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汽轮机动静叶片处的水膜、风机桨叶上的冰层等介质厚度的在线准确监测,对电力工业的安全生产具有重要的指导意义。采用微波开式同轴谐振腔作为介质厚度测量传感器,建立了介质厚度测量数学模型,根据谐振腔等效电路,推导了介质厚度的测量关系式。分别设计了用于水膜、冰层厚度测量的传感器。结果表明,随着介质厚度增加,谐振腔的谐振频率减小,衰减增大,且随着谐振腔的基准谐振频率变大,谐振腔的厚度测量分辨力提高。水膜、冰层厚度测量传感器的测量范围分别为0~1 mm、0~10 mm,测量精度较高,结构简单,易于布置,可实现在线监测。微波同轴腔在线测量介质厚度是可行的。
The accurate monitoring of the thickness of the water film at the turbine blades and vanes and the ice layer on the blades of the fan has an important guiding significance for the power industry’s safety in production. The microwave coaxial resonant cavity is used as the medium thickness measurement sensor, and the mathematical model of dielectric thickness measurement is established. Based on the resonant cavity equivalent circuit, the measurement relation of the medium thickness is deduced. Respectively, designed for water film, ice thickness measurement sensor. The results show that as the thickness of the medium increases, the resonant frequency of the resonator decreases and the attenuation increases. As the resonant frequency of the resonator increases, the resolution of the resonant cavity is improved. The measuring range of water film and ice layer thickness measuring sensor is 0 ~ 1 mm and 0 ~ 10 mm, respectively. The measurement accuracy is high, the structure is simple and easy to arrange, and the on-line monitoring can be realized. Microwave Coaxial Cavity on-line measurement of the media thickness is feasible.