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測(cè)試土壤含水率和電導(dǎo)率的時(shí)域反射儀系
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of Time Domain Reflectometry for Application of Soil Moisture and Bulk Electrical Conductivity Measurements
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    研究了用于土壤參數(shù)測(cè)試的時(shí)域反射儀（TDR）系統(tǒng)原理與電路實(shí)現(xiàn)方法。根據(jù)系統(tǒng)設(shè)計(jì)要求設(shè)計(jì)出時(shí)域反射儀樣機(jī)，該樣機(jī)脈沖發(fā)生電路產(chǎn)生140ps上升沿的時(shí)域脈沖，接收電路等效采樣精度為8.69ps，并設(shè)計(jì)了時(shí)域反射儀系統(tǒng)控制程序，給出了程序的系統(tǒng)控制和數(shù)據(jù)處理流程圖。利用研制的TDR樣機(jī)對(duì)兩種土壤樣本的相對(duì)介電常數(shù)進(jìn)行了測(cè)試，反演了土壤樣品的體積含水率，同時(shí)利用采集波形反演計(jì)算出不同濕度土壤樣品的體積含水率和體積電導(dǎo)率，反演體積含水率與稱(chēng)量法測(cè)的結(jié)果接近，測(cè)試誤差均小于

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    4%。A time domain reflectometry (TDR) used in soil measurements was developed. Based on the measurement requirements of soil parameters, the TDR prototype was designed and manufactured. The pulse generator of TDR can produce a pulse with 140ps rising-edge. The equivalent sampling precision of the TDR receiver was 8.69ps. TDR control software was also programmed and the flow chart of the program was illustrated. The relative permittivities of sand and soil were measured. The volumetric moisture content and electrical conductivity (EC) of the loam and sandy loam are inversed. The inversed volumetric moisture results are close to the weighting method results. The test error is below 4%.

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馮煒,紀(jì)奕才,沈紹祥,方廣有.測(cè)試土壤含水率和電導(dǎo)率的時(shí)域反射儀系[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2009,40(5):59-63. of Time Domain Reflectometry for Application of Soil Moisture and Bulk Electrical Conductivity Measurements[J]. Transactions of the Chinese Society for Agricultural Machinery,2009,40(5):59-63.

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