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Non-invasive Pearl Assessment Device (Moptim OSG-1000 System)
YouTube (Jun 29 2008)
Microscopy,
Non-Medical
Video of Moptim OSG-1000 System imaging Gems.
Holography, tomography and 3D microscopy as linear filtering operations
Institute of Physics (May 22 2008)
Microscopy,
Non-Medical
In this paper, we characterize 3D optical imaging techniques as 3D linear shift-invariant filtering operations. From the Helmholtz equation that is the basis of scalar diffraction theory, we show that the scattered field, or indeed a holographic reconstruction of this field, can be considered to be the result of a linear filtering operation applied to a source distribution. We note that if the scattering is weak, the source distribution is ...
Optical tomography and digital holography
Institute of Physics (May 22 2008)
Non-Medical
Editorial: The articles in this special feature in Measurement Science and Technology concern exciting new developments in the field of digital holography—the process of electronically recording and numerically reconstructing an optical field [1]. Making use of the enormous advances in digital imaging and computer technology, digital holography is presented in a range of applications from fluid flow measurement and structural analysis to medical imaging.
Investigation of polymer and polymer/fibre composite materials with optical coherence tomography
Institute of Physics (May 22 2008)
Non-Medical
Optical coherence tomography (OCT), a technique originally proposed for applications in the field of biomedical diagnostics, is shown to be an efficient measurement technique for a multitude of problems posed in technical engineering and material research. Especially advanced OCT modifications, involving ultrahigh-resolution (UHR) imaging and fast Fourier-domain (FD) techniques, show promising potential, as successfully demonstrated in this paper by a variety of applications from the field of polymer materials. Thin ...
Optoelectronic Applications: Nondestructive Testing - Laser-based instrumentation sheds new light on old artLaser Focus World (May 13 2008)
Non-Medical
Imagine having the opportunity to stand before the Mona Lisa — sans her plexiglass cage, up close and personal, in the basement of the Louvre — and bathe her in coherent blue light, hoping to discover the secrets behind that infamous smile. What minerals and dyes might the pigment contain? What binding agents were used? How much does the final painting differ from the original sketch underneath, and how many ...
Optical coherence tomography picorheology of biopolymer solutions
Scitation (May 2 2008)
Non-Medical
Ramesh C. Sharma, Aristeidis Papagiannopoulos, and Thomas A. Waigh We describe an interferometric optical fiber based dynamic light scattering technique to study the linear viscoelasticity of complex fluids. This digital correlator based method enables viscoelasticity to be probed at high frequencies (1010 Hz) over picoliter regions of an aqueous sample. We demons ... [Appl. Phys. Lett. 92, 173903 (2008)] published Fri May 2, 2008.
Workshop on Optical Coherence Tomography for Examination of Art, Torun, Poland 3-5 July 2008
OCT for Art (Mar 23 2008)
Non-Medical
Torun, Poland 3-5 July 2008. The workshop is devoted to a new optical diagnostic method: Optical Coherence Tomography, which originates from medicine but was later adopted to examination of objects of art for conservation and inventory purposes. The technique is 100% non-contact and non-invasive and since its implementation in 2003 was successfully used to investigate such objects as: paintings, jade artifact, porcelain and faience, glass and parchment. However, it is ...
Optical coherence tomography in art diagnostics and restoration
SpringerLink Home (Mar 21 2008)
Non-Medical
Abstract An overview of the technique of optical coherence tomography (OCT) is presented, and a spectral OCT instrument especially designed for art diagnostics is described. The applicability of OCT to the stratigraphy of oil paintings is discussed with emphasis on examination of the artist’s signature. For the first time, OCT tomograms of stained glass are presented and discussed. The utilisation of Spectral OCT in real-time monitoring of varnish ablation is discussed ...
Ultrahigh-Resolution Transversal Polarization-Sensitive Optical Coherence Tomography: Structural Analysis and Strain-Mapping
SpringerLink Home (Jan 11 2008)
Non-Medical
Abstract Optical coherence tomography (OCT), originally developed and so far nearly exclusively used for biomedical applications (e.g., [1,2]), is a contact-free, non-destructive technique based on low-coherence interferometry to image structures within translucent and turbid materials. Commonly, cross-sectional reflectivity images with a depth-resolution determined by the coherence length of the near-infrared light source are obtained. When OCT is performed in a polarization sensitive way (PS-OCT), additional information about birefringence within a ...
Confocal enhanced optical coherence tomography for nondestructive evaluation of paints and coatings.
NCBI HomePage (Dec 15 2007)
Microscopy,
Non-Medical
Opt Lett. 1999 Dec 15;24(24):1808-10 Authors: Xu F, Pudavar HE, Prasad PN, Dickensheets D We investigate confocal enhanced optical coherence tomography as a nondestructive evaluation tool for imaging with improved image contrast and depth resolution through a highly scattering paint layer. The depth responses provided by confocal microscopy, optical coherence tomography, and confocal enhanced optical coherence tomography for imaging through paint are investigated. We demonstrate that a new combination of ...
Laser imaging beats the bends
optics.org (Nov 21 2007)
Non-Medical
A laser-based system can diagnose decompression sickness in seconds, before the onset of physical symptoms.
