在分析常用快速測定方法基礎(chǔ)上從低成本快速測試的目標出發(fā)提出了實現(xiàn)土樣含水量速測用電容傳感器結(jié)構(gòu)和原理,對電容傳感器研制中存在的問題提出了解決辦法. 從使用電容傳感器測試土樣水分結(jié)果與常規(guī)烘干稱重法對比來看,其精度達到土樣含水量測定的要求.
關(guān)鍵詞:電容傳感器; 土樣; 介電常數(shù); 數(shù)學(xué)模型
Abstract : The problems of traditional testing methods are analyzed , and the capacitance sensor technique is presented for fast and cheap testing of water content in soil . The sensor designing principle and construction are also discussed. The problems have been solved in developing the capacitance sensor. The testing precision of the instrument based on
this technique is equivalent with that by the traditional drying and weighing method. The precision can meet the testing requirement of water content in a soil sample.
Key words : capacitance sensor ; soil sample ; dielectric constant ; mathematical model