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基于介電特性的薏米含水率檢測方法
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國家自然科學基金資助項目(31171720);中央高?；究蒲袠I(yè)務費專項資金資助項目(西北農(nóng)林科技大學QN2009043)


Predicating Moisture Content of Pearl Barley Based on Dielectric Properties
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    摘要:

    研究了測量信號頻率(1~1000kHz),、溫度(5~40℃)和含水率(14.7%~22.7%)對薏米相對介電常數(shù)的影響，分析了影響相對介電常數(shù)變化的原因,，建立了100kHz下基于相對介電常數(shù)和樣品溫度預測薏米含水率的數(shù)學模型,，并對模型進行了驗證。研究結果表明,，在1~1000kHz頻段內,，薏米的相對介電常數(shù)隨著樣品含水率和溫度的升高而增大，卻隨著信號頻率的增大單調減??；頻率一定時，可用三次多項式表示含水率與相對介電常數(shù)和溫度的關系,；100kHz下模型的決定系數(shù)是0.9976,，實測薏米含水率與預測含水率的決定系數(shù)為0.9977。

    Abstract:

    Pearl barley was used to study the influence of frequency (1~1000kHz), temperature (5~40℃) and moisture content (14.7%~22.7%) on the relative dielectric constant. The reasons for dielectric constant changed with these factors were analyzed. Furthermore, the mathematical model for predicating moisture content of pearl barley based on the dielectric constant and temperature at 100kHz was established, and the model was verified. The results indicated that the dielectric constant of pearl barley increased as moisture content and temperature increasing, decreased with frequency increasing over the frequency range from 1~1000kHz. The relationship between the dielectric constant, temperature and moisture content can be described by cubic polynomial, with the coefficient of determination of 0.9976 at 100kHz. Obvious linear relationship was observed between measured moisture contents and calculated moisture contents, with coefficient of determination of 0.9977.

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郭文川,王婧,劉馳.基于介電特性的薏米含水率檢測方法[J].農(nóng)業(yè)機械學報,2012,43(3):113-117. Guo Wenchuan, Wang Jing, Liu Chi. Predicating Moisture Content of Pearl Barley Based on Dielectric Properties[J]. Transactions of the Chinese Society for Agricultural Machinery,2012,43(3):113-117.

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  • 在線發(fā)布日期: 2012-03-17
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