Depth-resolved holography through turbid media using photorefraction

Hyde, S.C.W.; Jones, Richard W.; Barry, Nicolas P. E.; Dainty, J. C.; French, Paul M. W.; Kwolek, K. M.; Nolte, D. D.; Melloch, M. R.

doi:10.1109/2944.577323

Cited by 46 publications

(28 citation statements)

References 32 publications

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“…Hyde and others 4 suggest the use of four criteria to assess the performance of imaging systems, namely resolution, sensitivity, dynamic range and image acquisition time. In the case of our phase transition displacement technique, we have given priority to sensitivity as the most important of these criteria.…”

Section: Comparison Of Resultsmentioning

confidence: 99%

“…In biomedical imaging, performance is hampered by the complicated scattering properties of human tissue 3 , and coherence detection methods are employed, among others, to form an image of sub-surface layers of tissue. The coherence-based methods used in biomedical imaging are usually classified 3,4 into optical heterodyne detection 3 , holographic methods, including photorefractive holography 4 , and optical coherence tomography 5 . Unconventional, coherence-based imaging processes with envisaged application in imaging through a scattering medium have also been described 6 .…”

Section: Introductionmentioning

confidence: 99%

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<title>High-dynamic-range imaging optical detectors</title>

2002

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Imaging spectrometers allowing spatially resolved targets to be spectrally discriminated are valuable for remote sensing and defense applications. The drawback of such instruments is the need to quickly process very large amounts of data. In this paper we demonstrate two imaging systems which detect a dim target in a bright background, using the coherence contrast between them, generating much less data but only operating over a limited optical bandwidth. Both systems use a passband filter, a Michelson interferometer, coupling optics and a CCD camera. The first uses the interferometer in a spatial mode, by tilting one of the mirrors to create a set of line fringes on the CCD array. The visibility of these fringes is proportional to the degree of coherence. The interferogram is displayed spatially on the CCD array, as a function of the path differences. The second system uses the interferometer in a temporal mode. A coherent point target and an extended background are imaged through the interferometer onto the CCD array, and one of the interferometer's mirrors is scanned longitudinally to vary the path difference in time. In both cases the coherent target is detected over a large dynamic range down to negative signal-to-background power ratios (in dB). The paper describes an averaging technique to improve the signal-to-noise ratio and correction techniques required to extract interferograms from the images. The spatial technique developed has the advantage of using no moving parts.

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Section: Comparison Of Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

<title>High-dynamic-range imaging optical detectors</title>

2002

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“…In general we note that as the scattering depth of the obscuring phantom is increased, the signal to noise ratio of the reconstructed image is degraded but the spatial resolution is maintained. The physics underlying the ability of our photorefractive holographic technique to image through turbid media has been discussed in depth in reference [9]. Scattered light which has an extra pathlength of less than the coherence length will instantaneously write unwanted fringes which are averaged over the finite acquisition time of the holographic recording medium.…”

Section: Depth-resolved Imaging Through Turbid Mediamentioning

confidence: 99%

Direct-to-video holographic 3-D imaging using photorefractive multiple quantum well devices

Jones¹,

Tziraki²,

French³

et al. 1998

Opt. Express

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Customised photorefractive quantum well devices have been developed for real-time video acquisition of coherence-gated, threedimensional images. Holographic imaging with direct video capture has been demonstrated. The technique has been applied to 3-D imaging through turbid media with 50 µm transverse and 60 µm depth resolution being achieved using near infrared light through a phantom of 13 mean free paths scattering depth. Spectrally-resolved holographic imaging has also been demonstrated.

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“…Several coherent imaging methods that function through scattering media by extracting unscattered ballistic light from a diffuse scattered background, 1,2 such as optical coherence tomography (OCT), 3 heterodyne detection, 4 and electronic 5 and photorefractive holography, 6,7 have been reported. Specifically, three-dimensional images are constructed by axially scanning the interferometer path difference between the object and the reference beams.…”

Section: Introductionmentioning

confidence: 99%

Coherence Gated Three-dimensional Imaging System using Organic Photorefractive Holography

Hwang¹,

Choi²,

Kim³

et al. 2014

Bulletin of the Korean Chemical Society

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This paper discusses a coherence-gated three-dimensional imaging system based on photorefractive holography, which was applied to imaging through turbid media with a view to developing biomedical instrumentation. A rapid response photorefractive device doped with 2,4,7-trinitro-9-fluorenylidene malononitrile was used to generate the hologram grating. The estimated depth resolution was 20 µm, which corresponds to the coherence length of the light source. In this coherence imaging system, tomographic imaging of a 3-dimensional object composed of a 50 µm thick cylindrical layer was achieved. The proposed coherence imaging system using an organic photorefractive material can be used as an optical tomography system for biological applications

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Depth-resolved holography through turbid media using photorefraction

Abstract: Abstract-

Cited by 46 publications

References 32 publications

<title>High-dynamic-range imaging optical detectors</title>

<title>High-dynamic-range imaging optical detectors</title>

Direct-to-video holographic 3-D imaging using photorefractive multiple quantum well devices

Coherence Gated Three-dimensional Imaging System using Organic Photorefractive Holography

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