韩文霆,乔军,许景辉.T-TDR传感器土壤热场模拟与测温结点位置研究[J].农业机械学报,2013,44(8):106-111.
Han Wenting,Qiao Jun,Xu Jinghui.Soil Thermal Field Simulation and Temperature Node Positions Research of T-TDR Sensors[J].Transactions of the Chinese Society for Agricultural Machinery,2013,44(8):106-111.
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T-TDR传感器土壤热场模拟与测温结点位置研究   [下载全文]
Soil Thermal Field Simulation and Temperature Node Positions Research of T-TDR Sensors   [Download Pdf][in English]
  
DOI:10.6041/j.issn.1000-1298.2013.08.019
中文关键词:  T-TDR传感器  土壤热传导  热场模拟  土壤温度  土壤水分
基金项目:“十二五”国家科技支撑计划资助项目(2011BAD29B08)、高等学校学科创新引智计划“111”资助项目 (B12007)和中央高校基本科研业务费专项资金资助项目(2109021117、QN2011128)
作者单位
韩文霆 西北农林科技大学 
乔军 西北农林科技大学 
许景辉 西北农林科技大学 
中文摘要:通过研究T-TDR传感器的热传导过程,优化热电偶结点的嵌入位置,提高了传感器测量精度。采用土壤二维热传导方程,利用Heat Transfer数值计算模型,在分析T-TDR探针传热初边值问题的基础上,探讨了T-TDR传感器热场随时间、土壤热传导率、土壤热容等参数变化的关系,模拟了传感器在不同外界环境温度、导热系数和容积热容量土壤中的热传导动态过程和热场空间分布。结果表明,T-TDR传感器中热电偶结点的最优嵌入位置为传感器末端方向上距离探针中点2 mm处,此位置对于中间探针的辐射热量最为敏感。
Han Wenting  Qiao Jun  Xu Jinghui
Northwest A&F University;Northwest A&F University;Northwest A&F University
Key Words:T-TDR sensor  Soil thermal conduction  Thermal field simulation  Soil temperature  Soil moisture
Abstract:The measurement accuracy of T-TDR sensor was improved via studying the heat conduction process and optimizing the embedded point of the thermocouple nodes. Using 2-D heat transfer equation in the soil, the initial boundary value of the Heat Transfer of the T-TDR probe was analyzed numerically. Then the relationship between the thermal field of T-TDR with time, thermal conductivity and capacity of soil was established. Furthermore, the dynamic process of heat transfer and spatial thermal distribution of T-TDR at different environment temperature, conductivity and volumetric heat capacity were simulated. The results showed that the optimal positions of the thermocouple node on both sides were on the probe midpoint at 2 mm thermocouple junction of the sensor terminal direction distance. This was the most sensitive point to the radiant heat of the intermediate probe. 

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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