Patents by Inventor Yanhua Shih
Yanhua Shih 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: 11209660Abstract: A system for projecting an image of an object on an image plane can include a beam splitter that outputs a first image beam and a second image beam in response to an input image beam, wherein the input image beam comprises an image of an object. The system can also include a Fourier transform lens to transform the second image beam into a Fourier image beam. The system can further include a bucket detector that is aligned in a light path of the Fourier image beam. The bucket detector asserts a control signal in response to detecting a threshold number of photons with an elevated probability of having a high spatial frequency within a timeframe and to de-assert the control signal in response to detecting less than the threshold number of photons with an elevated probability of having a high spatial frequency within the timeframe.Type: GrantFiled: January 20, 2020Date of Patent: December 28, 2021Assignee: NORTHROP GRUMMAN SYSTEMS CORPORATIONInventors: Michael Manuel Fitelson, Yanhua Shih, Jane Noble Sprigg
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Publication number: 20210223560Abstract: A system for projecting an image of an object on an image plane can include a beam splitter that outputs a first image beam and a second image beam in response to an input image beam, wherein the input image beam comprises an image of an object. The system can also include a Fourier transform lens to transform the second image beam into a Fourier image beam. The system can further include a bucket detector that is aligned in a light path of the Fourier image beam. The bucket detector asserts a control signal in response to detecting a threshold number of photons with an elevated probability of having a high spatial frequency within a timeframe and to de-assert the control signal in response to detecting less than the threshold number of photons with an elevated probability of having a high spatial frequency within the timeframe.Type: ApplicationFiled: January 20, 2020Publication date: July 22, 2021Applicant: NORTHROP GRUMMAN SYSTEMS CORPORATIONInventors: MICHAEL MANUEL FITELSON, YANHUA SHIH, JANE NOBLE SPRIGG
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Patent number: 10348985Abstract: A turbulence-free CCD camera system with nonclassical imaging resolution, for applications in long-distance imaging, such as satellite and aircraft-to-ground based distant imaging, utilizing an intensity-fluctuation correlation measurement of thermal light. The proposed camera system has the following advantages over classic imaging technology: (1) it is turbulence-free; (2) its spatial resolution is mainly determined by the angular diameter of the light source. For example, using sun as the light source, this camera may achieve a spatial resolution of 200 micrometer for any object on Earth. 200-micrometer resolution is insignificant for short distance imaging, however, taking a picture of a target at 10-kilometer, a classic camera must have a lens of 90-meter diameter in order to achieve 200-micrometer resolution.Type: GrantFiled: September 20, 2016Date of Patent: July 9, 2019Assignee: UNIVERSITY OF MARYLAND BALTIMORE COUNTYInventors: Yanhua Shih, Hui Chen, Tao Peng
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Patent number: 10298813Abstract: A camera and imaging method with nonclassical imaging resolution, for applications in long-distance imaging, such as satellite and aircraft-to-ground based distant imaging, utilizing an intensity-fluctuation correlation measurement of thermal light.Type: GrantFiled: March 3, 2017Date of Patent: May 21, 2019Assignee: University of Maryland Baltimore CountyInventors: Jane Sprigg, Ian Tolfree, Yanhua Shih
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Publication number: 20180255212Abstract: A camera and imaging method with nonclassical imaging resolution, for applications in long-distance imaging, such as satellite and aircraft-to-ground based distant imaging, utilizing an intensity-fluctuation correlation measurement of thermal light.Type: ApplicationFiled: March 3, 2017Publication date: September 6, 2018Inventors: Jane Sprigg, Ian Tolfree, Yanhua Shih
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Publication number: 20170013213Abstract: A turbulence-free CCD camera system with nonclassical imaging resolution, for applications in long-distance imaging, such as satellite and aircraft-to-ground based distant imaging, utilizing an intensity-fluctuation correlation measurement of thermal light. The proposed camera system has the following advantages over classic imaging technology: (1) it is turbulence-free; (2) its spatial resolution is mainly determined by the angular diameter of the light source. For example, using sun as the light source, this camera may achieve a spatial resolution of 200 micrometer for any object on Earth. 200-micrometer resolution is insignificant for short distance imaging, however, taking a picture of a target at 10-kilometer, a classic camera must have a lens of 90-meter diameter in order to achieve 200-micrometer resolution.Type: ApplicationFiled: September 20, 2016Publication date: January 12, 2017Inventors: Yanhua SHIH, Hui Chen, Tao Peng
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Patent number: 9444978Abstract: A turbulence-free CCD camera system with nonclassical imaging resolution, for applications in long- distance imaging, such as satellite and aircraft-to-ground based distant imaging, utilizing an intensity- fluctuation correlation measurement of thermal light. The proposed camera system has the following advantages over classic imaging technology: (1) it is turbulence-free; (2) its spatial resolution is mainly determined by the angular diameter of the light source. For example, using sun as the light source, this camera may achieve a spatial resolution of 200 micrometer for any object on Earth. 200-micrometer resolution is insignificant for short distance imaging, however, taking a picture of a target at 10-kilometer, a classic camera must have a lens of 90-meter diameter in order to achieve 200-micrometer resolution.Type: GrantFiled: June 17, 2014Date of Patent: September 13, 2016Assignee: The University of Maryland, Baltimore CountyInventors: Yanhua Shih, Hui Chen, Tao Peng
