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Browsing by Author "Particle Instruments and diagnostics"
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A 3D implementation of ray tracing combined with diffraction on facets: Verification and a potential application
Clarke, A.J.M.; Hesse, E.; Ulanowski, Z.; Kaye, Paul H. (2006)A 3D implementation of a new model of light scattering applicable to dielectric faceted objects is introduced. The model combines standard geometric optics with diffraction on individual facets. It can be applied to any ... -
The Ability of the Small Ice Detector (SID-2) to Characterize Cloud Particle and Aerosol Morphologies Obtained during Flights of the FAAM BAe-146 Research Aircraft
Cotton, R.; Osborne, S.; Ulanowski, Z.; Hirst, E.; Kaye, Paul H.; Greenaway, R. (2010)The Small Ice Detector mark 2 (SID-2), which was built by the University of Hertfordshire, has been operated by the Met Office on the Facility for Atmospheric Airborne Research (FAAM) BAe-146 aircraft during a large number ... -
AIITS: Preliminary light scattering data from Tropical Tropopause Layer cirrus
Stopford, Chris; Kaye, Paul H.; Ulanowski, Joseph; Hirst, Edwin; Greenaway, Richard; Dorsey, James; Gallagher, Martin; Woods, Sarah; Lawson, Paul; Thornberry, Troy; Rollins, Drew; Harris, Neil (2015-07-22)The new optical particle spectrometer AIITS (Aerosol Ice Interface Transition Spectrometer) is the next instrument in the Small Ice Detector (SID) family. Like SID3, it acquires two-dimensional forward scattering patterns ... -
Airborne particle shape and size classification from spatial light scattering profiles
Kaye, Paul H.; Hirst, E.; Clark, J.M.; Micheli, F. (1992)A new instrument for the study of airborne particles is described. The instrument incorporates a laminar flow sample delivery system which constrains airborne particles to traverse a focussed laser beam in single file. ... -
Alignment of atmospheric mineral dust due to electric field
Ulanowski, Z.; Bailey, J. A.; Lucas, P.W.; Hough, J.; Hirst, E. (2007)Optical polarimetry observations on La Palma, Canary Islands, during a Saharan dust episode show dichroic extinction indicating the presence of vertically aligned particles in the atmosphere. Modelling of the extinction ... -
Angularly resolved elastic scattering from airborne particles - Potential for characterizing, classifying, and identifying individual aerosol particles
Kaye, Paul H.; Aptowicz, Kevin; Chang, Richard K.; Foot, Virginia; Videen, Gorden (Springer Nature, 2007)Analysing the light scattering properties of individual airborne particles has become a powerful tool by which they may be characterized, classified, and in some cases, identified. The approach offers a non-invasive, ... -
Apparatus and Method for the Analysis of Particle Characteristics using Monotonically Scattered light.
Particle Instruments and diagnostics; Kaye, Paul; Hirst, Edwin (1995-11-28) -
Application of neural networks to the inverse light scattering problem for spheres
Ulanowski, Zbigniew; Wang, Z.; Kaye, Paul H.; Ludlow, Ian (1998)A new approach suitable for solving inverse problems in multi-angle light scattering is presented. The method takes advantage of multidimensional function approximation capability of radial basis function (RBF) neural ... -
Application of RTDF to particles with curved surfaces
Hesse, E.; McCall, D.; Ulanowski, Z.; Stopford, C.; Kaye, Paul H. (2009)The applicability of the ray tracing with diffraction on facets model is extended to particles with curved surfaces. This allows tests against T-matrix calculations for larger size parameters and modelling of light scattering ... -
Application of RTDF to particles with curved surfaces
Hesse, E.; McCall, D.; Ulanowski, Z.; Stopford, C.; Kaye, Paul H. (University of Hertfordshire, 2008)The applicability of RTDF is extended to particles with curved surfaces. This allows tests against T-matrix calculations for larger size parameter and modeling of light scattering by more realistic particle shapes, such ... -
Applying machine learning methods for characterization of hexagonal prisms from their 2D scattering patterns – an investigation using modelled scattering data
