Patents by Inventor Tiezhu Li
Tiezhu Li 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: 8913707Abstract: A photoneutron conversion target for generating photoneutrons by directing an x-ray beam at the photoneutron conversion target includes an elongated body having a first end and a second end. When the photoneutron conversion target is in use, the x-ray beam enters the body and propagates in a direction from the first end to the second end. The body of the photoneutron conversion target is shaped such that propagation of the x-ray beam is substantially proportionate to an intensity distribution of the x-ray beam, so that the greater an intensity of x-rays of the x-ray beam, the greater the propagation distance of the x-rays within the body of the photoneutron conversion target. The photoneutron conversion target according to the invention can make full use of the x-ray beam so as to increase a yield of photoneutrons.Type: GrantFiled: June 19, 2008Date of Patent: December 16, 2014Assignees: Tsinghua University, Nuctech Company LimitedInventors: Kejun Kang, Haifeng Hu, Yigang Yang, Zhiqiang Chen, Qitian Miao, Jianping Cheng, Yuanjing Li, Yinong Liu, Hua Peng, Tiezhu Li, Ziran Zhao, Yaohong Liu, Wanlong Wu
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Patent number: 8841627Abstract: A method for imaging an object by means of photoneutron transmission is provided. The method determines the position of the photoneutron rays based on the position of a neutron collimator, to overcome the problem of incapability of imaging due to loss of position information of the photoneutrons during moderation thereof. The method also images the object by arranging detector module arrays.Type: GrantFiled: June 13, 2010Date of Patent: September 23, 2014Assignees: Nuctech Company Limited, Tsinghua UniversityInventors: Yuanjing Li, Yigang Yang, Tiezhu Li, Qinjian Zhang, Bin Wu, Hong Wang
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Patent number: 8588370Abstract: The present invention discloses an article inspection device, comprising: a x-ray machine, a collimation unit, a transmission detector array and at least one scattering detector array. Each of the at least one scattering detector array comprising a plurality of same scattering detector modules arranged in a matrix of i-rows and j-columns. A transmission cross section of the article transmitted by the x-rays is divided into a plurality of same sub-regions arranged in a matrix of i-rows and j-columns. The plurality of scattering detector modules arranged in i-rows and i-columns correspond to the plurality of sub-regions arranged in i-rows and j-columns one by one for detecting pair production effect annihilation photons and Compton-effect scattering photons from the respective sub-regions.Type: GrantFiled: December 29, 2010Date of Patent: November 19, 2013Assignees: Tsinghua University, Nuctech Company LimitedInventors: Yigang Yang, Tiezhu Li, Qinjian Zhang, Yi Zhang, Yingkang Jin, Qinghao Chen, Yuanjing Li, Yinong Liu
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Patent number: 8406375Abstract: The present invention discloses an article inspection device, comprising: an x-ray machine, a collimation unit, a transmission detector array and a scattering detector array. The scattering detector array comprising a plurality of same scattering detector modules arranged in a matrix of i-rows and j-columns. A transmission cross section of the article transmitted by the x-rays is divided into a plurality of same sub-regions arranged in a matrix of i-rows and j-columns. The plurality of scattering detector modules arranged in i-rows and j-columns correspond to the plurality of sub-regions arranged in i-rows and j-columns one by one for detecting pair production effect annihilation photons and Compton-effect scattering photons from the respective sub-regions. Obtaining atomic numbers of the respective sub-regions based on a ratio of the pair production effect annihilation photon count to the Compton-effect scattering photon count, so as to form a three-dimensional image of the article.Type: GrantFiled: December 28, 2010Date of Patent: March 26, 2013Assignees: Tsinghua University, Nuctech Company LimitedInventors: Yigang Yang, Tiezhu Li, Qinjiar Zhang, Yi Zhang, Yingkang Jin, Qinghao Chen, Yuanjing Li, Yinong Liu
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Patent number: 8396189Abstract: A photoneutron-x ray source includes a photoneutron conversion target, which outputs both photoneutrons and x-rays simultaneously. The photoneutron-x ray source includes an x-ray generator for generating an x-ray main beam that is applied to the photoneutron conversion target. The photoneutron conversion target generates photoneutrons upon the application of the x-ray main beam to the photoneutron conversion target. The photoneutron conversion target has a body that defines a passageway extending through the body and that is structured such that a first x-ray beam of the x-ray main beam can pass through the passageway without any reaction with the body, while a second x-ray beam of the x-ray main beam can enter the body and react with the body to emit the photoneutrons.Type: GrantFiled: June 19, 2008Date of Patent: March 12, 2013Assignees: Tsinghua University, Nuctech Company LimitedInventors: Kejun Kang, Haifeng Hu, Yigang Yang, Zhiqiang Chen, Qitian Miao, Jianping Cheng, Yuanjing Li, Yinong Liu, Hua Peng, Tiezhu Li, Ziran Zhao, Yaohong Liu, Wanlong Wu
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Patent number: 8374310Abstract: A method and a system for contraband detection in an object using photoneutrons and x-rays includes an x-ray generator that generates an x-ray main beam including a first x-ray beam and a second x-ray beam, the first x-ray beam being directed to pass through the object. A photoneutron conversion target is arranged to receive the second x-ray beam so as to generate photoneutrons, the photoneutrons being directed to enter the object and react with the object to emit characteristic ?-rays. An x-ray detecting arrangement is arranged to receive the first x-ray beam that has passed through the object in order to perform x-ray imaging detection of the detected object. A ?-ray detecting arrangement is arranged to receive the characteristic ?-rays in order to perform neutron detection of the object based on the characteristic ?-rays. The x-ray imaging detection and the neutron detection are simultaneously performed.Type: GrantFiled: June 19, 2008Date of Patent: February 12, 2013Assignees: Tsinghua University, Nuctech Company LimitedInventors: Kejun Kang, Haifeng Hu, Yigang Yang, Zhiqiang Chen, Qitian Miao, Jianping Cheng, Yuanjing Li, Yinong Liu, Hua Peng, Tiezhu Li, Ziran Zhao, Yaohong Liu, Wanlong Wu
