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    • 5. 发明授权
    • Method for analyzing a primary neutron beam of a neutron source, a neutron source having a beam monitor, and a beam monitor
    • 用于分析中子源的初级中子束的方法,具有光束监视器的中子源和光束监视器
    • US06668033B1
    • 2003-12-23
    • US09480989
    • 2000-01-11
    • Jakob Schelten
    • Jakob Schelten
    • G01N2309
    • G01T3/06G01T3/00
    • Method for analyzing a primary neutron beam of a neutron source, a neutron source having a beam monitor, and a beam monitor. Fission chambers which are arranged in the primary neutron beam are known as beam monitors. Fission processes initiated by the neutrons produce in the fission chambers free charge carriers which, given an applied electric voltage, effect an ionization current pulse by means of which the neutron is counted. Produced as by-product during fission are undesired fast neutrons and high-energy gamma radiation. In addition, the flux of slow neutrons can be substantially attenuated by the gas filling of the fission chambers. These disadvantages can be avoided in the case of the novel method, the novel neutron source and the novel beam monitor. Neutrons are scattered incoherently out of the primary neutron beam (1) by means of a scattering foil (4). A portion of the scattered neutrons (5) strike a detector device (6) which is arranged outside the primary neutron beam (1). The beam monitor (2) can be constructed straight away such that the spatial distribution and, in the case of pulsed neutron sources, the spectral distribution of the neutrons in the primary neutron beam (1) can be determined. Analysis of a primary neutron beam of a neutron source, in particular a pulsed spallation neutron source.
    • 用于分析中子源的初级中子束的方法,具有光束监视器的中子源和光束监视器。 布置在初级中子束中的裂变室被称为束监视器。 由中子产生的裂变过程在裂变室产生自由电荷载体,在给定施加的电压的情况下,电离电流脉冲通过该电离电流脉冲计数中子。 在裂变期间作为副产物产生不希望的快中子和高能γ辐射。 此外,缓慢中子的通量可以通过裂变室的气体填充而显着减弱。 在新颖的方法,新颖的中子源和新颖的光束监测器的情况下,可以避免这些缺点。 中子通过散射箔(4)不相干散射出初级中子束(1)。 散射中子(5)的一部分撞击设置在主中子束(1)外部的检测器装置(6)。 可以直接构造光束监视器(2),使得可以确定空间分布,并且在脉冲中子源的情况下,可以确定主中子束(1)中的中子的光谱分布。 分析中子源的主中子束,特别是脉冲散射中子源。
    • 6. 发明授权
    • Sensor for measuring a magnetic field
    • 用于测量磁场的传感器
    • US06429498B1
    • 2002-08-06
    • US09763878
    • 2001-02-28
    • Jakob ScheltenRalf Lehmann
    • Jakob ScheltenRalf Lehmann
    • H01L2982
    • G01R33/06H01L43/06
    • The invention relates to a sensor for measuring a magnetic field. The inventive sensor has a high level of measuring sensitivity compared to a Hall probe, comprising several electrically semiconductive layers. The layers are arranged in the form of a power diode connected in the reverse direction, consisting of an anodelayer, a cathode layer and an intrinsically conductive layer enclosed between the two. The anode layer is subdivided by insulation sections into several anode layer areas, these areas being insulated from each other. The cathode layer has an injector area on the areas opposite the insulation sections which is oppositely doped. An electron beam is formed between the injector area and the anode by applying an injection voltage to the injector area. The electron beam is distributed across the areas of the earthed anode layer areas in the form of uniform partial currents. The electron beam is diverted by a magnetic field which forms in the intrinsically conductive layer, resulting in partial currents of different strengths on the earthed anode layer areas. The magnetic field can then be evaluated by measuring these differences in strength between the partial currents.
    • 本发明涉及一种用于测量磁场的传感器。 与霍尔探头相比,本发明的传感器具有高水平的测量灵敏度,其包括几个电半导体层。 这些层以反向连接的功率二极管的形式布置,由阳极层,阴极层和封闭在两者之间的本征导电层组成。 阳极层由绝缘部分划分为多个阳极层区域,这些区域彼此绝缘。 阴极层在与相对掺杂的绝缘部分相对的区域上具有喷射器区域。 通过向喷射器区域施加注入电压,在喷射器区域和阳极之间形成电子束。 电子束以均匀的部分电流的形式分布在接地的阳极层区域的区域上。 电子束通过在本征导电层中形成的磁场转移,导致在接地的阳极层区域上具有不同强度的部分电流。 然后可以通过测量部分电流之间的强度差来评估磁场。