Patents by Inventor Kejun Kang

Kejun Kang 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).

  • Publication number: 20090129544
    Abstract: A method for substance identification and an apparatus thereof are disclosed.
    Type: Application
    Filed: November 14, 2008
    Publication date: May 21, 2009
    Inventors: Zhiqiang Chen, Li Zhang, Kejun Kang, Xuewu Wang, Qingping Huang, Yuanjing Li, Yinong Liu, Ziran Zhao, Yongshun Xiao
  • Publication number: 20090087026
    Abstract: The present invention provides a method and system of material identification using binocular steroscopic and multi-energy transmission image. With the method, any obstacle that dominates the ray absorption can be peeled off from the objects that overlap in the direction of a ray beam. The object that is unobvious due to a relatively small amount of ray absorption will thus stand out, and the material property of the object, such as organic, mixture, metal and the like can be identified. This method lays a fundament for automatic identification of harmful objects, such as explosive, drugs, etc., concealed in a freight container.
    Type: Application
    Filed: July 28, 2008
    Publication date: April 2, 2009
    Inventors: Yali Xie, Qitian Miao, Hua Peng, Kejun Kang, Haifeng Hu, Zhiqiang Chen, Xueguang Cao, Chuanxiang Tang, Jianping Gu, Xuewu Wang, Hongsheng Wen, Bei He, Yaohong Liu, Shangmin Sun, Quanwei Song, Jin Lin, Xianli Ding
  • Patent number: 7512213
    Abstract: A multiple-view-angle cargo security inspection method for inspecting an object using a cargo security inspection system, the cargo security inspection system including a radiation source for generating a beam of rays for transmitting through the object to be inspected and a data collecting unit for collecting the transmission projection data after the beam of rays has transmitted through the inspected object, the method including a scanning step including: rotating the radiation source and/or the object about a rotation axis so as to achieve a relative rotation, thereby positioning the radiation source in a plurality of discrete positions with different view angles with respect to the inspected object, wherein, in each view angle, the radiation source moves along a straight line in a direction parallel to the rotation axis and at the same time scans the inspected object so as to acquire the transmission projection data at each view angle.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: March 31, 2009
    Assignees: Tsinghua University, Nuctech Company Limited
    Inventors: Li Zhang, Zhiqiang Chen, Kejun Kang, Haifeng Hu, Yuxiang Xing, Xinhui Duan, Yongshun Xiao, Ziran Zhao, Yuanjing Li, Yinong Liu
  • Patent number: 7508908
    Abstract: A CT method and an apparatus for liquid safety-detection with a radiation source relate to a radiation imaging detecting technology field. The invention comprises using a radiation source, a detector and data collector, a computer data processor; and the main steps are: 1) a liquid article to be detected being placed onto a rotary platform which is rotatable; 2) the ray emitted from the radiation source passing through the liquid article, and being received and formed into projection data by the detector and data collector; and 3) the projection data being transmitted to the computer data processor, which processes it to obtain the liquid density of the detected article, compares the result with the densities of dangerous articles in a current database, and then visually displays the detected information of the detected liquid article.
    Type: Grant
    Filed: November 23, 2005
    Date of Patent: March 24, 2009
    Assignees: Tsinghua University, Nuntech Company Limited
    Inventors: Haifeng Hu, Yuanjing Li, Kejun Kang, Zhiqiang Chen, Yinong Liu, Yulan Li, Li Zhang, Wanlong Wu, Ziran Zhao, Xilei Luo, Bin Sang
  • Publication number: 20090060128
    Abstract: A device for inspecting contraband in an aviation cargo containers includes: a turntable located at an object inspecting position and configured to carry the object to be inspected and bring the object into rotation; an object conveying system; a scanning system including a radiation source and a detector which can synchronously move in the vertical direction; a turntable drive/control system which drives and controls rotation of said turntable so that the turntable can continuously rotate about its rotation axis or rotate to any predetermined angular position; a scanning drive/control system which drives and controls the radiation source and the detector into synchronous movement in the vertical direction so that the radiation source and the detector can continuously move in the vertical direction or move to any predetermined vertical position. The device of the present invention can scan the object and form images in various scanning modes to meet different needs.
