Patents by Inventor Alan H Greenaway
Alan H Greenaway 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: 8517535Abstract: A phase diversity wavefront sensor includes an optical system including at least one optical element for receiving a light beam; a diffractive optical element having a diffractive pattern defining a filter function, the diffractive optical element being arranged to produce, in conjunction with the optical system, images from the light beam associated with at least two diffraction orders; and a detector for detecting the images and outputting image data corresponding to the detected images. In one embodiment, the optical system, diffractive optical element, and detector are arranged to provide telecentric, pupil plane images of the light beam. A processor receives the image data from the detector, and executes a Gerchberg-Saxton phase retrieval algorithm to measure the wavefront of the light beam.Type: GrantFiled: November 18, 2011Date of Patent: August 27, 2013Assignee: AMO Wavefront Sciences, LLC.Inventors: Thomas D Raymond, Paul Pulaski, Stephen W Farrer, Daniel R Neal, Alan H Greenaway, David M Faichnie, Heather I Campbell Dalgarno, Graham N Craik
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Publication number: 20120293769Abstract: A phase diversity wavefront sensor includes an optical system including at least one optical element for receiving a light beam; a diffractive optical element having a diffractive pattern defining a filter function, the diffractive optical element being arranged to produce, in conjunction with the optical system, images from the light beam associated with at least two diffraction orders; and a detector for detecting the images and outputting image data corresponding to the detected images. In one embodiment, the optical system, diffractive optical element, and detector are arranged to provide telecentric, pupil plane images of the light beam. A processor receives the image data from the detector, and executes a Gerchberg-Saxton phase retrieval algorithm to measure the wavefront of the light beam.Type: ApplicationFiled: November 18, 2011Publication date: November 22, 2012Applicant: AMO Wavefront Sciences, LLC.Inventors: Thomas D. Raymond, Paul Pulaski, Stephen W. Farrer, Daniel R. Neal, Alan H. Greenaway, David M. Faichnie, Heather I. Campbell Dalgarno, Graham N. Craik
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Patent number: 8118429Abstract: A phase diversity wavefront sensor includes an optical system including at least one optical element for receiving a light beam; a diffractive optical element having a diffractive pattern defining a filter function, the diffractive optical element being arranged to produce, in conjunction with the optical system, images from the light beam associated with at least two diffraction orders; and a detector for detecting the images and outputting image data corresponding to the detected images. In one embodiment, the optical system, diffractive optical element, and detector are arranged to provide telecentric, pupil plane images of the light beam. A processor receives the image data from the detector, and executes a Gerchberg-Saxton phase retrieval algorithm to measure the wavefront of the light beam.Type: GrantFiled: October 28, 2008Date of Patent: February 21, 2012Assignee: AMO Wavefront Sciences, LLC.Inventors: Thomas D. Raymond, Paul Pulaski, Stephen W. Farrer, Daniel R. Neal, Alan H. Greenaway, David M. Faichnie, Heather I. Campbell Dalgarno, Graham N. Craik
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Publication number: 20090185132Abstract: A phase diversity wavefront sensor includes an optical system including at least one optical element for receiving a light beam; a diffractive optical element having a diffractive pattern defining a filter function, the diffractive optical element being arranged to produce, in conjunction with the optical system, images from the light beam associated with at least two diffraction orders; and a detector for detecting the images and outputting image data corresponding to the detected images. In one embodiment, the optical system, diffractive optical element, and detector are arranged to provide telecentric, pupil plane images of the light beam. A processor receives the image data from the detector, and executes a Gerchberg-Saxton phase retrieval algorithm to measure the wavefront of the light beam.Type: ApplicationFiled: October 28, 2008Publication date: July 23, 2009Applicant: AMO WAVEFRONT SCIENCES, LLC.Inventors: Thomas D. RAYMOND, Paul PULASKI, Stephen W. FARRER, Daniel R. NEAL, Alan H. GREENAWAY, David M. FAICHNIE, Heather I. CAMPBELL DALGARNO, Graham N. CRAIK
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Patent number: 6975457Abstract: A three-dimensional imaging system is described which exploits the defocusing of non-zero diffraction order images caused by the quadratic distortion of a diffraction grating (4). An optical system (1) is used such that objects (5, 6 and 7), located at different distances from grating (4), are imaged simultaneously and spatially separated on a single plane B.Type: GrantFiled: March 5, 1999Date of Patent: December 13, 2005Assignee: QinetiQ LimitedInventors: Alan H Greenaway, Paul M Blanchard
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Patent number: 6621956Abstract: An optical fibre bend sensor (10) measures the degree and orientation of bending present in a sensor length (30) portion of a fibre assembly (26). Within a multicored fibre (30, 32,34), cores (62, 66) are grouped in non-coplanar pairs. An arrangement of optical elements (28, 36, 38) define within each core pair (62, 66) two optical paths (122, 124) which differ along the sensor length (30): one core (62) of a pair (62, 66) is included in the first path (122), and the other core (66) in the second path (124). A general bending of the sensor region (30) will lengthen one core (62, 66) with respect to the other. Interrogation of this length differential by means of interferometry generates interferograms from which the degree of bending in the plane of the core pair is extracted. Bend orientation can be deduced from data extracted from multiple core pairs.Type: GrantFiled: January 24, 2002Date of Patent: September 16, 2003Assignee: Qinetiq LimitedInventors: Alan H Greenaway, James G Burnett, Andrew R Harvey, Paul M Blanchard, Peter A Lloyd, Roy McBride, Philip St John Russell
