Dr. Maurice Patrick Whelan Profile

Dr. Maurice Patrick Whelan

at European Commission Joint Research Ctr

SPIE Involvement:

Author

Publications (36)

Proceedings Article | 11 September 2012 Paper

Assessment of a dynamic reference material for calibration of full-field measurement systems

Erwin Hack, Mara Feligiotti, Andrea Davighi, Maurice Whelan, Weizhuo Wang, Eann Patterson

Proceedings Volume 8413, 84130U (2012) https://doi.org/10.1117/12.977950

KEYWORDS: Calibration, Finite element methods, Shape analysis, Holography, Optics manufacturing, Speckle, Speckle interferometry, Optical calibration, Prototyping, Transducers

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SPIE Journal Paper | 1 March 2010 Open Access

Enrichment of hepatocytes in a HepaRG culture using spatially selective photodynamic treatment

Artur Bednarkiewicz, Robim Rodrigues, Maurice Whelan

JBO, Vol. 15, Issue 02, 028002, (March 2010) https://doi.org/10.1117/12.10.1117/1.3369000

KEYWORDS: Ultraviolet radiation, Luminescence, Photodynamic therapy, Microscopes, Digital micromirror devices, In vitro testing, Binary data, Mode conditioning cables, Image processing, Absorption

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Proceedings Article | 20 February 2010 Paper

A heterodyne Mach-Zehnder Interferometer employing static and dynamic phase demodulation techniques for live-cell imaging

Shiju Joseph, Jean-Michel Gineste, Maurice Whelan, David Newport

Proceedings Volume 7554, 75540P (2010) https://doi.org/10.1117/12.843326

KEYWORDS: Heterodyning, Phase shift keying, Interferometers, Phase imaging, Phase measurement, Cameras, Demodulation, Microscopes, Modulation, Signal detection

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Proceedings Article | 10 July 2009 Paper

Light collection from fluorescence-based biochips by holographic diffractive optical elements

Peter Macko, Maurice Whelan

Proceedings Volume 7371, 73711E (2009) https://doi.org/10.1117/12.831730

KEYWORDS: Luminescence, Wavefronts, Holography, Charge-coupled devices, Interfaces, Sensors, Holographic optical elements, Diffractive optical elements, Lithography, Glasses

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SPIE Journal Paper | 1 July 2008 Open Access

Global analysis of microscopic fluorescence lifetime images using spectral segmentation and a digital micromirror spatial illuminator

Artur Bednarkiewicz, Maurice Whelan

JBO, Vol. 13, Issue 04, 041316, (July 2008) https://doi.org/10.1117/12.10.1117/1.2950308

KEYWORDS: Image segmentation, Luminescence, Fluorescence lifetime imaging, Digital micromirror devices, Biological research, Data analysis, Image processing algorithms and systems, Statistical analysis, Fiber optic illuminators, Signal to noise ratio

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SPIE Journal Paper | 1 September 2007

Full-field heterodyne interferometry using a complementary metal-oxide semiconductor digital signal processor camera for high-resolution profilometry

Mauro Aguanno, Fereyduon Lakestani, Maurice Whelan, Michael Connelly

OE, Vol. 46, Issue 09, 095601, (September 2007) https://doi.org/10.1117/12.10.1117/1.2779346

KEYWORDS: Digital signal processing, Mirrors, Heterodyning, Signal processing, Cameras, Interferometry, Signal detection, Phase measurement, Imaging systems, Interferometers

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Proceedings Article | 17 July 2007 Paper

Heterodyne interference microscopy for non-invasive cell morphometry

Maurice Whelan, Fereydoun Lakestani, Diana Rembges, Maria Grazia Sacco

Proceedings Volume 6631, 66310E (2007) https://doi.org/10.1117/12.728449

KEYWORDS: Heterodyning, Microscopes, Microscopy, In vitro testing, Toxicity, Bragg cells, CMOS cameras, Blood, Cameras, Phase measurement

