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喬木莖體水分傳感器探針結(jié)構(gòu)實驗
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    摘要:

    基于駐波率測量原理的喬木莖體水分傳感器，其測量裝置由信號源、同軸傳輸線及雙針平行不銹鋼探針組成。喬木莖體的介電特性決定了同軸傳輸線兩端電壓差值(即傳感器的輸出電壓)的大小，通過測量傳感器的輸出電壓，可達到測量喬木莖體體積含水率的目的。通過兩個實驗來確定傳感器的探針結(jié)構(gòu)：模擬實驗中研究了在不同有機試劑中探針長度對傳感器輸 出電壓的影響，實驗中選取了不同的有機試劑來模擬不同體積含水率的喬木莖體。根據(jù)模擬實驗數(shù)據(jù)，得出了傳感器輸出電壓與探針長度的單調(diào)變化關(guān)系，選取了傳感器的探針結(jié)構(gòu)參數(shù)；對側(cè)柏喬木莖體樣本進行了干燥實驗，得出傳感器的輸出電壓與樣本的體積含水率之間有較好的線性關(guān)系。

    Abstract:

    A probe based on standing wave ratio (SWR) to measure stem water content was presented. Two experiments were taken to study the configuration of probe: (1) Simulation experiment. Different organic solutions were chosen as the testing media to simulate the stem which contains water. The result shows that the output voltage changed lineally with the length change of the probe. (2) Calibration experiment. The sample of arborvitae was selected and the oven temperature was kept at 60℃ constantly. The result shows that the relationship between water content of stem and the output voltage was linear. It can be concluded that the probe we studied could be used to measure stem water content. 

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王海蘭,白陳祥,趙燕東.喬木莖體水分傳感器探針結(jié)構(gòu)實驗[J].農(nóng)業(yè)機械學(xué)報,2009,40(1):176-179.[J]. Transactions of the Chinese Society for Agricultural Machinery,2009,40(1):176-179.

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