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Browsing by Author "Kaye, Paul H."
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Modelling light scattering by absorbing smooth and slightly rough facetted particles
Hesse, Evelyn; Collier, C. T.; Penttilä, Antti; Nousiainen, Timo; Ulanowski, Joseph; Kaye, Paul H. (2015-05)A method for approximating light scattering properties of strongly absorbing facetted particles which are large compared to the wavelength is presented. It consists in adding the approximated external diffraction and ... -
Modelling light scattering by rough particles and particulate layers using RTDF
Hesse, Evelyn; Collier, Christopher Thomas; Goldstone, Mica; Ulanowski, Joseph; Kaye, Paul H. (2013-06-20)Computations of light-scattering properties for non-axisymmetric particles based on exact methods like the T-matrix [1] and discrete dipole approximation (DDA) [2] have upper size parameter limits of applicability, depending ... -
A neural network based spatial light scattering instrument for hazardous airborne fiber detection
Hirst, E.; Kaye, Paul H.; Wang, Z. (1997)A laser light scattering instrument has been designed to facilitate the real-time detection of potentially hazardous respirable fibers, such as asbestos, within an ambient environment. The instrument captures data relating ... -
Observations of fluorescent and biological aerosol at a high-altitude site in Central France
Gabey, A.; Vaitilingom, M; Freney, E.; Boulon, J.; Sellegri, K.; Gallagher, M.W.; Crawford, I.P.; Robinson, Niall; Stanley, Warren; Kaye, Paul H. (2013-03-27)Total bacteria, fungal spore and yeast counts were compared with UV Light-Induced Fluorescence (UV-LIF) measurements of ambient aerosol at the summit of the Puy de Dˆome (pdD) mountain in Central France (1465 ma.s.l), which ... -
On solving the inverse scattering problem with RBF neural networks : Noise-free case
Wang, Z; Ulanowski, Z; Kaye, Paul H. (1999)Neural networks are successfully used to determine small particle properties from knowledge of the scattered light - an inverse light scattering problem. This type of problem is inherently difficult to solve as it is ... -
Optimising a hierarchical neural clusterer applied to large gene sequence data sets
Adams, Roderick; Davey, N.; Kaye, Paul H.; Pensuwon, W. (Institute of Electrical and Electronics Engineers (IEEE), 2004)Evolutionary Algorithms have been used to optimise the performance of neural network models before. This paper uses a hybrid approach by permanently attaching a Genetic Algorithm (GA) to a hierarchical clusterer to investigate ... -
Particle Asymmetry Analyser
Particle Instruments and diagnostics; School of Engineering and Technology; Ludlow, Ian; Kaye, Paul H. (1992-09-30) -
Polarized optical scattering signatures from biological materials
Martin, William Eugene; Hesse, E.; Hough, J.H.; Sparks, W.B.; Cockell, C.S.; Ulanowski, Z.; Germer, T.A.; Kaye, Paul H. (2010-11)The polarization of laser light backscattered from biological samples has been measured over the wavelength range 350-850. nm. Incident circular, linearly polarized, and unpolarized light produces significant spectral ... -
Portable Particle Analysers
Particle Instruments and diagnostics; School of Engineering and Technology; Ludlow, Ian; Kaye, Paul H. (1992-07-29) -
Potential for recognition of airborne asbestos fibres from spatial laser scattering profiles
Hirst, E.; Kaye, Paul H.; Hoskins, J.A. (1995)This Short Communication describes some preliminary results of research which seeks to develop a method by which individual airborne asbestos fibres may be detected in real-time within a contaminated environment. The method ... -
The production of precision silicon micromachined non-spherical particles for aerosol studies
Kaye, Paul H.; Micheli, F.; Tracey, M.C.; Hirst, E.; Gundlach, A.M. (1992)A variety of accurately defined non-spherical particles have been produced in silicon dioxide and polycrystalline silicon using the process of silicon micromachining. The particles are of lengths 3μm, 4.5μm, 7.5μm, and ... -
Quantifying bioaerosol concentrations in dust clouds through online UV-LIF and mass spectrometry measurements at the Cape Verde Atmospheric Observatory
Morrison, Douglas; Crawford, Ian; Marsden , Nicholas; Flynn, Michael; Read, Katie; Neves, Luis; Foot, Virginia; Kaye, Paul H.; Stanley, Warren; Coe, Hugh; Topping, David; Gallagher, Martin W (2020-11-28)Observations of the long-range transport of biological particles in the tropics via dust vectors are now seen as fundamental to the understanding of many global atmosphere–ocean biogeochemical cycles, changes in air quality, ... -
Radiosonde aerosol counter for vertical profiling of atmospheric dust
Ulanowski, Joseph; Hirst, Edwin; Kaye, Paul H.; Harrison, R.G.; Nicoll, K.A.; Rogers, George (2010)A low-cost, miniature aerosol particle counter has been developed, intended for use with balloon-borne meteorological radiosondes. It is particularly suitable for airborne mineral dust measurements. Ambient air is drawn ... -
Real-time biological agent detection using particle size, shape and fluorescence characterisation
Shelton, M J; Evans, S P; Smith, P D; Simpson, I A; Kaye, Paul H.; Clarke, J M (SPIE, 2004)Developments in real time optical biological agent detection and sensing are presented which describe start of the art advances in the detection and warning of these pathogens. The following paper describes the basic ... -
Real-time detection of airborne asbestos by light scattering from magnetically re-aligned fibers
Stopford, Chris; Kaye, Paul H.; Greenaway, Richard; Hirst, Edwin; Ulanowski, Zbigniew; Stanley, Warren (2013-05)Inadvertent inhalation of asbestos fibers and the subsequent development of incurable cancers is a leading cause of work-related deaths worldwide. Currently, there is no real-time in situ method for detecting airborne ... -
A real-time monitoring system for airborne particle shape and size analysis
Kaye, Paul H.; Alexander-Buckley, K.; Hirst, E.; Saunders, S.; Clark, J.M. (1996)This paper describes a new instrument for the study of airborne particles. The instrument performs a rapid analysis of the transient spatial intensity distribution of laser-light scattered by individual aerosol particles ... -
Real-time observation of the change in light scattering from droplets with increasing deformity
Secker, D.R.; Kaye, Paul H.; Hirst, E. (2001) -
Respirable asbestos detection using light scattering and magnetic alignment
Ulanowski, Z.; Wang, Z.; Kaye, Paul H.; Ludlow, I.K. (1998)The detection of respirable asbestos fibres in the ambient environment has grown in importance as the health risks associated with this material have become more fully understood. However, there is no real-time method of ... -
Retrieving the size of particles with rough and complex surfaces from two-dimensional scattering patterns
Ulanowski, Zbigniew; Hirst, Edwin; Kaye, Paul H.; Greenaway, Richard (2012-12)Scattered intensity measurement is a commonly used method for determining the size of small particles. However, it requires calibration and is subject to errors due to changes in incident irradiance or detector sensitivity. ... -
Retrieving the size of particles with rough surfaces from 2D scattering patterns
Ulanowski, Zbigniew; Kaye, Paul H.; Hirst, Edwin; Greenaway, Richard (2011)Scattered intensity measurement is a commonly used method for determining the size of small particles. However, it requires calibration and is subject to errors due to changes in incident irradiance or detector sensitivity. ...