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Proceedings Article | 12 July 2007 Paper

Microscopic fluorescence lifetime and hyperspectral imaging with digital micromirror illuminator

Artur Bednarkiewicz, Maurice Whelan

Proceedings Volume 6630, 66300A (2007) https://doi.org/10.1117/12.728422

KEYWORDS: Luminescence, Image segmentation, Fluorescence lifetime imaging, Digital micromirror devices, Raster graphics, Fiber optic illuminators, Micromirrors, Data analysis, Binary data, Statistical analysis

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Proceedings Article | 11 July 2007 Paper

Spectroscopic imaging using acousto-optic tunable filters

Mounir Bouhifd, Maurice Whelan

Proceedings Volume 6628, 662803 (2007) https://doi.org/10.1117/12.728446

KEYWORDS: Luminescence, Optical filters, Image filtering, Tissues, Crystals, In vivo imaging, In vitro testing, Filtering (signal processing), Imaging spectroscopy, Imaging systems

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SPIE Journal Paper | 1 December 2006 Open Access

Full-field phase measurement by wavelength-tuning interferometry in the C-band

Patrick Egan, Fereyduon Lakestani, Maurice Whelan, Michael Connelly

OE, Vol. 45, Issue 12, 120504, (December 2006) https://doi.org/10.1117/12.10.1117/1.2401169

KEYWORDS: Cameras, Interferometry, Phase measurement, Semiconductor lasers, Mirrors, Phase retrieval, Wavelength tuning, Interferometers, Infrared radiation

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Proceedings Article | 15 September 2006 Paper

Calibration and assessment of full-field optical strain measurement procedures and instrumentation

Malgorzata Kujawinska, E. Patterson, R. Burguete, E. Hack, D. Mendels, T. Siebert, Maurice Whelan

Proceedings Volume 6341, 63410Q (2006) https://doi.org/10.1117/12.695297

KEYWORDS: Calibration, Standards development, Optical testing, Manufacturing, Classification systems, Interferometry, Experimental mechanics, Finite element methods, Optical calibration, Photoelasticity

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Proceedings Article | 14 August 2006 Paper

Novel techniques for random depth access three-dimensional white-light optical metrology

Patrick Egan, Fereydoun Lakestani, Maurice Whelan, Michael Connelly

Proceedings Volume 6292, 629212 (2006) https://doi.org/10.1117/12.678061

KEYWORDS: Interferometry, Phase retrieval, Heterodyning, Mirrors, Cameras, Analog electronics, Optical metrology, Machine vision, Modulation

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Proceedings Article | 9 June 2006 Paper

Replay at optical communications wavelengths of holographic gratings recorded in the visible

Vincent Toal, Maurice Whelan, Alberto Volcan, Izabela Naydenova, Suzanne Martin

Proceedings Volume 6252, 625204 (2006) https://doi.org/10.1117/12.676497

KEYWORDS: Diffraction gratings, Holography, Diffraction, Telecommunications, Visible radiation, Zirconium, Fiber Bragg gratings, Prisms, Reflection, Optical communications

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SPIE Journal Paper | 1 January 2006

Full-field optical coherence tomography with a complimentary metal-oxide semiconductor digital signal processor camera

Patrick Egan, Fereyduon Lakestani, Maurice Whelan, Michael Connelly

OE, Vol. 45, Issue 01, 015601, (January 2006) https://doi.org/10.1117/12.10.1117/1.2158968

KEYWORDS: Cameras, Optical coherence tomography, Digital signal processing, Signal processing, Signal to noise ratio, Semiconductors, Optical signal processing, Optical filters, Light sources, 3D image processing

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Proceedings Article | 13 June 2005 Paper

Full-field low-frequency heterodyne interferometry using CMOS and CCD cameras with online phase processing

Fereydoun Lakestani, Maurice Whelan, Julie Garvey, David Newport

Proceedings Volume 5856, (2005) https://doi.org/10.1117/12.612721

KEYWORDS: Heterodyning, Phase measurement, CMOS cameras, Interferometers, Mirrors, CCD cameras, Interferometry, Liquids, Bragg cells, Beam splitters

