Issues in measuring the full-liquid level interface using guided-wave radar
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Dear teachers, a guided-wave radar is to be installed on-site to measure the liquid level interface, and there are a few questions I’m not sure about. 1. As the electromagnetic wave travels along the guided-wave rod, what is its propagation speed: the speed of the electromagnetic wave within the guided-wave rod, or the speed of the electromagnetic wave in medium 1? 2. Why does the measured distance change when the temperature of the material inside the measuring cylinder rises?
1. In guided-wave radar, electromagnetic waves propagate along the guided wave rod; an interface is formed between the guided wave rod and medium 1, and the propagation speed depends on the propagation speeds of the electromagnetic waves in these two media. 2. When the temperature of the material inside the measuring cylinder rises, the measured distance changes because the refractive index of the medium is affected by temperature. The higher the refractive index, the slower the propagation speed of electromagnetic waves, which results in an increased measured distance. Therefore, as the temperature of the material rises, the refractive index of the medium increases, resulting in an increase in the measured distance as well. .