, Mr. Janne Lauri, and Dr. Risto Myllylä revealed in their study the potential possibilities provided by OCT and Doppler OCT techniques for characterization of the complex autowave amoeboid type of the cellular motility of the slime mold Physarum polycephalum in the plasmodium phase of the life cycle. Such type of motility includes cyclic contractions of the gel-like walls of the plasmodial strands. These ...
Comment on Article Mentions: Janne Lauri Risto A. Myllylä University of Oulu
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Holographic live-tissue imaging uses photorefractive polymer
Explore Article Laser Focus World (Oct 2 2009) Other Non-Medical
Collection of three-dimensional (3-D) data from confocal scanning microscopy and optical coherence tomography (OCT) is lengthy due to the sequential acquisition of image pixels required for these methods; for this reason, researchers at the University of Cologne (Cologne, Germany) and Purdue University (West Lafayette, IN) are pursuing a variation of holographic optical coherence imaging (HOCI) as a faster depth-resolved imaging technique.1 Because the whole image is formed in one step, lengthy point scanning is avoided. However, another major obstacle for any tissue-imaging system is light scattering and its impact on image resolution. To combat this concern, the research team implemented ...
Comment on Article Mentions: Purdue University University of Cologne
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Collective Dynamics of Swimming Bacteria: OCT Studies
Explore Article Optical Coherence Tomography News (Sep 27 2009) Other Non-Medical
Feature Of The Week 9/27/09: Physical mechanisms governing large-scale organization of self-propelled biological microparticles, such as motor proteins, swimming bacteria, and other motile cells, attract significant attention among physicists and biologists. Scientists from Argonne National Laborato
Comment on Article Mentions: Imalux Felix I. Feldchtein Igor Aranson
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Bacteria Give Stirring Performance
Explore Article Physical Review Focus (Sep 11 2009) Other Non-Medical
Like flocking birds and swarming locusts, swimming bacteria will coordinate their motion when highly concentrated. A team has now developed a technique that can capture a three-dimensional snapshot of the density of these cooperating bacteria inside a thin film of fluid. The results, reported in the September Physical Review E, show the rising and falling of bacterial plumes, which may help to increase the bacteria's access to oxygen. The work could improve understanding of cooperative bacterial behavior and could also help researchers design better micro-mixers. Collective motion has been observed throughout biology from sperm cells to wildebeests. Swimming bacteria, such ...
Comment on Article Mentions: Felix I. Feldchtein Igor Aranson Argonne National Laboratory
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Enhanced mixing and spatial instability in concentrated bacterial suspensions
Explore Article Scitation (Sep 10 2009) Other Non-Medical
High-resolution optical coherence tomography is used to study the onset of a large-scale convective motion in free-standing thin films of adjustable thickness containing suspensions of swimming aerobic bacteria. Clear evidence is found that beyond a threshold film thickness there exists a transition from quasi-two-dimensional collective swimming to three-dimensional turbulent behavior. The latter state, qualitatively different from bioconvection in dilute bacterial suspensions, is characterized by enhanced diffusivities of oxygen and bacteria. These results emphasize the impact of self-organized bacterial locomotion on the onset of three-dimensional dynamics, and suggest key ingredients necessary to extend standard models of bioconvection to incorporate effects of ...Comment on Article Mentions: Felix I. Feldchtein Imalux Igor Aranson
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Laser Processing Apparatus For Monitoring Processing State By Using Optical Coherence Tomography Technology (Wo 2009/096750)
Explore Article wipo.int (Aug 6 2009) NDE/NDT , Other Non-Medical , Patents
Disclosed is a laser processing apparatus for monitoring a processing state by using optical coherence tomography technology. The disclosed laser processing apparatus comprises: a processing unit that disrupts the molecular binding of a workpiece by using a femtosecond laser beam; a tomographic monitoring unit that monitors a three-dimensional state of the workpiece; and a controller that controls the output of femtosecond laser beam by using a three-dimensional tomographic image. The laser processing apparatus may further include a surface monitoring unit which monitors a surface state of the workpiece. The laser processing apparatus enables active control over its whole processes since ...
Comment on Article Mentions: Gwangju Institute of Science and Technology
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Dear Prof. Dr. Gary S. Mintz, You are an extraordinary expert in imaging, an intelligence ...
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