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首页> 外文期刊>Measurement Science & Technology >Stray field ring resonators and a novel trough guide resonator for precise microwave moisture and density measurements
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Stray field ring resonators and a novel trough guide resonator for precise microwave moisture and density measurements

机译：杂散场环形谐振器和新颖的槽式导向谐振器，用于精确的微波湿度和密度测量

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摘要

The paper first describes the design and construction of two different kinds of quasi-planar stray field ring resonators for microwave moisture and density measurements, which are typical for the state of the art, and then the practical performance of such sensors. The changes in resonant frequency and resonator bandwidth are utilized for the determination of the moisture content or the material's density. Nonlinear temperature behaviour is identified as a critical property of conventional stray field resonators, which restricts their measurement accuracy. A novel trough guide resonator is then presented which is entirely manufactured from a ring of alumina oxide ceramics and overcomes the temperature problems. The ring is metallized at its surface except at the front face, which permits a stray field to come into contact with the material under test. The described resonator is capable of withstanding considerable abrasive forces without having a protective cover. At the same time it shows excellent linear and predictive temperature behaviour, which allows precise compensation of the inherent temperature dependence of the resonator. Under constant environmental conditions, the sensibility and accuracy of the old and new resonator designs are exactly the same. However, at varying temperature, an error can be removed to a much higher extent for the new resonators, restricting deviations in the moisture content caused by temperature to typically less than 0.1%, as compared to errors of up to several per cent for the previous designs over a temperature range of similar to 20 - 50 degrees C.
机译：本文首先介绍了两种不同类型的准平面杂散场环形谐振器的设计和构造，这些谐振器用于测量微波湿度和密度（这是现有技术的典型特征），然后介绍这种传感器的实际性能。利用谐振频率和谐振器带宽的变化来确定水分含量或材料的密度。非线性温度行为被认为是常规杂散场谐振器的关键特性，这限制了它们的测量精度。然后提出了一种新颖的槽形导向谐振器，它完全由氧化铝陶瓷环制成，克服了温度问题。环在除正面外的所有表面都被金属化，这允许杂散场与被测材料接触。所描述的谐振器能够在没有保护盖的情况下承受相当大的研磨力。同时，它表现出出色的线性和预测温度行为，从而可以精确补偿谐振器固有的温度依赖性。在恒定的环境条件下，新旧谐振器设计的灵敏度和准确性完全相同。但是，在温度变化的情况下，对于新的谐振器，误差可以更大程度地消除，从而将由温度引起的水分含量偏差限制在通常小于0.1％的水平，而以前的误差高达百分之几。在大约20至50摄氏度的温度范围内进行设计。

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