    Type: Application
    Filed: September 4, 2008
    Publication date: March 5, 2009
    Inventors: Kejun KANG, Ziran ZHAO, Hua PENG, Zhiqiang CHEN, Yuanjing LI, Yinong LIU, Li ZHANG, Yaohong LIU, Zhizhong LIANG, Dongmao LI, Cong LIU, Huabin TAN, Yongpeng LIU, Xinhui DUAN, Xueyou ZHOU
  • Publication number: 20090060129
    Abstract: A device for inspecting contraband in an aviation cargo container includes: a turntable and a scanning system, the scanning system including a radiation source; a detector; a radiation source mounting structure; and a detector mounting structure for mounting the detector. Each of said radiation source mounting structure and said detector mounting structure includes at least one column assembly. The radiation source and the detector are mounted on the column assembly and allowed to synchronously ascend and descend along said column assembly. By combining different movement modes of the turntable and the scanning system, the device of the present invention can scan the object in various scanning modes. The device is stable in structure, convenient in installation, and occupies a small space. The device can inspect aviation containers over two meters long and/or over two meters wide and achieve a relatively high passing rate of the objects.
    Type: Application
    Filed: September 4, 2008
    Publication date: March 5, 2009
    Inventors: Kejun KANG, Ziran ZHAO, Hua PENG, Zhiqiang CHEN, Yuanjing LI, Yinong LIU, Li ZHANG, Yaohong LIU, Zhizhong LIANG, Dongmao LI, Cong LIU, Huabin TAN, Yongpeng LIU, Xinhui DUAN, Xueyou ZHOU
  • Patent number: 7499522
    Abstract: A cargo security inspection system inspecting an object moving through the system, including: a mechanical conveyance unit carrying, conveying, and defining a travel path of the object in the system; a radiation-generating unit generating ray beams for transmitting through the object; and a data collecting unit collecting transmission data about the rays having already transmitted through the object and processing the transmission data; wherein the travel path includes at least two linear sub-paths at an angle relative to each other; the data collecting unit includes at least two detector arrays receiving ray beams, each detector array corresponding to one linear sub-path, a receiving plane of each of the detector arrays disposed parallel to its corresponding linear sub-path; and in use, the radiation-generating and data collecting units remain stationary, and the object travels along its travel path and only translates on the at least two linear sub-paths without any rotation.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: March 3, 2009
    Assignees: Tsinghua University, Nuctech Company Limited
    Inventors: Zhiqiang Chen, Li Zhang, Kejun Kang, Haifeng Hu, Yuanjing Li, Yinong Liu, Hewei Gao, Ziran Zhao, Yuxiang Xing, Yongshun Xiao, Jianmin Li
  • Patent number: 7497618
    Abstract: A mobile vehicle inspection system includes a moving device; a driving device for driving the moving device to move during scanning inspection; a radiation source disposed on the moving device for emitting a ray; a rotary table pivotally disposed on the moving device; an upright post installed on the rotary table at a lower end of the upright post; transverse detector beam having an end connected with an upper end of the upright post; the upright detector beam having an upper end connected with the other end of the transverse detector beam, and extending downwards from the other end of the transverse detector beam so that the upright post, the transverse detector beam and the upright detector beam constitute a frame of a substantial inverted ā€œUā€ shape, a ray emitted from the radiation source so as to inspect a vehicle to be inspected which passes through the inverted-ā€œUā€-shaped frame.
    Type: Grant
    Filed: October 12, 2007
    Date of Patent: March 3, 2009
    Assignees: Tsinghua University, Nuctech Company Limited
    Inventors: Zhiqiang Chen, Kejun Kang, Haifeng Hu, Yuanjing Li, Hua Peng, Chuanxiang Tang, Shangmin Sun, Yinong Liu, Jianmin Li, Junli Li, Li Zhang, Yaohong Liu, Nan Jiang, Zhongrong Yang, Tao Wang
  • Publication number: 20090010387
    Abstract: The present invention discloses an radiation imaging system, comprising: an accelerator for generating rays which penetrate through the objects to be inspected and an synchronous signal; a detector with a plurality of detecting modules, adapted for detecting rays; a signal processor for generating a selection signal according to the synchronous signal, so as to select a detecting module for detecting the rays; a data converter for converting the signal detected by said detecting module into digital data, and then buffering the digital data in said signal processor; and a communication controller connected to an image processor, adapted for transmitting the digital data buffered in said signal processor to said image processor. The system according to the present invention allows high-speed and stable data acquisition and data conversion and accurate and reliable data transmission, when the data amount is significant.