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Most full-field heterodyne interferometry systems are based on complex electro-mechanical scanning devices. In this study, however, we present an alternative non-scanning approach based on a low frequency heterodyne interferometer employing standard CCD and CMOS cameras. Two frequency locked acousto-optical devices were used to obtain two laser beams with an optical frequency difference as low as 3 Hz. The interference of those beams generated a suitably low frequency carrier signal that allowed the use of a common 25 frame/second CCD camera. Using a digital CMOS camera and acquiring a limited number of randomly accessible pixels, measurements with much higher carrier frequencies were also possible. The advantages of the heterodyne technique with respect to common phase-stepping methods are the shorter response time and lower sensitivity to sources of uncertainty such as drift, vibrations and random electronic noises. In order to directly compare the heterodyne and phase-stepping techniques experimentally, the same interferometer was used for both methods. The switching between operation modes was achieved by simply altering the electronic driving signals of the acousto-optical devices where for the phase-stepping mode, the frequency difference of the driving signals was set to zero. The phase steps were obtained by a piezo-driven mirror. Comparing the phase difference between two pixels in an image, approximately 0.01 radian of standard deviation, corresponding to a resolution of λ/628, was achieved by heterodyne technique, as compared to 0.06 radian by the phase-stepping method. The interferometer with the CMOS camera was applied to monitor the refractive index variation across a micro-channel where two liquid flows were mixed. Also, the capability for fast, time-resolved full-field optical refractive index measurements was demonstrated. The examples presented show how the high sensitivity of the heterodyne technique allows the study of a number of sources of uncertainty that were not otherwise easily quantifiable using standard full field methods.

Proceedings Article | 13 June 2005 Paper

Three-dimensional machine vision utilising optical coherence tomography with a direct read-out CMOS camera

Patrick Egan, Fereydoun Lakestani, Maurice Whelan, Michael Connelly

Proceedings Volume 5856, (2005) https://doi.org/10.1117/12.612087

KEYWORDS: Cameras, Optical coherence tomography, Digital signal processing, Machine vision, Signal to noise ratio, Signal processing, Sensors, CMOS sensors, Aluminum, 3D image processing

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Proceedings Article | 13 June 2005 Paper

Recent issues on development of reference materials and standardized tests of optical methods of strain measurement

Richard Burguete, Erwin Hack, Malgorzata Kujawinska, Eann Patterson, Leszek Salbut, Quasim Saleem, Thorsten Siebert, Maurice Whelan

Proceedings Volume 5856, (2005) https://doi.org/10.1117/12.621586

KEYWORDS: Standards development, Calibration, Optical testing, Optics manufacturing, Interferometry, Photoelasticity, Prototyping, Optical design, Design for manufacturability, Transducers

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Proceedings Article | 3 June 2005 Paper

Fluorescence imaging spectroscopy utilising acousto-optic tuneable filters

Mounir Bouhifd, Maurice Whelan, Marc Aprahamian

Proceedings Volume 5826, (2005) https://doi.org/10.1117/12.605088

KEYWORDS: Luminescence, Image filtering, Optical filters, Endoscopes, Microscopes, Crystals, Imaging systems, In vivo imaging, Image processing, Acousto-optics

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Proceedings Article | 1 June 2005 Paper

Direct read-out CMOS camera with applications to full-field optical coherence tomography

Patrick Egan, Fereydoun Lakestani, Maurice Whelan, Michael Connelly

Proceedings Volume 5823, (2005) https://doi.org/10.1117/12.601003

KEYWORDS: Cameras, Digital signal processing, Optical coherence tomography, Signal processing, Glasses, CMOS sensors, Signal to noise ratio, CMOS cameras, Coherence (optics), Sensors

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Proceedings Article | 1 April 2005 Paper

Use of acousto-optic tuneable filters for imaging fluorescence spectroscopy applications in vivo and in vitro

