An electromagnetic coupled-cavity resonator equipped with permanent insertion holes and designed to sense continuous dielectric material streams through the resonator is presented. The resonating structure comprises a pair of pill-box-shaped cylindrical cavities mutually coupled to each other through an aperture-loaded metal sheet of finite thickness. The input and output insertion holes in the top and bottom lids of the cavity structure form a channel for the flow of dielectric samples under test. The arrangement of aperture-coupled cavity sections results in antisymmetric and symmetric field distributions with split resonances. The resonating antisymmetric field is primarily utilized to detect dielectric load variations of the sample stream, similar to the commonly practiced permittivity based measurements in TM ₀₁₀ cavities. The additional resonance mode with the symmetric field distribution is more sensitive to position offsets of the sample in its concentric flow along the axis. Due to the added resonance, the arrangement provides for 2-D sensing of dielectric specimens under test (dielectric load variation and position offset) and improved accuracy can, thus, be achieved. The working principle of the coupled-cavity technique is analyzed qualitatively by numerical computations. The technique is validated by measuring samples of commercially available cotton fibers with a realized prototype.

中文翻译：

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耦合腔谐振器技术，可同时感测介电载荷和连续物料流的位置

提出了一种电磁耦合腔谐振器，该谐振器配备有永久性的插入孔，并设计为感测通过谐振器的连续介电材料流。该谐振结构包括一对药盒形的圆柱形空腔，它们通过有限厚度的装有孔的金属板相互连接。腔体结构的顶盖和底盖中的输入和输出插入孔形成用于测试电介质样品流动的通道。孔耦合腔部分的布置导致具有分裂共振的反对称和对称场分布。共振反对称场主要用于检测样品流的介电负载变化，类似于TM _010中基于电容率的常用测量方法 蛀牙。具有对称场分布的附加共振模式对样品在沿轴的同心流中的位置偏移更加敏感。由于增加的共振，该布置提供了对被测介电样品的二维感测（介电负载变化和位置偏移），因此可以实现更高的精度。通过数值计算对定腔技术的工作原理进行了定性分析。通过使用已实现的原型测量可商购的棉纤维样品来验证该技术。