公开(公告)号：US5604783A

公开(公告)日：1997-02-18

申请号：US609208

申请日：1996-03-01

Applicant: Georges Charpak

Inventor： Georges Charpak

IPC: G01T1/29 ,  H01J47/00 ,  H01J47/06 ,  G01T1/185

CPC classification number: H01J47/062 ,  G01T1/2935 ,  H01J47/008

Abstract: The invention relates to a medical imaging device using X or gamma ionizing radiation. It comprises a source (S) of radiation in a divergent beam, and a longitudinal slit (F) delivering a sheet-form beam in a plane containing the slit (F). A detection module (1) is provided, which comprises a drift chamber (12) and a multiwire chamber which are filled with a gas. The chambers comprise, in a direction orthogonal to the plane containing the slit (F), the drift space (12) for the electrons, comprising a cathode electrode (11), a converter (121), a proportional multiplier anode (13) for generating multiplied electrons and corresponding ions, and a second cathode electrode (14), placed in the vicinity of the multiplier anode (13). The multiplier anode (13) and the second cathode electrode (14) consist of conductor elements extending in two parallel planes, along substantially orthogonal directions, in order to permit two-dimensional localization of the electrons in this plane.

Abstract translation: 本发明涉及使用X或γ电离辐射的医学成像装置。 它包括发散光束中的辐射源（S）和在包含狭缝（F）的平面中传送片状光束的纵向狭缝（F）。 提供一种检测模块（1），其包括填充有气体的漂移室（12）和多线室。 这些腔室在垂直于包含狭缝（F）的平面的方向上包括用于电子的漂移空间（12），包括阴极电极（11），转换器（121），比例乘法器阳极（13） 产生倍增电子和相应的离子，以及放置在乘法器阳极（13）附近的第二阴极电极（14）。 乘法器阳极（13）和第二阴极电极（14）由沿着大致正交的方向在两个平行平面中延伸的导体元件组成，以允许电子在该平面中的二维定位。

公开(公告)号：US12040168B2

公开(公告)日：2024-07-16

申请号：US17766203

申请日：2020-10-01

Applicant: Optical Systems, LLC

Inventor： Arash Ghorbani

IPC: H01J47/00 ,  H01J9/26

CPC classification number: H01J47/008 ,  H01J9/26 ,  H01J47/002

Abstract: A drift tube construction includes a thin wall aluminum tube with a thin wire at its center attached to a terminal. The tube is plugged at both ends. The terminal is embedded at the center of the plug with material insulating it from Drift tube main body. The Drift tube assembly is sealed and filled with a gas mixture. A voltage is applied to the thin wire via the terminal. Current drift tubes employ plastic material to insulate the terminal from Drift tube main body and O-rings to provide a near hermetic seal.

公开(公告)号：US06340819B1

公开(公告)日：2002-01-22

申请号：US09370769

申请日：1999-08-09

Applicant: Roger D. Durst ,  Sean N. Carney ,  Yacouba Diawara ,  Rudolph Shuvalov

Inventor： Roger D. Durst ,  Sean N. Carney ,  Yacouba Diawara ,  Rudolph Shuvalov

IPC: G01J528

CPC classification number: H01J47/02 ,  H01J47/008

Abstract: A detection apparatus for detecting an electron cloud includes a resistive anode layer with a detection plane upon which the electron cloud is incident. The resistive layer is capacitively coupled to a readout structure having a conductive grid parallel to the detection plane. Charge on the resistive layer induces a charge on the readout structure, and currents in the grid. The location of the induced charge on the readout structure corresponds to the location on the detection plane at which the electron cloud is incident. Typically, the detection apparatus is part of a detector, such as a gas avalanche detector, in which the electron cloud is formed by conversion of a high-energy photon or particle to electrons that undergo avalanche multiplication. The spacing between the anode layer and the readout structure is selected so that the width of the charge distribution matches the pitch between conductive segments of the grid. The resistivity of the anode layer is selected to be low enough to support the highest bandwidth of the readout electronics, but high enough to allow penetration of the charge through the anode layer to the readout structure.

