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OCT Products in the News
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(7 articles) University of Oulu
(5 articles) Moscow State University
(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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Jade detection and analysis based on optical coherence tomography images
Explore Article SPIE Digital Library (Jun 15 2010)
Optical coherence tomography is a fundamentally new type of optical sensing technology that can perform high-resolution, cross sectional sensing of the internal structure of materials and biological samples. This work briefly describes its capability of exploring and analyzing the internal structures and textures of various jades. With a depth resolution of 4 µm in jade and penetration range of 5 mm in jade, swept-source OCT could be used as a new powerful instrument to generate 3-D volume data of jade, which is important for applications in jade industry and artwork, particularly for jade detection and classification, counterfeit recognition, and guided ...
Comment on Article Mentions: Shoude Chang Costel Flueraru National Research Council Canada
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Evaluating and identifying pearls and their nuclei by using optical coherence tomography
Explore Article opticsinfobase.org (Jun 8 2010)
Optical coherence tomography (OCT) has been utilized to evaluate pearls including their nuclei noninvasively. By visualizing the internal structure of a pearl, we could measure the thickness of its nacre layer, observe the fine sub-structure of the nacre, and inspect the nucleus through the nacre. The system also allowed us to classify pearls into beaded- and non-beaded ones; usually, the saltwater ones have nuclei even though there are beaded freshwater pears and non-beaded saltwater pearls. Any cracks, crevices, or blemishes not only in the nacre but in the nucleus of a pearl could be clearly visualized. The OCT system was ...
Comment on Article Mentions: Byeong Ha Lee Eunjung Min Gwangju Institute of Science and Technology
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Optical coherence tomography as an accurate inspection and quality evaluation technique in paper industry
Explore Article SpringerLink Home (Jun 4 2010)
Optical coherence tomography (OCT), a technique for the noninvasive imaging of turbid media, based on low-coherence interferometry, was originally developed for the imaging of biological tissues. Since the development of the technique, most of its applications have been related to the area of biomedicine. However, from early stages, the vertical resolution of the technique has already been improved to a submicron scale. This enables new possibilities and applications. This article presents the possible applications of OCT in paper industry, where submicron or at least a resolution close to one micron is required. This requirement comes from the layered structure of ...
Comment on Article Mentions: Risto A. Myllylä University of Oulu Erkki Alarousu
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Optical coherence tomography as a method of quality inspection for printed electronics products
Explore Article SpringerLink Home (Jun 4 2010)
Application of time domain, ultra high resolution optical coherence tomography (UHR-OCT) in printed electronics products’ quality inspection is demonstrated. Presented study was done using experimental UHR-OCT device based on a Kerr-lens mode locked Ti:sapphire femtosecond laser, photonic crystal fibre and modified, free-space Michelson interferometer. Possibilities of the technique are demonstrated by analysis of an RF antenna—example of printed electronics products. Measurements were done with submicron axial resolution, offered by UHR-OCT system developed in our laboratory. Such high resolution is necessary due to the thickness of material layers used in printed electronics. In addition to tomography imaging, numerical results were compared ...
Comment on Article Mentions: Risto A. Myllylä University of Oulu Erkki Alarousu
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System and method for determining crosswinds
Explore Article uspto.gov (Apr 27 2010)
A system and method for measuring crosswinds includes using a laser to send a signal on a signal path, and receiving response signals backscattered off of aerosols or other materials in the atmosphere along the signal path. Wavefronts of the received responses are perturbated by thermal cell turbulence in the atmosphere that perturbs optical wavefront propagation. Signals backscattered by airborne aerosols at different distances from the laser in the wavefront imager arrive at different times at the wavefront imager. Thus the wavefront perturbations vary with range, and data on the perturbed wavefront may be collected by the wavefront imager. Crosswinds ...
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Optical coherence tomography for process control of laser micromachining
Explore Article Review of Scientific Instruments (Mar 24 2010)
In situ surface imaging for nondestructive evaluation (NDE) by optical coherence tomography (OCT) before, during, and after ablative laser processing is presented. Furthermore, it is shown that the ability of in situ characterization is beneficial for samples such as optical fibers, which are difficult to handle in the standard analysis. Surface images taken by the OCT are compared with these common analysis tools such as scanning electron microscopy (SEM), reflected-light, and confocal microscopy. An axial resolution of ∼ 126 nm for surface detection and a lateral resolution <2.5 μm are obtained and the potential of the setup to imaging structures ...
Comment on Article Mentions: Gereon Hüttmann University of Lübeck
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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)
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)
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)
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)
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)
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)
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 uspto.gov (Nov 17 2009)
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 ...Comment on Article Mentions: FDA
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Interferometer with multiple modes of operation for determining characteristics of an object surface
Explore Article uspto.gov (Nov 10 2009)
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)
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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Great video Jim!
dariemihaela » Gary S. Mintz
Dear Prof. Dr. Gary S. Mintz, You are an extraordinary expert in imaging, an intelligence ...
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