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94 条记录 (耗时 0.017 秒)

    Broadband electromagnetic absorption via a collisional helium plasma
    92.
    发明授权
    Broadband electromagnetic absorption via a collisional helium plasma 失效
    通过碰撞氦等离子体进行宽带电磁吸收

    公开(公告)号：US5594446A

    公开(公告)日：1997-01-14

    申请号：US149574

    申请日：1988-01-28

    申请人： Robert J. Vidmar ,  Donald J. Eckstrom ,  Joseph J. Eash ,  Walter G. Chestnut

    发明人： Robert J. Vidmar ,  Donald J. Eckstrom ,  Joseph J. Eash ,  Walter G. Chestnut

    IPC分类号： H01Q1/36 ,  H01Q17/00

    CPC分类号： H01Q17/00 ,  H01Q1/366

    摘要： A system (20) for broadband electromagnetic absorption in an anechoic chamber (22) has walls (24) of the chamber (22) forming a sealed space. A plurality of ionization sources (30) are mounted on an inside surface of the walls (24), facing the sealed space (28), with a spacing to give one ionization source/m.sup.2 of chamber (22) surface. An electron beam source (32) is connected to the ionization sources (30). A source (36) of helium gas is connected to supply the helium to the space (28). An electronic unit (42) under test is inside the anechoic chamber, and is connected to a test system (44). The test system (44) is also connected to the electron beam source (32). The ionization sources (30) generate a helium plasma in the space (28) by pulsed operation of the electron beam source (32). Timing signals are supplied by the synchronizer (52) to electron-beam source (32) and to the test system (44), so that test signals are supplied by the test system (44) to the unit (42) under test and outputs from the unit (42) are supplied to the test system (44) during an approximately 200 .mu.second low-noise portion of the helium plasma afterglow following energization of the ionization sources (30). Electromagnetic waves generated by the unit (42) in the chamber (22) during the test are absorbed by the helium plasma, so that the outputs from the unit (42) do not include any substantial interference from reflected electromagnetic waves in the chamber (22).

    摘要翻译： 在电波暗室（22）中用于宽带电磁吸收的系统（20）具有形成密封空间的腔室（22）的壁（24）。 多个电离源（30）安装在壁（24）的面向密封空间（28）的内表面上，间隔以形成一个电离源/ m2的室（22）表面。 电子束源（32）连接到电离源（30）。 氦气源（36）被连接以将氦气供应到空间（28）。 被测电子单元（42）在消声室内，并连接到测试系统（44）。 测试系统（44）也连接到电子束源（32）。 电离源（30）通过电子束源（32）的脉冲操作在空间（28）中产生氦等离子体。 定时信号由同步器（52）提供给电子束源（32）和测试系统（44），使得测试信号由测试系统（44）提供给被测单元（42），输出 在电离源（30）通电之后的氦等离子体余辉的大约200μ秒的第二低噪声部分期间，从单元（42）被提供给测试系统（44）。 在测试期间由腔室（22）中的单元（42）产生的电磁波被氦等离子体吸收，使得来自单元（42）的输出不包括来自室（22）中的反射电磁波的任何实质干扰 ）。

    Method and apparatus for altering a region in the earth's atmosphere, ionosphere, and/or magnetosphere
    93.
    发明授权
    Method and apparatus for altering a region in the earth's atmosphere, ionosphere, and/or magnetosphere 失效
    用于改变地球大气，电离层和/或磁层中的区域的方法和装置

    公开(公告)号：US4686605A

    公开(公告)日：1987-08-11

    申请号：US690333

    申请日：1985-01-10

    申请人： Bernard J. Eastlund

    发明人： Bernard J. Eastlund

    IPC分类号： F41G7/22 ,  F41H13/00 ,  H01Q1/36 ,  H05H1/18 ,  H05B6/64 ,  H05C3/00 ,  H05H1/46

    CPC分类号： F41H13/0043 ,  F41G7/224 ,  H01Q1/366 ,  H05H1/18

    摘要： A method and apparatus for altering at least one selected region which normally exists above the earth's surface. The region is excited by electron cyclotron resonance heating to thereby increase its charged particle density. In one embodiment, circularly polarized electromagnetic radiation is transmitted upward in a direction substantially parallel to and along a field line which extends through the region of plasma to be altered. The radiation is transmitted at a frequency which excites electron cyclotron resonance to heat and accelerate the charged particles. This increase in energy can cause ionization of neutral particles which are then absorbed as part of the region thereby increasing the charged particle density of the region.

    摘要翻译： 用于改变通常存在于地球表面之上的至少一个选定区域的方法和装置。 该区域被电子回旋共振加热激发，从而增加其带电粒子密度。 在一个实施例中，圆极化电磁辐射在基本上平行于并且沿着延伸通过待改变的等离子体区域的场线的方向上传输。 辐射以激发电子回旋共振的频率传播以加热并加速带电粒子。 这种能量的增加会导致中性粒子的离子化，然后中和粒子的电离被吸收，从而增加该区域的带电粒子密度。