    Type: Application
    Filed: July 1, 2008
    Publication date: January 8, 2009
    Inventors: Kejun Kang, Zhiqiang Chen, Yuanjing Li, Liming Wang, Yinong Liu, Shangmin Sun, Li Zhang, Yaohong Liu, Guang Yang, Qingjun Zhang, Wenguo Liu, Siyuan Liang, Zhenbin Guo, Bin Hu, Yanli Deng, Yucheng Wu
  • Publication number: 20090003516
    Abstract: An X-CT scan system includes a base, an object rotary support, an X-ray generation device and a data acquisition system, wherein one side of the detector is leveled to or beyond the prolong line of the connecting line between the X-ray source of the X-ray generation device and the center of the object rotary support, the length of the beyond portion is less than the radius of the imaging field. The advantage of the invention is in that the invention can reconstruct the entire image of the object by means of X-ray projection data which only covers half of the area of the object. Compared with the traditional CT scan system, half of the detector size can be saved at most. The X-CT scan system is simplified and the projection data amount for scan and computation amount for image reconstruction are also reduced with the reconstructed image quality guaranteed.
    Type: Application
    Filed: December 14, 2006
    Publication date: January 1, 2009
    Inventors: Zhiqiang Chen, Kejun Kang, Li Zhang, Haifeng Hu, Yuxiang Xing, Liang Li, Yongshun Xiao, Ziran Zhao, Yuanjing Li, Yinong Liu
  • Publication number: 20090006019
    Abstract: Disclosed are a method and a device for inspection of drugs concealed in liquid articles without opening the outer packages. The method comprises the steps of: emitting radiation beams to transmit through the liquid article; receiving the radiation beams transmitted through the liquid article to get multi-angle projection data; inversely operating the multi-angle projection data based on the uniformity of the liquid article to obtain an attribute value of the inspected liquid article; retrieving a reference attribute value in a pre-created database by using the identification information of the liquid article as an index, and calculating a difference between the calculated attribute value and the reference attribute value; and determining whether the difference is larger than a predefined threshold value; wherein it is concluded that there are drugs concealed in the liquid article when the difference is determined to be larger than the predefined threshold value.
    Type: Application
    Filed: April 9, 2008
    Publication date: January 1, 2009
    Inventors: Kejun Kang, Zhiqiang Chen, Haifeng Hu, Yuanjing Li, Li Zhang, Yinong Liu, Xuewu Wang, Lijun Qiu, Hong Zhang
  • Publication number: 20080253517
    Abstract: A method for conducting irradiation of all logs of a whole vehicle with X-rays as a phytosanitary treatment may include: connecting a traction device and a goods carrying vehicle outside a shielding door; opening the door; the traction device pulling the vehicle into a tunnel; closing the shielding door; upon the vehicle reaching an irradiation region, accelerators generating X-rays; the traction device pulling the vehicle to pass through the irradiation region; stopping the X-rays; opening the door; the traction device pulling the vehicle away from the irradiation treatment tunnel; and disconnecting the traction device from the vehicle. A device may include a shielding structure, a tunnel formed therethrough; a rail along the tunnel; accelerators within the tunnel; and a traction device for pulling a vehicle carrying goods for quarantine treatment, the accelerators symmetrically arranged at both sides of and on the top of an irradiation region in the tunnel.
