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Low-Cost Electronic Microwave Calibration for Rapid On-Line Moisture Sensing of Seedcotton

机译:低成本电子微波校准技术可快速实现棉籽棉的在线水分感测

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In order to improve rapid on-line moisture sensing of seedcotton in cotton gins, a means by which to establish a reliable low-cost wide-band electronic calibration is critically needed. This calibration is needed to center the circuit due to changes in the internal signal delays and attenuation drift caused by temperature changes in the various system components and circuit elements. This research examines a hardware technique for use in conjunction with microwave reflective sensing probes having an extended bandwidth from 500 MHz through 2.5 GHz. This new technique was validated experimentally against known electrical propagation delay standards. Results of the measured propagation delay with this type of automatic electronic calibration method was found to agree with results using a vector network analyzer with a traditional S11 single port error correction calibration methodology to within 4% of the measurement, 95% confidence, with a standard error of +/− 18.6 ps for the delay measurements. At this level of performance, the proposed low-cost technique exhibits superior performance, over the typical geosciences time-domain reflectometer “TDR”, instruments in common use in soil moisture testing and is suitable for use in cotton gin moisture sensing.
机译:为了改善轧花机中棉籽棉的在线快速湿度检测,迫切需要一种建立可靠的低成本宽带电子校准的方法。由于内部信号延迟的变化以及各种系统组件和电路元件中温度变化引起的衰减漂移,需要进行此校准以使电路居中。这项研究研究了一种硬件技术,该技术可与带宽从500 MHz扩展到2.5 GHz的微波反射传感探头配合使用。这项新技术已针对已知的电传播延迟标准进行了实验验证。发现使用这种类型的自动电子校准方法测得的传播延迟结果与使用传统S11单端口纠错校准方法的矢量网络分析仪的结果相符,测量结果在4%以内,置信度为95%(标准)延迟测量的误差为+/- 18.6 ps。在这种性能水平上,与典型的地球科学时域反射仪“ TDR”相比,拟议的低成本技术表现出优越的性能,后者是土壤湿度测试中常用的仪器,并且适用于棉轧花​​湿度检测。

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