The Secretary of State for Defence in Her Britannic Majesty's Government

University of Hertfordshire

The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland

Alphasense Limited

Trolex Limited

Uh Ventures Limited

The Secretary of State of Defense, Dstl

Paul H Kaye

Edwin Hirst

Ian K Ludlow

William Eugene Martin

Edward Hirst

Mark Tracey

An optical particle counter determines the velocity of particles passing through a particle detection zone, and thereby the velocity of gas flow, from both the measured time of flight of discrete particles and also the size of intensity peaks of scattered light. This is used to determine particle concentration and may be used to control an optional fan.

Optical particle counter

A method for determining the presence of crystalline silica particles in a sample comprising a plurality of particles. The method comprises: receiving first data generated based upon light scattered by at least one particle of said plurality of particles; receiving second data generated based upon intensity and polarization change of the light transmitted through at least one particle of said plurality of particles; and determining the presence of crystalline silica particles in the sample based upon the first data and second data.

Crystalline particle detection

An apparatus for the detection of a fluid-borne particle () in an optically defined particle sensing zone, the apparatus comprising: i) a scattering chamber (); ii) a means for providing a sample of fluid (), containing the fluid-borne particle, in the form of a flow through the optically defined particle sensing zone; iii) A means for generating a beam of radiation () through the optically defined particle sensing zone; iv) a single reflector or refractor () means having a primary focus () within the optically defined particle sensing zone and a secondary focus () located outside the beam of radiation; v) a detector means comprising a first photosensitive detection area () a second photosensitive detection area (); vi) a means for deriving area from the radiation detected by the first photosensitive detection area and second photosensitive detection area of the detection means wherein the single reflector or refractor means is adapted to direct radiation scattered from the fluid borne particle passing through the beam of radiation within the optically defined particle sensing zone to the detection means located at the secondary focus of the single reflector or refractor means and the optically sensing zone comprises a first and a second zone.

Second generation low-cost particle counter

This invention describes an improved method and apparatus for the analysis of fluid borne particles and which is especially suitable for the detection of airborne biological particles. In one aspect of the invention provides an apparatus for the detection of fluid borne particles which comprises a zone through which a fluid to be analyzed flows in use, a source of illumination to illuminate/irradiate fluid borne particles present in said zone, and a detector to detect light from the particles as an indicator of the presence or characteristics of the particles, wherein the apparatus comprises an integrating sphere and the zone is within the integrating sphere. The apparatus is highly sensitive and can be used for detecting airborne particles even where the particles are present at very low particle concentrations in the air.

Fluid borne particle analyzers

Detection of hazardous airborne fibres

This invention describes a method by which microparticles, typically in the size range from 0.3 &mgr;m to 100 &mgr;m, which are carried in a fluid suspension, may be rapidly detected and characterized. The method primarily relates to the measurement of atmospheric particles such as those in clouds or environmental aerosols, but it may be used to measure other forms of particulate suspension wherever the flow of suspension through a defined measurement space can be achieved. The method is based upon a rapid analysis of the spatial laser scattering profile (i.e., the complex manner in which individual particles scatter laser light) recorded from individual particles as they are carried in suspension through a measurement space. Using this method it is possible to differentiate various types of particles based on particle shape and structure, as manifest in characteristics of their individual spatial light scattering patterns. The sizes of spherical particles and the spherical equivalent sizes of non-spherical particles may also be determined, allowing size distribution for each particle type within the suspension to be determined. An implementation of the method for use in an aircraft mounted instrument is described.

Method and apparatus for the real-time characterization of particles suspended within a fluid medium

Apparatus and method for the analysis of particle characteristics using

Biorheological measurement

Particle asymmetry analyzer having sphericity detectors

Portable particle analysers having plural detectors

Growing community of inventors

Kimpton, United Kingdom

Paul H Kaye