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基于介電特性的小雜糧含水率檢測(cè)儀設(shè)計(jì)與試驗(yàn)
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國(guó)家自然科學(xué)基金資助項(xiàng)目（31171720）;中央高?；究蒲袠I(yè)務(wù)費(fèi)專項(xiàng)資金資助項(xiàng)目（ZD2012017）


Moisture Meter for Coarse Cereals Based on Dielectric Properties
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    摘要:

    以直流充/放電電路、溫度傳感器DS18B20和等臂電橋電路分別檢測(cè)小雜糧的電容、溫度和容積密度；以C51為程序開發(fā)語(yǔ)言，設(shè)計(jì)了一種基于介電特性的小雜糧含水率檢測(cè)儀。以小米為對(duì)象，應(yīng)用自制儀器研究了含水率、溫度和容積密度對(duì)電容的影響規(guī)律；建立了描述電容與含水率、溫度關(guān)系的數(shù)學(xué)模型；并對(duì)模型的可靠性進(jìn)行了驗(yàn)證。檢驗(yàn)了所設(shè)計(jì)的小雜糧檢測(cè)儀在基于電容和溫度預(yù)測(cè)小米含水率方面的可行性。結(jié)果表明，在濕基含水率11%~19％、溫度5~40℃的范圍內(nèi)，該檢測(cè)儀的測(cè)量精度為±0.5%，響應(yīng)時(shí)間小于3s。

    Abstract:

    In order to offer a portable, quick and precise method and instrument for measuring moisture content of coarse cereals, a moisture meter was designed based on dielectric properties and C51 language. DC charge/discharge circuit, digital temperature sensor DS18B20 and equal-arm bridge circuit were used to detect the values of capacitance, temperature and bulk density of coarse cereals. Millet was used as sample to study the influence of moisture content, temperature and bulk density on capacitance with the self-made moisture meter. Mathematical model, describing their relationship, was regressed and verified. The accuracy in predicting moisture content from obtained capacitance and temperature was tested. The results showed that the measurement precision for moisture content was ±0.5% and the response time was less than 3s when the moisture content in wet basis was within 11%~19% and in temperature of 5~40℃.

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郭文川,趙志翔,楊沉陳.基于介電特性的小雜糧含水率檢測(cè)儀設(shè)計(jì)與試驗(yàn)[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2013,44(5):188-193. Guo Wenchuan, Zhao Zhixiang, Yang Chenchen. Moisture Meter for Coarse Cereals Based on Dielectric Properties[J]. Transactions of the Chinese Society for Agricultural Machinery,2013,44(5):188-193.

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  • 在線發(fā)布日期: 2013-04-28
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