Salawu, Emmanuel Oluwatobi; Hesse, Evelyn; Stopford, Chris; Davey, Neil; Sun, Yi (2017-11-01)Better understanding and characterization of cloud particles, whose properties and distributions affect climate and weather, are essential for the understanding of present climate and climate change. Since imaging cloud ... -
Atmospheric dust charging, vertical profiles, and optical properties measured in the Arabian Peninsula during the DREAME campaign
Ulanowski, Joseph; Sabbah, Ismail; Harrison, R.G.; Nicoll, K.A.; Hirst, Edwin; Kaye, Paul H.; Al-Abbadi, Naif; Rogers, George (2010)Polarimetric observations of atmospheric Saharan dust over the Canary Islands have provided strong evidence for the presence of vertically aligned particles. The alignment was thought to be due to the electric field present ... -
Bio-aerosol fluorescence - Detecting and characterising bio-aerosols via UV light-induced fluorescence spectroscopy
Pan, Yong-Le; Eversole, Jay D.; Kaye, Paul H.; Foot, Virginia; Pinnick, Ronald G.; Hill, Steven C.; Mayo, Michael W.; Bottiger, Jerold R.; Huston, Alan; Sivaprakasarn, Vasanthi; Chang, Richard K. (Springer Nature, 2007)All aspects of fluorescence from a single or a cluster of bio-aerosol particles are treated in this chapter. The following topics are covered: light sources to induce fluorescence, detectors to sense fluorescence, excitation ... -
Characterisation and source identification of biofluorescent aerosol emissions over winter and summer periods in the United Kingdom
Forde, Elizabeth; Gallagher, Martin W.; Foot, Virginia; Sada-Esteve, Roland; Crawford, I.A.; Kaye, Paul; Stanley, Warren; Topping, David (2019-02-08)Primary biological aerosol particles (PBAPs) are an abundant subset of atmospheric aerosol particles which comprise viruses, bacteria, fungal spores, pollen, and fragments such as plant and animal debris. The abundance and ... -
The characterisation of airborne particles by analysis of spatial light scattering profiles
Kaye, Paul H.; Hirst, Edwin; Micheli, F. (1992)An instrument has been developed to investigate the potential characterisation of airborne particles, with particular reference to shape and size, by analysis of the spatial intensity distribution of scattered light. In ... -
Characterisation of atmospheric cloud particles using a light scattering probe
Hirst, E.; Kaye, Paul H.; Greenaway, R.; Field, P.R. (2000)When investigating the composition and dynamics of the atmosphere's particulate matter, particle shape is an important parameter by which classification and possibly identification of particles may be achieved. Spherical ... -
Characterisation of bioaerosol emissions from a Colorado pine forest : results from the BEACHON-RoMBAS experiment
Crawford, I.P.; Robinson, Niall; Flynn, M.; Foot, V.E.; Gallagher, M.W.; Huffman, J. A.; Stanley, Warren; Kaye, Paul H. (2014-01-21)The behaviour of Primary Biological Aerosols (PBA) at an elevated, un-polluted North American forest site was studied using an Ultra Violet-Light Induced Fluorescence (UV-LIF) measurement technique in conjunction with ... -
Characterising atmospheric cloud particles using spatial light scattering
Hirst, Edwin; Kaye, Paul H.; Saunders, S.; Johnson, D.W.; Pickering, M.A. (1998)To be able to understand the radiative transfer properties of ice and mixed phase (ice and water) clouds, a detailed knowledge of the cloud particles' shapes and sizes is required, along with measurements of the number ... -
Characterising droplet behaviour in an aerodynamic particle sizer by means of spatial light scattering
Secker, D.R.; Hirst, Edwin; Kaye, Paul H. (1998)This paper describes the progress of a research project aimed at optically characterising the degree of deformation suffered by liquid droplets within the TSI Aerodynamic Particle Sizer APS3320 with a view to providing a ... -
Characterization of small ice crystals using frequency analysis of azimuthal scattering patterns
Ulanowski, Zbigniew; Stopford, Chris; Hesse, Evelyn; Kaye, Paul H.; Hirst, Edwin; Schnaiter, M. (2007)Azimuthal scattering patterns obtained from ice crystals using the Small Ice Detector 2 are examined. They are converted to frequency spectra using Fast Fourier Transform. To classify the shape of the crystals, the spectra ...