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Patent number: 6547406Abstract: An infra-red imaging system has two variable focal length optical components (6, 7) whose positions are fixed relative to one another. The system also comprises an image detector (8). Control means (13) is provided such that the focal length of one of the variable focal length optical components (7) can be varied in relation to the focal length of the other variable focal length optical component (6). The system can be used to produce an image of variable magnification while maintaining an in-focus image at the detector (8). The control means (13) may comprise a mechanical linkage, an electronic circuit, or a computer program. In an alternative embodiment the optical system is a beam expander. Controlling a focusing mirror can achieve a dither effect. Controlling a focusing mirror can also de-focus the image, giving a mean scene temperature evaluation.Type: GrantFiled: May 2, 2000Date of Patent: April 15, 2003Assignee: Qinetiq LimitedInventors: Alan H. Greenaway, Paul Harrison, Robin Dickson
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Publication number: 20020097960Abstract: An optical fiber bend sensor (10) measures the degree and orientation of bending present in a sensor length (30) portion of a fiber assembly (26). Within a multicored fiber (30, 32,34), cores (62, 66) are grouped in non-coplanar pairs. An arrangement of optical elements (28, 36, 38) define within each core pair (62, 66) two optical paths (122, 124) which differ along the sensor length (30): one core (62) of a pair (62, 66) is included in the first path (122), and the other core (66) in the second path (124). A general bending of the sensor region (30) will lengthen one core (62, 66) with respect to the other. Interrogation of this length differential by means of interferometry generates interferograms from which the degree of bending in the plane of the core pair is extracted. Bend orientation can be deduced from data extracted from multiple core pairs.Type: ApplicationFiled: January 24, 2002Publication date: July 25, 2002Applicant: The Secretary of State for DefenceInventors: Alan H. Greenaway, James G. Burnett, Andrew R. Harvey, Paul M. Blanchard, Peter A. Lloyd, Roy McBride, Philip St John Russell
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Patent number: 6389187Abstract: An optical fiber bend sensor (10) measures the degree and orientation of bending present in a sensor length (30) portion of a fiber assembly (26). Within a multicored fiber (30, 32, 34), cores (62, 66) are grouped in non-coplanar pairs. An arrangement of optical elements (28, 36, 38) define within each core pair (62, 66) two optical paths (122, 124) which differ along the sensor length (30): one core (62) of a pair (62, 66) is included in the first path (122), and the other core (66) in the second path (124). A general bending of the sensor region (30) will lengthen one core (62, 66) with respect to the other. Interrogation of this length differential by means of interferometry generates interferograms from which the degree of bending in the plane of the core pair is extracted. Bend orientation can be deduced from data extracted from multiple core pairs.Type: GrantFiled: April 21, 2000Date of Patent: May 14, 2002Assignee: Qinetiq LimitedInventors: Alan H Greenaway, James G Burnett, Andrew R Harvey, Peter A Lloyd, Roy McBride, Philip St John Russell, Paul M Blanchard
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Patent number: 6301420Abstract: An optical fiber for transmitting radiation comprising two or more core regions, two or more core regions, each core region comprising a substantially transparent core material and having a core refractive index, a core length, and a core diameter, wherein said core regions are arranged within a cladding region, said cladding region comprising a length of first substantially transparent cladding material, having a first refractive index, wherein said first substantially transparent cladding material has an array of lengths of a second cladding material embedded along its length, wherein the second cladding material has a second refractive index which is less than said first refractive index, such that radiation input to said fiber propagates along at least one of said core regions. The cladding region and the core regions may be arranged such that radiation input to said optical fiber propagates along one or more said lengths of said core regions in a single mode of propagation.Type: GrantFiled: May 1, 1998Date of Patent: October 9, 2001Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern IrelandInventors: Alan H. Greenaway, Peter A. Lloyd, Timothy A. Birks, Philip S. Russell, Jonathan C. Knight
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Patent number: 6137573Abstract: A sensor system (10) incorporating an interferometer operates as an optical strain gauge. The system (10) is arranged to generate interferograms characterised by an optical path difference between light traversing a sensor arm (12) of the interferometer and light traversing a reference arm (58). Each arm incorporates a highly birefringent optical fibre (38, 58) capable of supporting light propagation at two velocities in two different polarisation modes. A first interferogram is generated between light coupled into the fast eigenmodes of each fibre and a second is generated between light coupled into the slow eigenmodes. Mean optical group delay (.tau..sub.MGD) and differential optical group delay (.tau..sub.DGD) of these interferograms are affected differently by temperature and strain and thus provide a means of discriminating between these attributes of the sensor environment. Thus simultaneous measurement of strain and temperature is achieved.Type: GrantFiled: September 16, 1998Date of Patent: October 24, 2000Assignee: The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern IrelandInventors: David G Luke, Roy McBride, Peter A Lloyd, James G Burnett, Alan H Greenaway, Julian D C Jones