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公开(公告)号：US4211970A
公开(公告)日：1980-07-08
申请号：US910557
申请日：1978-05-30
摘要： The water content of electrically non-conductive powders, granulates, pastes and fibrous materials may be measured on the basis of microwave absorption. A frequency-modulated microwave oscillator supplies a closed multimode measuring resonator charged with the sample in a transmission arrangement. The sample charged into a container almost completely fills the multimode resonator. The sample container is rotatable about its longitudinal axis. A substantial homogeneity of the field distribution in the sample is thus obtained so that even in the case of variations in the bulk density, accurate measurements are still possible.
摘要翻译： 非导电粉末，颗粒，糊剂和纤维材料的含水量可以基于微波吸收来测量。 调频微波振荡器以传输装置提供带有样品的闭合多模测量谐振器。 充入容器中的样品几乎完全填充多模谐振器。 样品容器可围绕其纵向轴线旋转。 因此，获得样品中的场分布的实质均匀性，使得即使在体积密度的变化的情况下，仍然可以进行精确的测量。
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公开(公告)号：US4270083A
公开(公告)日：1981-05-26
申请号：US90372
申请日：1979-11-01
摘要： The generator for the microwave measuring arrangement consists of a frequency-modulated oscillator which feeds a cavity measuring resonator in a transmission arrangement. The sample to be examined is located in the center of the resonator. The microwave signal allowed through the resonator is detected as the peak amplitude of a detector circuit, the change in the signal corresponding to the change in the quality factor due to the presence of the sample introduced. The average frequency of the microwave oscillator can be switched over several stages in order to expand the range of measurement. Each time the frequency is switched over, a different field mode is excited in the measuring resonator so that the sample is located in a mode region of the electrical measuring field for measuring high water contents and in a maximum of the electrical measuring field for measuring low water contents.
摘要翻译： 用于微波测量装置的发生器由调频振荡器组成，该调频振荡器以传输装置馈送空腔测量谐振器。 要检查的样品位于谐振器的中心。 通过谐振器允许的微波信号被检测为检测器电路的峰值振幅，由于引入的样本的存在，与质量因子的变化相对应的信号的变化。 微波振荡器的平均频率可以在几个阶段进行切换，以扩大测量范围。 每次频率切换时，在测量谐振器中激励不同的场模式，使得样本位于用于测量高含水量的电测量场的模式区域中，并且在用于测量低的电测量场的最大值 含水量。
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3.发明授权Apparatus for determining the water content of isotropic materials by means of microwave absorption 失效通过微波吸收法测定各向同性材料的含水量的装置
公开(公告)号：US4206399A
公开(公告)日：1980-06-03
申请号：US890764
申请日：1978-03-27
CPC分类号： G01N22/04
摘要： The principle of measurement is based on the microwave absorption by the water content of a sample. The sample is located in a closed single-reflection measurement cell which is fed by a microwave oscillator which is frequency-modulated within the absorbing frequency range of the sample. The sample partially or completely fills the end section of a circular or rectangular waveguide forming the measurement cell. The waveguide is sealed off with a short circuit plate so that two planar travelling waves with a homogeneous field distribution are present in the measurement cell.
摘要翻译： 测量的原理是基于微波对样品含水量的吸收。 样品位于封闭的单反射测量单元中，该单元由在样品的吸收频率范围内被调频的微波振荡器馈送。 样品部分或完全填充形成测量单元的圆形或矩形波导的端部。 波导用短路板密封，使得具有均匀场分布的两个平面行波存在于测量单元中。
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4.发明授权Apparatus for determining the water content of isotropic materials by means of microwave absorption 失效通过微波吸收法测定各向同性材料的含水量的装置
公开(公告)号：US4203067A
公开(公告)日：1980-05-13
申请号：US886693
申请日：1978-03-15
CPC分类号： G01N22/04
摘要： The measuring arrangement consists of a frequency-modulated microwave oscillator which supplies a closed resonator charged with the sample in a transmission circuit. The change in the quality factor induced by the water content of the sample is used as the unknown. The sample is located in the substantially homogeneous range of the electrical field maximum of a stationary wave in a cylindrical single mode cavity resonator of the E.sub.010 mode, the diameter of the sample being not more than 25% of the internall diameter of the resonator and the length of the sample being not more than 50% of the height of the resonator.
摘要翻译： 测量装置由调频微波振荡器组成，该调制微波振荡器在传输电路中提供带有样品的封闭谐振器。 将样品含水量引起的质量因子的变化用作未知数。 样品位于E010模式的圆柱形单模空腔谐振器中的固定波的电场最大值的基本均匀的范围内，样品的直径不大于谐振器的内径直径的25％ 样品的长度不超过谐振器高度的50％。
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