【摘要】：設(shè)計(jì)了平行板電容式土壤濕度檢測(cè)裝置,提出了基于頻率特性的檢測(cè)方法。分析了平行板電容的邊緣效應(yīng);并建立了檢測(cè)電容關(guān)于介質(zhì)相對(duì)介電常數(shù)和探頭插入深度的函數(shù)關(guān)系式。以不同含水率的乙醇溶液和沙土作為介質(zhì)進(jìn)行試驗(yàn),提出理論電容公式乘以比例系數(shù)的標(biāo)定方法,標(biāo)定后的理論值與試驗(yàn)值擬合良好。研究對(duì)于設(shè)計(jì)低成本、可應(yīng)用于野外的平行板結(jié)構(gòu)的電容式土壤濕度傳感器具有良好的借鑒意義。
[Abstract]:A parallel plate capacitive measuring device for soil moisture was designed and a method based on frequency characteristics was proposed. The edge effect of parallel plate capacitance is analyzed, and the functional expression of measuring capacitance on dielectric relative dielectric constant and probe insertion depth is established. Using ethanol solution with different moisture content and sandy soil as the medium, the calibration method of theoretical capacitance formula multiplied by proportional coefficient is proposed. The theoretical value is fitted well with the experimental value after calibration. The study can be used as a reference for the design of capacitive soil moisture sensor with low cost and can be applied in the field with parallel plate structure.
【作者單位】： 太原理工大學(xué)化學(xué)化工學(xué)院;
【分類號(hào)】：S152.7
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本文編號(hào)：2230067