IIT scientists develop superfast laser fingerprint scanner
The Economic Times (Nov 17 2007)
Non-Medical
17 Nov, 2007, 1800 hrs IST, AGENCIES Print Save EMail Write to Editor LONDON: Two scientists from the Indian Institute of Technology (IIT) in New Delhi have developed a portable device that can scan fingerprints in microseconds. Satish Kumar Dubey and Dalip Singh Mehta, who developed the device, have revealed that the system works using a technique called optical coherence tomography. The scientist duo insists that the invention
IIT Delhi scientists develop superfast laser fingerprint scanner
Indians in Thailand (Nov 17 2007)
Non-Medical
November 17th, 2007 - 1:50 pm ICT by admin London, November 17 (ANI): Two scientists from the Indian Institute of Technology (IIT) in New Delhi have developed a portable device that can scan fingerprints in microseconds. Satish Kumar Dubey and Dalip Singh Mehta, who developed the device, have revealed that the system works using a technique called optical coherence tomography. The scientist duo insists that the invention promises t
Comparison of three-dimensional optical coherence tomography and high resolution photography for art conservation studies
opticsinfobase.org (Nov 16 2007)
Non-Medical
Desmond C. Adler, Jens Stenger, Iwona Gorczynska, Henry Lie, Teri Hensick, Ron Spronk, Stephan Wolohojian, Narayan Khandekar, James Y. Jiang, Scott Barry, Alex E. Cable, Robert Huber, James G. Fujimoto. Gold punchwork and underdrawing in Renaissance panel paintings are analyzed using both three-dimensional swept source / Fourier domain optical coherence tomography (3D-OCT) and high resolution digital photography. 3D-OCT can generate en face images with micrometer-scale resolutions at arbitrary ... [Opt. ...
Laser fingerprint scanner does away with dusting
technology.newscientist.com (Nov 16 2007)
Non-Medical
A portable device that could scan fingerprints in microseconds has been developed by scientists in India. The system, which works using a technique called optical coherence tomography, promises to be better than existing fingerprint detection methods since it does not require any chemical processing. Optical coherence tomography (OCT) is like an optical version of ultrasound imaging. The technique is already routinely used in medicine, but has not had a forensic ...
Optical coherence diagnostics for painting conservation
SPIE Digital Library (Jul 16 2007)
Non-Medical
Raffaella Fontana, Marco Bellini, Chiara Corsi et al. One of the most important and sometimes controversial stages of the conservation process is surface cleaning: decisions have to be made regarding partial or complete removal of varnish. Technical considerations include selection of a method that allows a great deal of control in the cleaning process ... [Proc. SPIE Int. Soc. Opt. Eng. 6618, 661808 (2007)] published Mon Jul 16, 2007.
Optical coherence tomography for art conservation and archaeology
SPIE Digital Library (Jul 16 2007)
Non-Medical
Haida Liang, Borislava Peric, Michael Hughes et al. Optical coherence tomography (OCT) is a fast scanning Michelson interferometer originally designed for in vivo imaging of the eye. In 2004, our group along with two other groups first reported the application of OCT to art conservation and archaeology. Since that time we have been conducting a proje ... [Proc. SPIE Int. Soc. Opt. Eng. 6618, 661805 (2007)] published Mon Jul 16, ...
Optical coherence tomography: non-destructive imaging and spectral information of pigments
SPIE Digital Library (Jul 16 2007)
Non-Medical
Gael Latour, Julien Moreau, Mady Elias et al. Optical Coherence Tomography (OCT) is a non-invasive and non-destructive technique which is very interesting for the study of works of art. Based on a Michelson interferometer, our device has been adapted for the recording of information in the visible range. This system allows three-dimensional ima ... [Proc. SPIE Int. Soc. Opt. Eng. 6618, 661806 (2007)] published Mon Jul 16, 2007.
Beyond biomedicine: a review of alternative applications and developments for optical coherence tomography
SpringerLink Home (Jun 28 2007)
Non-Medical
Optical coherence tomography (OCT), a method for depth-resolved imaging within turbid media based on the concept of low-coherence interferometry, rapidly evolved in the recent years with the development of a multitude of new functionalities and modalities. Biomedical research and diagnostics have been up to now the main driving forces for the reported applications and progress in OCT. The characteristics of OCT, precisely the ability to provide high-resolution images in a ...
Efficient optical coherence tomography (oct) system and method for rapid imaging in three dimensions
PatFT, AppFT (Dec 5 2006)
Non-Medical,
Patents
An optical coherence tomography (OCT) system including a polarizing splitter disposed to direct light in an interferometer such that the OCT detector operates in a noise-optimized regime. When scanning an eye, the system detector simultaneously produces a low-frequency component representing a scanning laser ophthalmoscope-like (SLO-like) image pixel and a high frequency component representing a two-dimensional (2D) OCT en face image pixel of each point. The SLO-like image is unchanging with ...
En-face optical coherence tomography – a novel application of non-invasive imaging to art conservationopticsinfobase.org (Aug 8 2005)
Non-Medical
Optical Coherence Tomography (OCT) is an optical interferometric technique developed mainly for in vivo imaging of the eye and biological tissues. In this paper, we demonstrate the potential of OCT for non-invasive examination of museum paintings. Two en-face scanning OCT systems operating at 850 nm and 1300 nm were used to produce B-scan and C-scan images at typical working distances of 2 cm. The 3D images produced by the OCT ...