Mounir Bouhifd, Maurice Whelan, Marc Aprahamian

Proceedings Volume 5692, (2005) https://doi.org/10.1117/12.589287

KEYWORDS: Luminescence, Image filtering, Optical filters, Endoscopes, Crystals, In vivo imaging, Microscopes, Imaging systems, Fluorescence spectroscopy, Prototyping

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Proceedings Article | 2 August 2004 Paper

Development of standard measurement chain for full-field optical strain measurement methods

Leszek Salbut, Malgorzata Kujawinska, Eann Patterson, Erwin Hack, Richard Burguete, Maurice Whelan, David Mendels

Proceedings Volume 5532, (2004) https://doi.org/10.1117/12.560939

KEYWORDS: Interferometry, Standards development, Calibration, Finite element methods, Optical testing, Fringe analysis, Diffraction gratings, Reverse modeling, Reliability, Phase shifts

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Proceedings Article | 29 July 2004 Paper

Advanced fluorescence imaging endoscopy using an acousto-optic tuneable filter

Maurice Whelan, Mounir Bouhifd, Marc Aprahamian

Proceedings Volume 5486, (2004) https://doi.org/10.1117/12.572045

KEYWORDS: Luminescence, Image filtering, Optical filters, Endoscopes, Imaging systems, Tissues, Prototyping, In vivo imaging, Endoscopy, Filtering (signal processing)

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Proceedings Article | 22 June 2004 Paper

Simple shearing interferometer suitable for vibration measurements

Emilia Mihaylova, Maurice Whelan, Vincent Toal

Proceedings Volume 5503, (2004) https://doi.org/10.1117/12.579541

KEYWORDS: Glasses, Phase shifts, Shearing interferometers, Vibrometry, Shearography, Modal analysis, Interferometry, Fringe analysis, Reflectivity, Control systems

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Proceedings Article | 19 February 2004 Paper

Single-pixel carrier-based approach for full-field laser interferometry using a CMOS-DSP camera

Mauro Aguanno, Fereydoun Lakestani, Maurice Whelan, Michael Connelly

Proceedings Volume 5251, (2004) https://doi.org/10.1117/12.532651

KEYWORDS: Cameras, Digital signal processing, Vibrometry, Doppler effect, Mirrors, Demodulation, Imaging systems, Heterodyning, CMOS sensors, Interferometers

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Proceedings Article | 14 October 2003 Paper

Use of acousto-optic tunable filter in fluorescence imaging endoscopy

Mounir Bouhifd, Maurice Whelan, Marc Aprahamian

Proceedings Volume 5143, (2003) https://doi.org/10.1117/12.500700

KEYWORDS: Luminescence, Optical filters, Image filtering, Endoscopes, Crystals, In vivo imaging, Imaging systems, Tissues, Filtering (signal processing), Endoscopy

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Proceedings Article | 27 June 2002 Paper

Remote structural monitoring of the Cathedral of Como using an optical fiber Bragg sensor system

Maurice Whelan, Daniel Albrecht, Antonio Capsoni

Proceedings Volume 4694, (2002) https://doi.org/10.1117/12.472625

KEYWORDS: Sensors, Demodulation, Data acquisition, Temperature metrology, Optical fibers, Structural monitoring, Prototyping, Fiber Bragg gratings, Optoelectronics, Software development

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Proceedings Article | 27 June 2002 Paper

Condition monitoring of vibrating composite structures based on optical fiber strain sensing and finite element model updating

Giorgio Nosenzo, Maurice Whelan, Tara Dalton

Proceedings Volume 4694, (2002) https://doi.org/10.1117/12.472610

KEYWORDS: Sensors, Composites, Finite element methods, Modal analysis, Interferometry, Data modeling, Interferometers, Demodulation, Fabry–Perot interferometers, Optical fibers

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Proceedings Article | 22 May 2002 Paper