Abstract translation: 用于检测电子云的检测装置包括具有电子云入射的检测面的电阻性阳极层。 电阻层电容耦合到具有平行于检测平面的导电栅格的读出结构。 电阻层上的电荷在读出结构上引起电荷，并在电网中产生电流。 读出结构上感应电荷的位置对应于电子云入射的检测平面上的位置。 通常，检测装置是诸如气体雪崩检测器的检测器的一部分，其中通过将高能光子或粒子转换成经历雪崩倍增的电子而形成电子云。 选择阳极层和读出结构之间的间隔，使得电荷分布的宽度与栅格的导电段之间的间距相匹配。 选择阳极层的电阻率足够低以支持读出电子器件的最高带宽，但足够高以允许电荷穿过阳极层到达读出结构。

公开(公告)号：US5095206A

公开(公告)日：1992-03-10

申请号：US687594

申请日：1991-04-17

Applicant: Allan T. Bacon, Jr. ,  Julio A. Reategui

Inventor： Allan T. Bacon, Jr. ,  Julio A. Reategui

IPC: G01N27/64 ,  H01J47/00

CPC classification number: G01N27/622 ,  H01J47/008

Abstract: An improved ion mobility spectrometer (IMS) and method for operating the same which enables analysis of a specific acid gas analyte in a mixture of such gases when air is used as the carrier gas and the drift gas in the IMS. A controlled concentration of sulfur dioxide dopant is added to the air carrier gas stream prior to application of the carrier gas stream. In the IMS, the drift times of the ions generated from the doped air carrier gas differ from the drift times of the ions generated from the acid gas analyte, thereby enabling identification and quantification of the analyte.

Abstract translation: 改进的离子迁移谱仪（IMS）及其操作方法，当使用空气作为载体气体和IMS中的漂移气体时，能够分析这些气体的混合物中的特定酸性气体分析物。 在施加载气流之前，向空气载气流中加入受控浓度的二氧化硫掺杂剂。 在IMS中，从掺杂的空气载气产生的离子的漂移时间与从酸性气体分析物产生的离子的漂移时间不同，从而能够鉴定和定量分析物。

公开(公告)号：US5071381A

公开(公告)日：1991-12-10

申请号：US490078

申请日：1990-03-07

Applicant: Leonard Schieber

Inventor： Leonard Schieber

IPC: G01T1/18 ,  G01T1/28 ,  H01J9/24 ,  H01J37/244 ,  H01J43/20 ,  H01J47/00

CPC classification number: H01J47/008 ,  Y10T156/1002

Abstract: A process for manufacturing straw tube drift chambers in an array configuration is provided. The process of manufacturing the straw tubes includes the construction of an array of tube sections, followed by the positioning of a conductive wire, and then closing the tubes. The completed straw tube array, when filled with ionizable gases, are configured about a particle accelerator collision point to provide a means for detecting the products of the collision (secondary particles) as they pass through the straw tube chambers.

公开(公告)号：US4954710A

公开(公告)日：1990-09-04

申请号：US343627

申请日：1989-04-27

Applicant: Vincent Comparat ,  Jean Ballon ,  Pierre Carrechio ,  Alain Pelissier

Inventor： Vincent Comparat ,  Jean Ballon ,  Pierre Carrechio ,  Alain Pelissier

IPC: H01J37/244 ,  G01T1/18 ,  H01J47/00 ,  H01J47/06 ,  H01J49/06

CPC classification number: H01J47/06 ,  H01J47/008

Abstract: An X-ray gas detector for analyzing a material by studying X-ray diffraction. In order to minimize the parallax error without resorting to auxiliary electrodes, difficult to manufacture, a radial field in the whole gas space (40) is generated only by means of input electrodes (36) set to appropriate voltages and by means of lateral electrodes (44) also individually set to appropriate voltages. By modifying the voltages, it is also possible to move the center of the spheric equipotentials for permitting the analysis without parallax error of samples (20) placed at variable distances (D) from mthe input window (32) of the detector.

Abstract translation: 一种用于通过研究X射线衍射分析材料的X射线气体检测器。 为了最小化视差误差而不借助于辅助电极，难以制造，整个气体空间（40）中的径向场仅通过设置为适当电压的输入电极（36）和借助于横向电极（ 44）也单独设置为适当的电压。 通过修改电压，也可以移动球面等电位的中心，以允许分析，而不会在距离检测器的输入窗口（32）处置于可变距离（D）处的样本（20）的视差误差。