Dr. Alain Blouin Profile

Dr. Alain Blouin

Research Officer at National Research Council Canada

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Publications (16)

Proceedings Article | 8 November 2020 Presentation + Paper

Standoff mid-infrared reflectance spectroscopy using quantum cascade laser for mineral identification

Anaïs Parrot, Francis Vanier, Alain Blouin

Proceedings Volume 11525, 1152513 (2020) https://doi.org/10.1117/12.2579900

KEYWORDS: Quantum cascade lasers, Minerals, Reflectance spectroscopy, Mid-IR, Silicates, Statistical analysis, Quartz, Mining, Distance measurement, Carbonates

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Proceedings Article | 11 April 2013 Paper

Multi-element, high-temperature integrated ultrasonic transducers for structural health monitoring

Jocelyn Veilleux, Silvio Kruger, Kuo-Ting Wu, Alain Blouin

Proceedings Volume 8693, 86930I (2013) https://doi.org/10.1117/12.2009868

KEYWORDS: Multi-element lenses, Transducers, Ultrasonics, Sol-gels, Structural health monitoring, Electrodes, Composites, Ferroelectric materials, Ultrasonography, Chemical elements

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SPIE Journal Paper | 7 May 2012 Open Access

Non-contact biomedical photoacoustic and ultrasound imaging

Guy Rousseau, Bruno Gauthier, Alain Blouin, Jean-Pierre Monchalin

JBO, Vol. 17, Issue 6, 061217, (May 2012) https://doi.org/10.1117/12.10.1117/1.JBO.17.6.061217

KEYWORDS: Tissue optics, Ultrasonography, Natural surfaces, Biomedical optics, Tissues, Ultrasonics, Photoacoustic spectroscopy, Brain, Laser safety, Absorption

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Proceedings Article | 5 April 2012 Paper

A multi-point ultrasonic detection approach to fretting crack detection in an aircraft component

Kuo-Ting Wu, Zhigang Sun, Cheng-Kuei Jen, Alain Blouin, Nezih Mrad, Hugo Bélanger

Proceedings Volume 8347, 834710 (2012) https://doi.org/10.1117/12.915382

KEYWORDS: Acoustics, Transducers, Sensors, Ultrasonics, Diagnostics, Wave plates, Inspection, Adhesives, Spatial resolution, Signal processing

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Proceedings Article | 23 February 2012 Paper

Non-contact photoacoustic tomography and ultrasonography for biomedical imaging

Guy Rousseau, Daniel Lévesque, Alain Blouin, Jean-Pierre Monchalin

Proceedings Volume 8223, 82231C (2012) https://doi.org/10.1117/12.906874

KEYWORDS: Tissues, Ultrasonography, Ultrasonics, Tissue optics, Natural surfaces, Biomedical optics, Laser safety, Breast, Acquisition tracking and pointing, Blood vessels

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Proceedings Article | 9 February 2012 Paper

Non-contact photoacoustic tomography and ultrasonography for brain imaging

Guy Rousseau, Alain Blouin, Jean-Pierre Monchalin

Proceedings Volume 8207, 820750 (2012) https://doi.org/10.1117/12.906871

KEYWORDS: Tissues, Ultrasonography, Tissue optics, Laser safety, Natural surfaces, Ultrasonics, Brain, Biomedical optics, Acquisition tracking and pointing, Blood vessels

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Proceedings Article | 24 February 2010 Paper

Spatial resolution of ultrasound-modulated optical tomography used for the detection of absorbing and scattering objects in thick scattering media

Guy Rousseau, Alain Blouin, Jean-Pierre Monchalin

Proceedings Volume 7564, 75642A (2010) https://doi.org/10.1117/12.841828

KEYWORDS: Ultrasonics, Ultrasound-modulated optical tomography, Scattering, Laser scattering, Modulation transfer functions, Photons, Spatial resolution, Solids, Point spread functions, Scattering media

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Proceedings Article | 12 February 2009 Paper

Ultrasound-modulated optical imaging using a confocal Fabry-Perot interferometer and a powerful long pulse laser

Guy Rousseau, Alain Blouin, Jean-Pierre Monchalin

Proceedings Volume 7177, 71771E (2009) https://doi.org/10.1117/12.807960

KEYWORDS: Photons, Scattering, Laser scattering, Acoustics, Ultrasonics, Signal to noise ratio, Ultrasonography, Biomedical optics, Optical imaging, Transducers

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Proceedings Article | 12 February 2009 Paper

Ultrasound-modulated optical imaging using a photorefractive interferometer and a powerful long pulse laser

Guy Rousseau, Alain Blouin, Jean-Pierre Monchalin

Proceedings Volume 7177, 71771D (2009) https://doi.org/10.1117/12.807954

KEYWORDS: Scattering, Laser scattering, Interferometers, Photons, Acoustics, Ultrasonics, Transducers, Pulsed laser operation, Breast, Biomedical optics

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Proceedings Article | 11 August 2008 Paper