Full-field laser vibrometry employing a novel CMOS-DSP camera

Mauro Aguanno, Michael Connelly, Maurice Whelan

Proceedings Volume 4827, (2002) https://doi.org/10.1117/12.468145

KEYWORDS: Digital signal processing, Cameras, Demodulation, CMOS sensors, Vibrometry, Interferometry, Signal processing, Modulation, CCD cameras, Image processing

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Proceedings Article | 22 May 2002 Paper

Structural integrity analysis of vibrating composite structures based on optical fiber strain sensing and finite element model updating

Giorgio Nosenzo, Maurice Whelan, Tara Dalton

Proceedings Volume 4827, (2002) https://doi.org/10.1117/12.468140

KEYWORDS: Sensors, Composites, Mirrors, Interferometry, Finite element methods, Fabry–Perot interferometers, Interferometers, Modal analysis, Demodulation, Data modeling

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SPIE Journal Paper | 1 October 2001

Digital moire subtraction in optical engineering

Colin Forno, Maurice Whelan

OE, Vol. 40, Issue 10, (October 2001) https://doi.org/10.1117/12.10.1117/1.1402621

KEYWORDS: Interferometers, Interferometry, Mirrors, Spatial frequencies, Optical engineering, Fringe analysis, Error analysis, CCD cameras, Imaging systems, Glasses

Proceedings Article | 9 November 2000 Paper

Novel fibre optic fluid velocity sensor

M. Whelan

Proceedings Volume 4185, 41853A (2000) https://doi.org/10.1117/12.2302261

KEYWORDS: Sensors, Transducers, Optical fibers, Velocity measurements, Lead, Fiber optics, Optoelectronics, Light sources, Demodulation, Wind measurement

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Proceedings Article | 17 August 1999 Paper

Digital moire subtraction applied to interferometers as a means of improving accuracy and extending field of view for engineering and optical measurement

Colin Forno, Maurice Whelan

Proceedings Volume 3745, (1999) https://doi.org/10.1117/12.357806

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Proceedings Article | 13 August 1999 Paper

Illumination systems using photopolymer gratings for speckle interferometry

Maurice Whelan, Colin Forno, Suzanne Martin, Feidhlim O'Neill, Vincent Toal

Proceedings Volume 3744, (1999) https://doi.org/10.1117/12.357758

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Proceedings Article | 27 July 1998 Paper

Optomechanical actuator for adaptive optics

Maurice Whelan, Robert Kenny, Alfredo Lucia

Proceedings Volume 3329, (1998) https://doi.org/10.1117/12.316941

KEYWORDS: Actuators, Prototyping, Sensors, Glasses, Coating, Reflectivity, Interferometry, Holography, Signal detection, Adaptive optics

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Proceedings Article | 2 September 1997 Paper

Fiber optic sensors for characterization of composite structural materials and structural monitoring

Robert Kenny, E. Gutierrez, Alfredo Lucia, Maurice Whelan, F. Gaiazzi

Proceedings Volume 3180, (1997) https://doi.org/10.1117/12.285597

KEYWORDS: Fiber optics sensors, Composites, Structural monitoring, Optical components, Fiber optic components, Adaptive optics, Tunable filters, Demodulation, Fiber Bragg gratings, Sensors

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Proceedings Article | 18 September 1996 Paper

Thin-cavity interferometric sensors for detection of weak radiation flux and microvibrations

Maurice Whelan, Robert Kenny, John Sheridan, Constantin Coutsomitros

Proceedings Volume 2782, (1996) https://doi.org/10.1117/12.250807

KEYWORDS: Sensors, Interferometry, Optical sensors, Modulation, Fabry–Perot interferometers, Fizeau interferometers, Glasses, Holographic interferometry, Holography, Sensor performance

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Showing 5 of 36 publications

Conference Committee Involvement (2)

Smart Sensor Technology and Measurement Systems

15 March 2004 | San Diego, CA, United States

Smart Sensor Technology and Measurement Systems

3 March 2003 | San Diego, California, United States

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