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    • 51. 再颁专利
    • High energy x-y neutron detector and radiographic/tomographic device
    • USRE36201E
    • 1999-04-27
    • US842512
    • 1997-04-23
    • Thomas G. Miller
    • Thomas G. Miller
    • G01N23/09G01T3/06G01V5/00G01N23/222
    • G01N23/09G01T3/06G01V5/0016G01V5/005
    • An improved fast neutron x-y detector and radiographic/tomographic device utilizing a white neutron probe (4). The invention includes a multiple scattering filter (44), radiographic and tomographic imaging of the number densities of atoms in small volume increments through a sample 32 and the atomic, chemical and physical structure of a sample, (32), and neural net analysis techniques, where the neural net is trained through use of simulated volume increments. The invention detects fast neutrons over a two dimensional plane, measures the energy of the neutrons, and discriminates against gamma rays. In a preferred embodiment, the detector face is constructed by stacking separate bundles (6) of scintillating fiber optic strands (20) one on top of the other. The first x-y coordinate is determined by which bundle (6) the neutron strikes. The other x-y coordinate is calculated by measuring the difference in time of flight for the scintillation photon to travel to the opposite ends of the fiber optic strand 20. In another embodiment, the detector is constructed of discrete scintillator sections (48) connected to fiber optic strands (52) by couplers (50) functioning as lens. The fiber optic strands (52) are connected to a multi-anode photomultiplier (100) tube (56). The x-y coordinate of a neutron interaction is determined by the row and column of the affected scintillation section (48). Neutron energy for both detectors is calculated by measuring the flight time of a neutron from a point source (2) to the detector face.
    • 52. 发明授权
    • Contraband detection apparatus and method
    • 违禁检测装置及方法
    • US5606167A
    • 1997-02-25
    • US380953
    • 1995-01-31
    • Thomas G. Miller
    • Thomas G. Miller
    • G01N23/04G01N23/09G01T3/06G01T5/08G01V5/00
    • G01V5/0016G01N23/04G01N23/09G01T1/201G01T3/06
    • A contraband detection system (18) using a single, cone shaped neutron beam determines substances concealed in a sample object by developing total neutron cross section spectra for a plurality of elements, including carbon, nitrogen, oxygen, hydrogen and other potential contraband-indicating elements. A processor (26) performs a contraband determination classification based on the neutron total cross section spectra for the plurality of elements, including hydrogen and elements which do not have peaks in the energy range of interest. The contraband detection system (18) includes a neutron source (20) for producing a pulsed, cone shaped beam of fast white neutrons; a spatial neutron detection array (40); a conveyor system (28) for situating a sample object (29) between the source (20) and the detection array (40); a spectra analysis system (24) for determining the neutron total cross section spectra of elements located in the sample object; and the processor (26). The neutron source (20) produces a pulsed beam (36) of fast white neutrons having sufficient energy range whereby removal of neutrons from the beam caused by the presence of a plurality of contraband-indicating elements can be determined. Various techniques of making contraband classification determinations are also disclosed.
    • 使用单个锥形中子束的违禁检测系统(18)通过对多个元素(包括碳,氮,氧,氢和其它潜在的违禁指示元件)开发总中子截面光谱来确定隐藏在样品物体中的物质 。 处理器(26)基于多个元件的中子总截面光谱(包括氢)和在感兴趣的能量范围内没有峰值的元素执行违禁品确定分类。 违禁检测系统(18)包括用于产生快速白色中子的脉冲锥形束的中子源(20); 空间中子检测阵列(40); 用于将源(20)和检测阵列(40)之间的样本对象(29)定位的传送系统(28); 用于确定位于样品物体中的元素的中子总横截面光谱的光谱分析系统(24); 和处理器(26)。 中子源(20)产生具有足够能量范围的快速白色中子的脉冲束(36),从而可以确定由存在多个违禁指示元件引起的束的中子的去除。 还公开了进行违禁品分类确定的各种技术。
    • 53. 发明授权
    • High energy x-y neutron detector and radiographic/tomographic device
    • 高能x-y中子检测器和射线照相/断层摄影装置
    • US5410156A
    • 1995-04-25
    • US106437
    • 1993-08-13
    • Thomas G. Miller
    • Thomas G. Miller
    • G01N23/09G01T3/06G01V5/00G01N23/222
    • G01V5/0016G01N23/09G01T3/06G01V5/005
    • An improved fast neutron x-y detector and radiographic/tomographic device utilizing a white neutron probe (4). The invention includes a multiple scattering filter (44), radiographic and tomographic imaging of the number densities of atoms in small volume increments through a sample 32 and the atomic, chemical and physical structure of a sample, (32), and neural net analysis techniques, where the neural net is trained through use of simulated volume increments. The invention detects fast neutrons over a two dimensional plane, measures the energy of the neutrons, and discriminates against gamma rays. In a preferred embodiment, the detector face is constructed by stacking separate bundles (6) of scintillating fiber optic strands (20) one on top of the other. The first x-y coordinate is determined by which bundle (6) the neutron strikes. The other x-y coordinate is calculated by measuring the difference in time of flight for the scintillation photon to travel to the opposite ends of the fiber optic strand 20. In another embodiment, the detector is constructed of discrete scintillator sections (48) connected to fiber optic strands (52) by couplers (50) functioning as lens. The fiber optic strands (52) are connected to a multi-anode photomultiplier (100) tube (56). The x-y coordinate of a neutron interaction is determined by the row and column of the affected scintillation section (48). Neutron energy for both detectors is calculated by measuring the flight time of a neutron from a point source (2) to the detector face.
    • 改进的快中子x-y检测器和利用白中子探针(4)的射线照相/断层摄影装置。 本发明包括多个散射滤光器(44),通过样品32以小体积增量的原子数量密度和样品的原子,化学和物理结构(32)和神经网络分析技术 ,其中神经网络通过使用模拟体积增量进行训练。 本发明在二维平面上检测快中子,测量中子的能量,并区分伽马射线。 在优选实施例中,检测器面是通过将另一个的闪烁光纤线(20)的分开的束(6)堆叠在一起构成的。 第一个x-y坐标由中子撞击的束(6)决定。 通过测量闪烁光子行进到光纤光纤20的相对端的飞行时间差来计算另一个xy坐标。在另一个实施例中,检测器由连接到光纤的分立闪烁器部分(48)构成 通过用作透镜的耦合器(50)连接线(52)。 光纤束(52)连接到多阳极光电倍增管(100)管(56)。 中子相互作用的x-y坐标由受影响的闪烁区(48)的行和列确定。 通过测量从点源(2)到检测器面的中子的飞行时间来计算两个检测器的中子能量。