    Type: Application
    Filed: April 11, 2008
    Publication date: October 16, 2008
    Inventors: Kejun Kang, Haifeng Hu, Chuanxiang Tang, Yuanjing Li, Qitian Miao, Huayi Zhang, Junli Li, Zhiqiang Chen, Ming Hu, Ming Huang, Yaohong Liu, Wanlong Wu, Hui Zhang, Shenjin Ming
  • Publication number: 20080251156
    Abstract: For quarantine treatment of a farming and forestry product for pest control, a method and a device may irradiate logs as a phytosanitary treatment with electron beams. The method may include: spreading the logs; aligning the spread logs to be flush at one end; conveying the spread and flush logs laterally; conveying the logs longitudinally through an irradiation field formed by accelerators to provide treatment of irradiation with the electron beams; throwing the irradiated logs out; and laterally conveying the logs away. The device may include a conveying device for conveying the logs, a shielding structure surrounding the conveying device, and accelerators provided in the conveying path of the conveying device. Two or more accelerators may be provided in centrosymmetry about the conveying path.
    Type: Application
    Filed: April 11, 2008
    Publication date: October 16, 2008
    Inventors: Kejun KANG, Haifeng Hu, Chuanxiang Tang, Yuanjing Li, Qitian Miao, Huayi Zhang, Junli Li, Zhiqiang Chen, Ming Hu, Ming Huang, Yaohong Liu, Wanlong Wu, Hui Zhang, Shenjin Ming
  • Publication number: 20080232541
    Abstract: A check process may be performed without rotation of a radiation source or detector. A CT scan security check device may include a radiation source and a detector forming a radiation detection area, a conveyer mechanism conveying an article along a path, and a multidimensional movement mechanism causing a relative displacement between the article and the radiation detection area in a vertical direction and causing the article to rotate about a vertical axis. A CT scan security check method may include: 1) displacing the article relative to the radiation detection area in the vertical direction; 2) rotating the article; 3) during the checked article passing through the radiation detection area, obtaining data regarding a radiation ray that passes through the article; and 4) transmitting the data for a CT arithmetic reconstruction.
    Type: Application
    Filed: March 20, 2008
    Publication date: September 25, 2008
    Inventors: Kejun Kang, Zhiqiang Chen, Yuanjing Li, Yulan Li, Li Zhang, Yinong Liu, Ziran Zhao, Wanlong Wu, Hailin Wang, Xilei Luo, Bin Sang, Shuo Cao
  • Patent number: 7424089
    Abstract: It is disclosed a system and a method for reconstructing an image by using a straight-line trajectory scan to avoid image spatial resolution reduction due to interpolations in angular direction and detector direction during data rebinning. This system comprises: a projection data conversion section for converting projection data from straight-line trajectory scan into projection data under quasi-parallel-beam scan; a filtration section for obtaining filtered projection data by convoluting the projection data under quasi-parallel-beam scan with a predetermined convolutional kernel; and a back-projection section for reconstructing an image by back-projecting the filtered projection data with a weighting factor. By using the inventive system and method, the spatial resolution in the reconstructed image is improved, and the influence of data truncation on the reconstructed image is reduced.
    Type: Grant
    Filed: October 12, 2006
    Date of Patent: September 9, 2008
    Assignees: Tsinghua University, Nuctech Company Limited
    Inventors: Li Zhang, Hewei Gao, Zhiqiang Chen, Kejun Kang, Jianping Cheng, Yuanjing Li, Yinong Liu, Yuxiang Xing, Ziran Zhao, Yongshun Xiao
  • Publication number: 20080197279
    Abstract: Disclosed is an inspection system for inspecting a cargo by using radiation, comprising: a main plate conveyor; a radiation scanning unit that spans said main plate conveyor and is provided above said main plate conveyor, for scanning the cargo provided on the main plate conveyor; auxiliary conveyors that are provided at the front end and rear end of said main plate conveyor, respectively, so as to load the cargo to be inspected onto said main plate conveyor and to unload the inspected cargo from said main plate conveyor; and lifting devices for lifting said auxiliary conveyors. The inspection system according to the present invention occupies less area, has simple corollary equipments, a lower operating cost, and excellent compatibility, and can be widely applied.
    Type: Application
    Filed: January 8, 2007
    Publication date: August 21, 2008
    Inventors: Kejun Kang, Halfeng Hu, Zhiqiang Chen, Shangmin Sun, Guang Yang, Fengjun Zhang, Yong Bi, Yucheng Wu, Jianjun Li, Rongxuan Liu
  • Patent number: 7400706
    Abstract: A method and an apparatus for liquid safety-detection by backscattering with a radiation source are provided that relate to a radiation detecting technology field.
