Patents by Inventor Edwin Hirst
Edwin Hirst has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10900894Abstract: 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.Type: GrantFiled: April 14, 2016Date of Patent: January 26, 2021Assignee: ALPHASENSE LIMITEDInventors: Paul Henry Kaye, Edwin Hirst
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Publication number: 20160305872Abstract: 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.Type: ApplicationFiled: April 14, 2016Publication date: October 20, 2016Inventors: Paul Henry KAYE, Edwin HIRST
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Patent number: 9116121Abstract: An apparatus for the detection of a fluid-borne particle (10) in an optically defined particle sensing zone, the apparatus comprising: i) a scattering chamber (40); ii) a means for providing a sample of fluid (34), 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 (12) through the optically defined particle sensing zone; iv) a single reflector or refractor (14) means having a primary focus (16) within the optically defined particle sensing zone and a secondary focus (20) located outside the beam of radiation; v) a detector means comprising a first photosensitive detection area (26) a second photosensitive detection area (29); 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 partiType: GrantFiled: October 19, 2011Date of Patent: August 25, 2015Assignee: UH Ventures LimitedInventors: Paul Henry Kaye, Edwin Hirst
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Publication number: 20130229655Abstract: An apparatus for the detection of a fluid-borne particle (10) in an optically defined particle sensing zone, the apparatus comprising: i) a scattering chamber (40); ii) a means for providing a sample of fluid (34), 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 (12) through the optically defined particle sensing zone; iv) a single reflector or refractor (14) means having a primary focus (16) within the optically defined particle sensing zone and a secondary focus (20) located outside the beam of radiation; v) a detector means comprising a first photosensitive detection area (26) a second photosensitive detection area (29); 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 partiType: ApplicationFiled: October 19, 2011Publication date: September 5, 2013Applicant: UNIVERSITY OF HERTFORDSHIRE HIGHER EDUCATION CORPORATIONInventors: Paul Henry Kaye, Edwin Hirst
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Patent number: 7436515Abstract: 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.Type: GrantFiled: December 21, 2005Date of Patent: October 14, 2008Assignee: The Secretary of State of Defense, DSTLInventors: Paul Henry Kaye, Edwin Hirst
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Publication number: 20060250606Abstract: 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 the invention provides an apparatus for the detection of fluid borne particles which comprises: a zone through which a fluid to be analysed 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.Type: ApplicationFiled: December 21, 2005Publication date: November 9, 2006Inventors: Paul Kaye, Edwin Hirst
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Publication number: 20030221980Abstract: The device allows the Compact Disc to spin on its axis. Part of the device comprises of a kite shaped key shaft, which is forced into the well located in the base of the spinner and can be used to grip the spinner. The base disc which has a split level surface that is forced into four parts expanding outwards and gripping the hole of the CD. The lower lip supports the weight of the CD. Located in the base of the spinner is a spike, which allows the CD to spin on its axis and can be spun on the jewel case tray or on any flat surface. The device disassembles to be stored between the back of the tray and the clear Jewel case so that the spike fits comfortably thru the hole and the Key is placed in the corner of the tray.Type: ApplicationFiled: May 31, 2003Publication date: December 4, 2003Inventor: BARRY EDWIN HIRST
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Method and apparatus for the real-time characterization of particles suspended within a fluid medium
Patent number: 6198110Abstract: 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.Type: GrantFiled: September 8, 1998Date of Patent: March 6, 2001Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern IrelandInventors: Paul H Kaye, Edwin Hirst -
Patent number: 5471299Abstract: An apparatus for the analysis of individual particle characteristics from an aerosol or other suspension of particles, of the type having a scattering chamber (15) with an ellipsoidal reflector (17) and an orifice leading to a rear chamber (20), and a monochromatic light source (10) adapted to transmit a collimated beam of light (11) along the main axis of the reflector (17) to impinge on a stream of the particles reflector (17), has an optical system (17, 32, 33, 34) arranged to collect light back-scattered from a particle, through a solid angle of at least 3.pi., pass the light to a a ccd video recorder (36) having a two dimensional array of a multitude of sensors.The recorder (36) is associated with a data processor (37) and with an imaging screen (35) positioned such that rays of light scattered from the particle and imaged thereon by the optical system (17, 32, 33, 34) are monotonically ordered with respect to the angle of scattering of the rays from the particle.Type: GrantFiled: July 29, 1994Date of Patent: November 28, 1995Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern IrelandInventors: Paul H. Kaye, Edwin Hirst