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Publication number: 20130026383Abstract: A method for imaging an object by means of photoneutron transmission is provided, which comprises the steps of: collimating the photoneutron rays passing through the object by means of a neutron collimator so as to determine the position information of the photoneutron rays based on the position of the neutron collimator; detecting the collimated photoneutron ray beams by means of a detector module, wherein the detector module includes a neutron moderator and at least one thermal neutron detector located within the neutron moderator, wherein the neutron moderator converts the photoneutrons into thermal neutrons, and wherein the thermal neutron detector measures the thermal neutrons so as to obtain attenuation information of the photoneutron ray beams upon passing through the object; and integrating the position information and the attenuation information so as to form an image of the corresponding part of the object.Type: ApplicationFiled: June 13, 2010Publication date: January 31, 2013Applicants: TSINGHUA UNIVERSITY, NUCTECH COMPANY LIMITEDInventors: Yuanjing Li, Yigang Yang, Tiezhu Li, Qinjian Zhang, Bin Wu, Hong Wang
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Publication number: 20120207271Abstract: The present invention discloses an article inspection device, comprising: an x-ray machine, a collimation unit, a transmission detector array and a scattering detector array. The scattering detector array comprising a plurality of same scattering detector modules arranged in a matrix of i-rows and j-columns. A transmission cross section of the article transmitted by the x-rays is divided into a plurality of same sub-regions arranged in a matrix of i-rows and j-columns. The plurality of scattering detector modules arranged in i-rows and j-columns correspond to the plurality of sub-regions arranged in i-rows and j-columns one by one for detecting pair production effect annihilation photons and Compton-effect scattering photons from the respective sub-regions. Obtaining atomic numbers of the respective sub-regions based on a ratio of the pair production effect annihilation photon count to the Compton-effect scattering photon count, so as to form a three-dimensional image of the article.Type: ApplicationFiled: December 28, 2010Publication date: August 16, 2012Inventors: Yigang Yang, Tiezhu Li, Qinjian Zhang, Yi Zhang, Yingkang Jin, Qinghao Chen, Yuanjing Li, Yinong Liu
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Publication number: 20120002788Abstract: The present invention discloses an article inspection device, comprising: a x-ray machine, a collimation unit, a transmission detector array and at least one scattering detector array. Each of the at least one scattering detector array comprising a plurality of same scattering detector modules arranged in a matrix of i-rows and j-columns. A transmission cross section of the article transmitted by the x-rays is divided into a plurality of same sub-regions arranged in a matrix of i-rows and j-columns. The plurality of scattering detector modules arranged in i-rows and i-columns correspond to the plurality of sub-regions arranged in i-rows and j-columns one by one for detecting pair production effect annihilation photons and Compton-effect scattering photons from the respective sub-regions.Type: ApplicationFiled: December 29, 2010Publication date: January 5, 2012Inventors: Yigang Yang, Tiezhu Li, Qinjian Zhang, Yi Zhang, Yingkang Jin, Qinghao Chen, Yuanjing Li, Yinong Liu
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Publication number: 20100266103Abstract: A photoneutron-x ray source includes a photoneutron conversion target, which outputs both photoneutrons and x-rays simultaneously. The photoneutron-x ray source includes an x-ray generator for generating an x-ray main beam that is applied to the photoneutron conversion target. The photoneutron conversion target generates photoneutrons upon the application of the x-ray main beam to the photoneutron conversion target. The photoneutron conversion target has a body that defines a passageway extending through the body and that is structured such that a first x-ray beam of the x-ray main beam can pass through the passageway without any reaction with the body, while a second x-ray beam of the x-ray main beam can enter the body and react with the body to emit the photoneutrons.Type: ApplicationFiled: June 19, 2008Publication date: October 21, 2010Inventors: Kejun Kang, Haifeng Hu, Yigang Yang, Zhiqiang Chen, Qitian Miao, Jianping Cheng, Yuanjing Li, Yinong Liu, Hua Peng, Tiezhu Li, Ziran Zhao, Yaohong Liu, Wanlong Wu
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Publication number: 20100243874Abstract: A photoneutron conversion target for generating photoneutrons by directing an x-ray beam at the photoneutron conversion target includes an elongated body having a first end and a second end. When the photoneutron conversion target is in use, the x-ray beam enters the body and propagates in a direction from the first end to the second end. The body of the photoneutron conversion target is shaped such that propagation of the x-ray beam is substantially proportionate to an intensity distribution of the x-ray beam, so that the greater an intensity of x-rays of the x-ray beam, the greater the propagation distance of the x-rays within the body of the photoneutron conversion target. The photoneutron conversion target according to the invention can make full use of the x-ray beam so as to increase a yield of photoneutrons.Type: ApplicationFiled: June 19, 2008Publication date: September 30, 2010Inventors: Kejun Kang, Haifeng Hu, Yigang Yang, Zhiqiang Chen, Qitian Miao, Jianping Cheng, Yuanjing Li, Yinong Liu, Hua Peng, Tiezhu Li, Ziran Zhao, Yaohong Liu, Wanlong Wu