Dr. Michael K. Andrews Profile

KEYWORDS: Speckle, Doppler effect, Imaging systems, Tissues, Cameras, Tissue optics, Sensors, Laser systems engineering, Scattering, Laser tissue interaction

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SPIE Journal Paper | 1 March 2010 Open Access

Tissue perfusion measurements: multiple-exposure laser speckle analysis generates laser Doppler-like spectra

Oliver Thompson, Michael Andrews

JBO, Vol. 15, Issue 02, 027015, (March 2010) https://doi.org/10.1117/12.10.1117/1.3400721

KEYWORDS: Speckle, Doppler effect, Skin, Laser tissue interaction, Speckle pattern, Speckle analysis, Laser scattering, Computer simulations, Blood, Blood circulation

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Proceedings Article | 23 February 2010 Paper

Measuring Doppler-like power spectra and dermal perfusion using laser speckle contrast with multiple exposures

O. Thompson, M. Andrews

Proceedings Volume 7563, 75630N (2010) https://doi.org/10.1117/12.841501

KEYWORDS: Speckle, Doppler effect, Cameras, Skin, Laser systems engineering, Motion measurement, Blood circulation, Blood, Speckle pattern, Laser tissue interaction

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Proceedings Article | 12 February 2009 Paper

Spatial and temporal effects in speckle perfusion measurement

O. Thompson, M. Andrews

Proceedings Volume 7176, 717604 (2009) https://doi.org/10.1117/12.807901

KEYWORDS: Speckle, Skin, Tissues, Scattering, Doppler effect, Capillaries, Laser scattering, Silicon, Signal attenuation, Blood circulation

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Proceedings Article | 18 February 2008 Paper

Spectral density and tissue perfusion from speckle contrast measurements

O. Thompson, M. Andrews

Proceedings Volume 6847, 68472D (2008) https://doi.org/10.1117/12.761453

KEYWORDS: Speckle, Doppler effect, Tissues, Cameras, Laser applications, Blood circulation, Doppler tomography, Imaging systems, Statistical analysis, Skin

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Proceedings Article | 9 February 2005 Paper

Silver nanoparticles by laser ablation

Yong Yuan, Mike Andrews, Barry Marlow, Alexander Pyatenko, Masaaki Suzuki

Proceedings Volume 5635, (2005) https://doi.org/10.1117/12.568616

KEYWORDS: Silver, Nanoparticles, Crystals, Laser ablation, Transmission electron microscopy, Photomicroscopy, Diffraction, Particles, Nanolithography, Nanostructures

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Proceedings Article | 28 July 2003 Paper

Gas concentration control by directly linking sensor to actuator

Mike Andrews, Murray Jansen, Jason Morris, Geoffrey Spinks, Dezhi Zhou, Gordon Wallace

Proceedings Volume 5051, (2003) https://doi.org/10.1117/12.484824

KEYWORDS: Oxygen, Actuators, Sensors, Control systems, Polymers, Polymeric actuators, Atmospheric sensing, Diffusion, Polymeric sensors, Nitrogen

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Proceedings Article | 29 April 2003 Paper

Electric-field-mediated fabrication of nano/microstructures

Yong Yuan, Mike Andrews, W. Arnold, Barry Marlow

Proceedings Volume 5118, (2003) https://doi.org/10.1117/12.498704

KEYWORDS: Nanolithography, Particles, Electrodes, Gold, Dielectrophoresis, Nanoparticles, Dendrites, Aluminum, Liquids, Electronic circuits

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Notable recent developments toward the realization of electronic nanocomputers have assembled logic circuits from semiconductor nanowires and individual carbon nanotube molecules. In spite of the broadly based and encouraging recent progress, a set of technical challenges still must be overcome to make a robust, commercially viable computer integrated on the molecular scale. The assembly of colloidal particles under an electric field offers many opportunities for the fabrication of ordered arrays, nanostructured films and microwires. We describe a method for the fabrication of gold nano/microstructures such as wires and dendrites on a lithographically patterned aluminium electrode with electric-field-induced assembly. The simple fabrication process will make these structures suitable for the miniaturisation of electronic circuits that can find application in sensors, actuators, and lab-on-a-chip devices. Our approach to electric-field-mediated fabrication exposes colloidal gold particles to the high electric field that can be generated between electrodes only 200 mm apart. We introduce an electric field of 100 Hz to 10 MHz by application of an alternating voltage of 5 to 10 V to the lithographically patterned microelectrodes. A suspension of gold nanoparticles of diameter 2.5 nm is added. We observe three types of fabrication, represented by three zones due to the different dielectophoretic force and convection effects. Some fibres grow through the liquid from one electrode toward the other, as could be seen in-situ by inverse optical microscopy. Dielectrophoretic-force-mediated fabrication, which is very flexible depending on the magnitudes of electric-field strength and frequency applied, has produced a notable advance in making mechanically flexible nano/microelectronic devices and led to a new understanding of the factors controlling the growth of nano/microstructures. When drops of suspension are patterned on the faces of components, three-dimensional structures can be generated. This type of system indicates how functional, self-assembling nano/microelectronic systems may be made. It provides a faster way of making devices, and the process can be very economical.

Proceedings Article | 14 November 1997 Paper

Development of an electronic nose

Joseph Barisci, Mike Andrews, Paul Harris, Ashton Partridge, Gordon Wallace

Proceedings Volume 3242, (1997) https://doi.org/10.1117/12.293544

KEYWORDS: Sensors, Polymers, Resistance, Electrodes, Polymer thin films, Nose, Polymeric sensors, Gold, Principal component analysis, Chemical elements

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