    Type: Grant
    Filed: November 23, 2005
    Date of Patent: July 15, 2008
    Assignees: Tsinghua University, NucTech Company Limited
    Inventors: Yulan Li, Haifeng Hu, Yinong Liu, Zhiqiang Chen, Kejun Kang, Li Zhang, Wanlong Wu, Yuanjing Li, Yi Wang, Wenjun He, Mingrui Qi
  • Patent number: 7399976
    Abstract: Disclosed is a method of discriminating materials by employing fast neutron and continuous spectral X-ray and an equipment for the same. The method comprising the steps of: (a) transmitting a fast neutron beam produced by a fast neutron source and a continuous spectral X-ray beam produced by a continuous spectral X-ray source through inspected objects; (b) directly measuring the intensity of the transmitted X-rays and the intensity of the transmitted neutrons by a X-ray detector array and a neutron detector array respectively; and (c) identifying the materials of the inspected object by Z-dependency curves formed by the attenuation differences between the neutron beam and X-ray beam transmitted through different materials of the inspected object. This direct measurement of transmitted dual-ray technique has much more efficient than secondary radiations measurement such as neutron activation analysis, has much more material discrimination sensitivity than dual-energy x-ray technique.
    Type: Grant
    Filed: February 14, 2006
    Date of Patent: July 15, 2008
    Assignees: Tsinghua University, Nuctech Company Limited
    Inventors: Kejun Kang, Haifeng Hu, Yali Xie, Qitian Miao, Yigang Yang, Yuanjing Li, Zhiqiang Chen, Xuewu Wang
  • Publication number: 20080156992
    Abstract: The present invention discloses a mobile cantilever door-type container inspection system, in the art of radiation scanning imaging inspection technology. The system according to the present invention comprises a moveable scanning apparatus formed by a scanning frame and a remote control device, wherein the scanning frame comprises a radiation source and some detectors, wherein the radiation source or an apparatus cabin wherein the radiation source is disposed is connected with an L-shaped cantilever structure to form a door-type scanning frame, wherein beneath the radiation source or the apparatus cabin wherein the radiation source is disposed are provided with rollers that can reciprocatingly move on rails and are controlled by drive means. The detectors are disposed in a cross beam and a vertical beam of the cantilever structure of the door-type scanning frame. Rays of the radiation source are right in alignment with rows of detectors in the cantilever structure.
    Type: Application
    Filed: March 12, 2008
    Publication date: July 3, 2008
    Applicants: TSINGHUA UNIVERSITY, NUCTECH COMPANY LIMITED
    Inventors: Kejun Kang, Zhiqiang Chen, Qitian Miao, Yuanjing Li, Nan Jiang, Hua Peng, Xuewu Wang, Jinning Liang, Shangmin Sun, Zhizhong Liang, Quanwei Song, Yucheng Wu, Yanjun Han, Guang Yang, Bin Hu, Jingyu Gu
  • Patent number: 7386092
    Abstract: A containers/vehicles inspection system with adjustable radiation X-ray angle relates to the technical field of radiation inspection. The present invention comprises a detector arm rack equipped with detectors, a second collimator, a pulling device, and an accelerator rack with the accelerator. X-ray produced by the accelerator is right opposite to the calibrator, the first collimator and the second collimator all of which are arranged in order, wherein, said accelerator rack is further composed of a horizontal regulation mechanism for moving the base forward and afterward horizontally, a vertical regulation mechanism for moving the bending framework up and down vertically, a rotary regulation mechanism for rotating the cantilever, a pitching regulation mechanism for driving the accelerator to make pinching movement, as well as a framework formed by a base, a vertical arm, a bending framework and a cantilever.
    Type: Grant
    Filed: September 22, 2004
    Date of Patent: June 10, 2008
    Assignees: Tsinghua University, Nuctech Company Limited
    Inventors: Kejun Kang, Jianmin Li, Zhiqiang Chen, Shangmin Sun, Yucheng Wu, Wanquan Shen, Hongliang Yang, Jianxin Wang