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Publication number: 20140368715Abstract: A turbulence-free CCD camera system with nonclassical imaging resolution, for applications in long- distance imaging, such as satellite and aircraft-to-ground based distant imaging, utilizing an intensity- fluctuation correlation measurement of thermal light. The proposed camera system has the following advantages over classic imaging technology: (1) it is turbulence-free; (2) its spatial resolution is mainly determined by the angular diameter of the light source. For example, using sun as the light source, this camera may achieve a spatial resolution of 200 micrometer for any object on Earth. 200-micrometer resolution is insignificant for short distance imaging, however, taking a picture of a target at 10-kilometer, a classic camera must have a lens of 90-meter diameter in order to achieve 200-micrometer resolution.Type: ApplicationFiled: June 17, 2014Publication date: December 18, 2014Inventors: Yanhua Shih, Hui Chen, Tao Peng
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Patent number: 7684015Abstract: A system and method for clock synchronization and position determination using entangled photon pairs is provided. The present invention relies on the measurement of the second order correlation function of entangled states. Photons from an entangled photon source travel one-way to the clocks to be synchronized. By analyzing photon registration time histories generated at each clock location, the entangled states allow for high accuracy clock synchronization as well as high accuracy position determination.Type: GrantFiled: March 15, 2005Date of Patent: March 23, 2010Assignee: University of Maryland, Baltimore CountyInventor: Yanhua Shih
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Publication number: 20050199812Abstract: A system and method for clock synchronization and position determination using entangled photon pairs is provided. The present invention relies on the measurement of the second order correlation function of entangled states. Photons from an entangled photon source travel one-way to the clocks to be synchronized. By analyzing photon registration time histories generated at each clock location, the entangled states allow for high accuracy clock synchronization as well as high accuracy position determination.Type: ApplicationFiled: March 15, 2005Publication date: September 15, 2005Applicant: University of MarylandInventor: Yanhua Shih
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Publication number: 20020182257Abstract: A microscopic image product comprising a light source that produces light that is made of entangled photons. Light made of entangled photons is used in lithography and other applications producing improved resolution for microscopic images.Type: ApplicationFiled: May 17, 2002Publication date: December 5, 2002Applicant: UNIVERSITY OF MARYLANDInventors: Yanhua Shih, Milena D'Angelo, Maria Chekhova
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Patent number: 5635706Abstract: A direct conversion broad band x-ray/gamma-ray photocathode having at least one layer functioning as an efficient x-ray or gamma-ray absorber and another layer functioning as an efficient transmission secondary electron emitter for providing both high detection efficiency and high spatial resolution, for use in either a radiation detection environment or an image intensification environment.Type: GrantFiled: March 27, 1996Date of Patent: June 3, 1997Assignee: CSL Opto-Electronics CorporationInventors: Yongzheng She, Fonglan Ji, Wei-Lou Cao, Meizhen Zhang, Yanhua Shih, Roger H. Schneider
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Patent number: 5351279Abstract: A direct conversion X-ray photo-electron cathode has specially designed secondary electron emission layers which provides high efficiency, low noise, high speed and broad band X-ray photon detection. The X-ray photocathode is integrated with a micro channel plate and an output phosphor display screen to form a panel type X-ray intensifier. The X-ray intensifier is combined with a micro-focus X-ray source to provide projection type X-ray microscope for use in X-ray microscopic diagnostic applications.Type: GrantFiled: October 25, 1993Date of Patent: September 27, 1994Assignee: CSL Opto-Electronics CorporationInventors: Yongzheng She, Shizheng Chen, Weilou Cao, Yanhua Shih
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Patent number: 5285061Abstract: A direct conversion X-ray photo-electron cathode has specially designed secondary electron emission layers which provides high efficiency, low noise, high speed and broad band X-ray photon detection. The X-ray photocathode is integrated with a micro channel plate and an output phosphor display screen to form a panel type X-ray intensifier. The X-ray intensifier is combined with a micro-focus X-ray source to provide projection type X-ray microscope for use in X-ray microscopic diagnostic applications.Type: GrantFiled: August 28, 1992Date of Patent: February 8, 1994Assignee: CSL Opto-Electronics Corp.Inventors: Yongzheng She, Shizheng Chen, Weilou Cao, Yanhua Shih
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Patent number: 5225670Abstract: High quantum efficiency (.gtoreq.5%) ultrafast (.ltoreq.100 picosecond) and broad band (30 KeV to 80 KeV for medical application) X-ray photo-electron cathode, high gain X-ray real time image intensifier and portable low intensity real time projection type X-ray imagescope use new vacuum photo-electron devices. A new type X-ray photo-electron cathode has a specially designed alkali halide electron emission layer that makes possible high quantum efficiency, high speed and broad band X-ray photon detection. An X-ray photo-electron cathode followed by a direct coupled micro channel plate and an output phosphor display screen form a new type panel shaped direct view X-ray intensifier tube which can have both high spatial resolution (.gtoreq.10 lp/mm) and high gain (.gtoreq.10.sup.4). The thickness of this panel shaped disc X-ray intensifier can be less than 1 cm.Type: GrantFiled: March 6, 1991Date of Patent: July 6, 1993Assignee: CSL Opto-Electronics Corp.Inventors: Yangzheng She, Weilou Cao, Xiaowen Yang, Shizheng Zhen, Xinan Lu, Hanping Wang, Ming-guang Li, Yanhua Shih