Acousto-optical imaging using a powerful long pulse laser

Guy Rousseau, Alain Blouin, Jean-Pierre Monchalin

Proceedings Volume 7099, 709902 (2008) https://doi.org/10.1117/12.804506

KEYWORDS: Ultrasonics, Photons, Interferometers, Crystals, Pulsed laser operation, Transducers, Acoustics, Optical amplifiers, Scattering, Ultrasonography

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Acousto-optical imaging is an emerging biodiagnostic technique which provides an optical spectroscopic signature and a spatial localization of an optically absorbing target embedded in a strongly scattering medium. The transverse resolution of the technique is determined by the lateral extent of ultrasound beam focal zone while the axial resolution is obtained by using short ultrasound pulses. Although very promising for medical diagnostic, the practical application of this technique is presently limited by its poor sensitivity. Moreover, any method to enhance the signal-to-noise ratio must obviously satisfy the in vivo safety limits regarding the acceptable power level of both the ultrasonic pressure wave and the laser beam. In this paper, we propose to improve the sensitivity by using a pulsed single-frequency laser source to raise the optical peak power applied to the scattering medium and to collect more ultrasonically tagged photons. Such a laser source also allows illuminating the tissues mainly during the transit time of the ultrasonic wave to maintain the average optical power below the maximum permissible exposure. In our experiment, a single-frequency Nd:YAG laser emitting 500-μs pulses with a peak power superior to 100 W was used. Photons were tagged in few-cm thick optical phantoms with tone bursts generated by an ultrasonic transducer. Tagged photons were detected with a GaAs photorefractive interferometer characterized by a large optical etendue to process simultaneously a large number of speckle grains. When pumped by high intensity laser pulses, such an interferometer also provides the fast response time essential to obtain an apparatus insensitive to the speckle decorrelation due to mechanical vibrations or tissues movements. The use of a powerful long pulse laser appears promising to enhance the signal level in ultrasound modulated optical imaging. When combined with a photorefractive interferometer of large optical etendue, such a source could allow obtaining both the sensitivity and the fast response time necessary for biodiagnostic applications.

Proceedings Article | 28 February 2008 Paper

Improvement of sensitivity of acousto-optical imaging using a powerful long pulse laser

Guy Rousseau, Alain Blouin, Jean-Pierre Monchalin

Proceedings Volume 6856, 68561O (2008) https://doi.org/10.1117/12.761667

KEYWORDS: Ultrasonics, Photons, Interferometers, Pulsed laser operation, Acoustics, Crystals, Transducers, Optical amplifiers, Laser crystals, Beam splitters

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Proceedings Article | 15 December 2000 Paper

Laser ultrasonics: a new tool for the industry

Alain Blouin, Marc Choquet, Daniel Levesque, Andre Moreau, Jean-Pierre Monchalin

Proceedings Volume 4087, (2000) https://doi.org/10.1117/12.406355

KEYWORDS: Fabry–Perot interferometers, Ultrasonics, Confocal microscopy, Interferometers, Reflection, Crystals, Inspection, Mirrors, Two wave mixing, Composites

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Proceedings Article | 15 June 2000 Paper

Short response time fiber-coupled photorefractive ultrasonic demodulator

Benjamin Campagne, Alain Blouin, Jean-Pierre Monchalin

Proceedings Volume 4087, (2000) https://doi.org/10.1117/12.406356

KEYWORDS: Crystals, Receivers, Sensors, Fabry–Perot interferometers, Laser crystals, Ultrasonics, Modulation, Signal detection, Interference (communication), Gallium arsenide

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Proceedings Article | 22 September 1997 Paper

Photorefractive detection of ultrasound

Philippe Delaye, Alain Blouin, Louis-Anne de Montmorillon, Denis Drolet, Jean-Pierre Monchalin, Gerald Roosen

Proceedings Volume 3137, (1997) https://doi.org/10.1117/12.287778

KEYWORDS: Crystals, Signal detection, Ultrasonics, Phase conjugation, Sensors, Heterodyning, Beam splitters, Laser crystals, Wavefronts, Ultrasonography

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Proceedings Article | 18 September 1996 Paper

Detection of ultrasonic vibrations on rough surfaces through the photorefractive effect

Philippe Delaye, Alain Blouin, Louis-Anne de Montmorillon, Ivan Biaggio, Denis Drolet, Jean-Pierre Monchalin, Gerald Roosen

Proceedings Volume 2782, (1996) https://doi.org/10.1117/12.250776

KEYWORDS: Signal detection, Photorefraction, Ultrasonics, Wavefronts, Phase conjugation, Heterodyning, Oscillators, Homodyne detection, Mirrors, Ultrasonography

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Proceedings Article | 22 December 1993 Paper

Anisotropy of photoinduced index change in Ge-doped optical fiber

Jocelyn Lauzon, Michel Poirier, Simon Thibault, Sophie LaRochelle, Alain Blouin, Francois Ouellette

Proceedings Volume 2044, (1993) https://doi.org/10.1117/12.165666

KEYWORDS: Polarization, Absorption, Anisotropy, Birefringence, Ultraviolet radiation, Refractive index, Optical fibers, Luminescence, Dielectric polarization, Fiber Bragg gratings

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Showing 5 of 16 publications

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