一种基于温度补偿的便携式土壤水分传感器

J. Sensors Pub Date : 2022-08-12 DOI:10.1155/2022/1061569
H. Tian, Chongchong Yu, Tao Xie, Tong Zheng, Mei Sun
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引用次数: 0

摘要

基于驻波率原理的土壤水分传感器在长期工作中受到温度的影响。针对这一问题,提出了一种基于二元回归分析方法的温度补偿模型。分析了温度补偿驻波率(TCSWR)传感器在不同温度和土壤体积含水量下的测量结果,利用最小二乘原理确定了驻波率传感器温度补偿模型中需要确定的参数。在此基础上研制了一种内置温度补偿模型的便携式锥形TCSWR传感器。标定结果表明,TCSWR传感器驻波测量电路能有效响应土壤水分的变化,拟合方程的系数超过0.95。温度补偿前后的结果对比表明,补偿可以显著降低TCSWR传感器的测量误差,提高测量精度。TCSWR传感器的静态和动态特性表明,TCSWR传感器的测量范围为7.50% ~ 31.50%,测量精度为±0.63%,稳定性好,分辨率最低为0.05%,动态响应时间小于1 s。与同类传感器相比,TCSWR传感器测量的绝对误差小于1%,表明TCSWR传感器测量结果可靠。
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A Novel Portable Soil Water Sensor Based on Temperature Compensation
Soil water sensors based on the standing wave rate (SWR) principle are affected by temperature in long-term operation. To address this problem, a temperature compensation model based on the binary regression analysis method is proposed. The measurement results of the temperature-compensated standing wave rate (TCSWR) sensor at different temperatures and soil volumetric water content are analyzed, and the least-squares principle is used to identify the parameters to be determined in the compensation model for temperature for the SWR soil water sensor. A portable tapered TCSWR sensor with built-in temperature compensation model was developed on this basis. The calibration results show that the standing wave measurement circuit of the TCSWR sensor can effectively respond to changes in soil water, and the coefficient of the fitted equation exceeds 0.95. A comparison of the results before and after temperature compensation proves that compensation can significantly reduce the measurement error of the TCSWR sensor and improve the measurement accuracy. The static and dynamic characteristics of the TCSWR sensor show that the measurement range of the TCSWR sensor is7.50%-31.50%, the measurement accuracy is ±0.63%, the stability is good, the resolution is a minimum of 0.05%, and the dynamic response time is less than 1 s. The absolute error of the TCSWR sensor measurement is less than 1% in comparison with similar sensors, demonstrating that the measurement results of the TCSWR sensor are reliable.
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