高阶模态对基于导波雷达的液位传感器响应的证据和影响

2015 International Semiconductor Conference (CAS) Pub Date : 2015-10-01 DOI:10.1109/SMICND.2015.7355186

C. Cobianu, I. Georgescu, Michael Hughes, Stuart Heath, F. Haran

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引用次数: 1

摘要

在本工作中，我们研究了脉冲持续时间和坦克的几何形状对导波雷达(GWR)电平发射机的时间响应的影响。通过1COMSOL®建模和仿真，我们发现对于小于0.5ns的短脉冲和较大直径的喷嘴(大于150 mm)，会产生寄生的高阶模式，如TE11，从而影响液位测量的精度。这种TE11模式干扰TEM模式，产生驻波，在时域响应中表现为“振铃”。脉冲持续时间为0.27 ns，喷嘴直径为152 mm时的实验结果与模型吻合良好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Evidence and effects of higher order modes on the response of guided wave radar-based level sensors

In this work we investigate the effects of the pulse duration and geometry of the tank on the time response of the guided wave radar (GWR) level transmitter. By 1COMSOL® modelling and simulation we show that for shorter pulses below 0.5ns and larger diameters of the nozzle (above 150 mm) parasitic higher order modes, like TE11 are generated, affecting the accuracy of level measurement. This TE11 mode interferes with TEM mode creating standing waves evidenced as “ringing” in the time domain response. The experimental results shown here for pulse duration of 0.27 ns and a diameter of the nozzle of 152 mm are in very good agreement with the model.

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2015 International Semiconductor Conference (CAS)

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