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公开(公告)号：US11614413B2
公开(公告)日：2023-03-28
申请号：US17255968
申请日：2020-01-03
Inventor： Jianmin Li , Li Zhang , Yuanjing Li , Zhiqiang Chen , Hao Yu , Shangmin Sun , Bicheng Liu , Weizhen Wang , Dongyu Wang , Yuan Ma , Yu Hu , Chunguang Zong
IPC: G01N23/20008 , G01N23/203
Abstract: The present disclosure provides a back scattering inspection system and a back scattering inspection method. The back scattering inspection system includes a frame and a back scattering inspection device. The rack includes a track arranged vertically or obliquely relative to the ground, and a space enclosed by the track forms an inspection channel; and the back scattering inspection device includes a back scattering ray emitting device and a back scattering detector, and the back scattering inspection device is movably disposed on the track for inspecting an inspected object passing through the inspection channel. The back scattering inspection system can perform back scattering inspection on a plurality of surfaces of the inspected object.
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公开(公告)号：US11022581B2
公开(公告)日：2021-06-01
申请号：US16727612
申请日：2019-12-26
Applicant: NUCTECH COMPANY LIMITED , Tsinghua University
Inventor： Qingjun Zhang , Yuanjing Li , Zhiqiang Chen , Jianmin Li , Yaohong Liu , Weiping Zhu , Qiufeng Ma , Biao Cao , Ge Li , Wei Wang , Lili Yan , Guangqin Li
IPC: G01N27/00 , G01N27/622 , H01J49/04
Abstract: Embodiments of the present disclosure provide an ion mobility spectrometer device. The ion mobility spectrometer device includes: an ion mobility tube, a sampling device, and a sampling and circulating gas path. The sampling device includes a solid sample desorption device and a gas sampling device. The solid sample desorption device is configured to process the solid sample into a first mixed gas containing the solid sample, and the gas sampling device is configured to process the gas sample into a second mixed gas containing the gas sample. The sampling and circulating gas path is configured to transfer the first mixed gas and/or the second mixed gas into the ion mobility tube for detection.
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公开(公告)号：US20210118656A1
公开(公告)日：2021-04-22
申请号：US16947998
申请日：2020-08-27
Applicant: Nuctech Company Limited , Tsinghua University
Inventor： Qingjun Zhang , Zhiqiang Chen , Yuanjing Li , Jianmin Li , Yinong Liu , Yaohong Liu , Guangqin Li , Weiping Zhu , Ge Li , Qiufeng Ma , Biao Cao
Abstract: Embodiments of the present disclosure provide a real-time calibration device, a real-time calibration method and a detection apparatus. The real-time calibration device is in fluid communication with a sample injection pipeline of the apparatus to be calibrated. The real-time calibration device is configured to release a trace amount of calibration agent molecules during a sample injection of the apparatus to be calibrated, so that the trace amount of calibration agent molecules and a sample entering the apparatus to be calibrated are mixed and together enter the apparatus to be calibrated, and information of the sample and the calibration agent is detected by the apparatus to be calibrated, thereby performing a calibration.
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公开(公告)号：US10948427B2
公开(公告)日：2021-03-16
申请号：US16231373
申请日：2018-12-21
Applicant: Tsinghua University , Nuctech Company Limited
Inventor： Ke Li , Jianmin Li , Weifeng Yu , Yulan Li , Xuejing Yang , Yuanjing Li , Chunguang Zong , Zhiqiang Chen , Li Zhang
IPC: G01N23/04
Abstract: The present disclosure provides a scanned image correction apparatus, method and a mobile scanning device. The apparatus includes an image collector, an arm swing detector, and an image processor. The image collector is configured to collect a scanned image of an object under inspection during a scanning process of scanning the object under inspection by the mobile scanning device, and determine an image parameter of the scanned image. The arm swing detector is disposed at a monitor point on a detector arm of the mobile scanning device, and configured to detect a displacement offset of the detector arm in a specified direction and build an arm swing model of the detector arm. The image processor is configured to determine a change relationship between the image parameter of the scanned image and the displacement offset of the detector arm, and correct the scanned image based on the change relationship.
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公开(公告)号：US10896527B2
公开(公告)日：2021-01-19
申请号：US16045303
申请日：2018-07-25
Applicant: Tsinghua University , NUCTECH COMPANY LIMITED
Inventor： Yuxiang Xing , Li Zhang , Jianmin Li , Zhiqiang Chen , Jianping Gu
Abstract: A method and device for reconstructing a CT image and a storage medium are disclosed. CT scanning is performed on an object to be inspected to obtain projection data. The projection data is processed using a first convolutional neural network to obtain processed projection data. The first convolutional neural network comprises a plurality of convolutional layers. A back-projection operation is performed on the processed projection data to obtain a reconstructed image.
