Dr. Fereyduon Lakestani Profile

Dr. Fereyduon Lakestani

at Joint Research Ctr

SPIE Involvement:

Author

Publications (10)

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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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 | 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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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

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

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 | 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 | 12 April 2004 Paper

Method for measuring thermal diffusivity on bulk samples

Fereydoun Lakestani, Antonio Salerno, Alberto Volcan

Proceedings Volume 5405, (2004) https://doi.org/10.1117/12.547682

KEYWORDS: Phase shifts, Modulation, Infrared detectors, Diffusion, Photodiodes, Temperature metrology, Thermography, Infrared radiation, Radiometry, Signal detection

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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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Showing 5 of 10 publications

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