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Patent Agency Ranking
公开(公告)号：US10795050B2
公开(公告)日：2020-10-06
申请号：US16233387
申请日：2018-12-27
Applicant: TSINGHUA UNIVERSITY , Nuctech Company Limited
Inventor： Ying Li , Jianmin Li , Jinguo Cao , Yuan Ma , Yulan Li , Yuan He , Yuanjing Li , Hui Meng , Zhiqiang Chen , Yiwei Guo , Li Zhang
Abstract: A vehicle detection system includes a transverse detector arm, two vertical detector arms, a radiation source, a plurality of transverse detectors, and a plurality of vertical detectors. The transverse detector arm may be disposed on the ground. Two vertical detector arms are disposed at both ends of the transverse detector arm. The radiation source is located above the transverse detector arm. A plurality of transverse detectors are disposed within the transverse detector arm and are laid along a length direction of the transverse detector arm for receiving ray emitted by the radiation source. The plurality of vertical detectors are symmetrically disposed on the two vertical detector arms, and each of the vertical detectors is disposed towards a center point of the radiation source for receiving ray emitted by the radiation source.
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公开(公告)号：US10607483B2
公开(公告)日：2020-03-31
申请号：US15300947
申请日：2015-12-23
Applicant: Nuctech Company Limited , Tsinghua University
Inventor： Zhiqiang Chen , Li Zhang , Jianmin Li , Ziran Zhao , Yaohong Liu , Qiang Li , Zheng Hu , Jianping Gu , Ying Li
Abstract: Disclosed is a vehicle identification method and system. The method includes: acquiring appearance information of an inspected vehicle; obtaining external features of the vehicle based on the appearance information; acquiring a transmission image of the vehicle and obtaining internal features of the vehicle from the transmission image; forming descriptions on the vehicle at least based on the external features and the internal features; and determining a vehicle model of the vehicle from a vehicle model databased by utilizing the descriptions. This method merges various types of modality information, especially introducing the transmission image, and combines the internal structure information with the appearance information, so that the present disclosure can identify a vehicle model more practically.
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公开(公告)号：US10448904B2
公开(公告)日：2019-10-22
申请号：US16232072
申请日：2018-12-26
Applicant: TSINGHUA UNIVERSITY , NUCTECH COMPANY LIMITED
Inventor： Liang Li , Zhiqiang Chen , Kejun Kang , Ziran Zhao , Li Zhang , Yuxiang Xing , Tiao Zhao , Jianmin Li , Bicheng Liu , Qian Yi
Abstract: The present disclosure provides a decomposition method based on basis material combination. In the present disclosure, a scanned object is divided into a plurality of regions, the basis material combinations used in each of the divided regions are different each other, and the scanned object is re-divided according to the re-determined equivalent atomic number of its each point until the change on decomposition coefficient meets certain conditions. Thereby, a decomposition method based on dynamic basis material combinations is realized, which reduces a decomposition error caused by improper selection of the basis material combination and improves the accuracy of the decomposition and substance identification of the multi-energy CT.
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公开(公告)号：US10397491B2
公开(公告)日：2019-08-27
申请号：US14981947
申请日：2015-12-29
Applicant: NUCTECH COMPANY LIMITED
Inventor： Mingliang Li , Yuanjing Li , Jianmin Li , Ying Li , Zhiqiang Chen , Kejun Kang
Abstract: The present invention relates to a photogrammetry system and method. The photogrammetry system comprises: photographing devices capable of photographing an object at a predetermined time interval; and, a data processing device capable of calculating an actual length of the object or a certain portion on the object according to a length of the object or a certain portion on the object in the images obtained by the photographing devices and a distance of the object in the two images, wherein the object moves at a speed V; the photographing devices photograph the object for two times at a time interval t; the distance of the object in the two images obtained by the two times of photographing is Dp; the length of the object or a certain portion on the object in the images is Lp; and, the actual length L of the object or a certain portion on the object may be obtained by the following formula: L = Lp × Vt Dp .
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公开(公告)号：US10302578B2
公开(公告)日：2019-05-28
申请号：US15494884
申请日：2017-04-24
Applicant: Tsinghua University , Nuctech Company Limited
Inventor： Liang Li , Zhiqiang Chen , Kejun Kang , Li Zhang , Ziran Zhao , Yuxiang Xing , Jianmin Li , Yulan Li , Tiao Zhao
IPC: G01N23/046 , G01N23/087
Abstract: Methods and system for decomposing a high-energy dual-energy X-ray CT material are disclosed. In the method, two types of effect such as Compton effect and electron pairing effect which dominates are reserved and the influence of the other effect such a photoelectric effect is removed so as to improve the accuracy of the material decomposition. The unique advantage of the present disclosure is to effectively remove the error of the calculated atomic number Z due to directly selecting two effects during processes of material decomposition in the conventional dual-energy CT method. This may greatly improve the accuracy of dual-energy CT identification of the material, and it is important to improve the conventional dual-use CT imaging system applications, such as clinical therapy, security inspection, industrial non-destructive testing, customs anti-smuggling and other fields.
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