郭文川,王东阳,孔繁荣,李伟强.基于介电特性的豆浆固形物含量检测[J].农业机械学报,2016,47(7):239-245.
Guo Wenchuan,Wang Dongyang,Kong Fanrong,Li Weiqiang.Solids Content Detection of Soybean Milk Based on Permittivities[J].Transactions of the Chinese Society for Agricultural Machinery,2016,47(7):239-245.
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基于介电特性的豆浆固形物含量检测   [下载全文]
Solids Content Detection of Soybean Milk Based on Permittivities   [Download Pdf][in English]
投稿时间:2016-01-30  
DOI:10.6041/j.issn.1000-1298.2016.07.033
中文关键词:  豆浆  固形物含量  频率  温度  介电参数
基金项目:国家自然科学基金项目(31171720)
作者单位
郭文川 西北农林科技大学 
王东阳 西北农林科技大学 
孔繁荣 西北农林科技大学 
李伟强 西北农林科技大学 
中文摘要:为检测豆浆中固形物含量(S),采用网络分析仪研究了频率(20~4500MHz)、温度(20~80℃)和S(200~〖JP〗7.01g/(100mL))对豆浆介电参数(相对介电常数ε′和介质损耗因子ε″)的影响规律;建立了豆浆介电参数与温度、S之间的关系模型,并对模型预测S的可行性进行了检验。结果说明,在20~4500MHz的频率范围内,ε′随频率的增大而减小,ε″随频率的增大先减小后增大,在600~2000MHz之间有最小值。ε′随温度的升高而减小,低频段下ε″随温度的升高而增大,而高频段下ε″随温度的升高而减小,ε″达到最小值时的频率随着温度的升高而增大。ε′随S的增大而减小,而ε″随S的增大而增大。一定频率下,可用二次多项式表达豆浆的ε′和ε″与温度、S的关系;基于100MHz下的ε′和20MHz下的ε″〖KG*4〗所建立的二次多项式的决定系数分别为0.989和0.990。对模型的验证结果表明,基于20MHz下的ε″计算的S值与实测值之间的决定系数为0.978。研究结果表明介电特性可用于检测豆浆中的固形物含量。
Guo Wenchuan  Wang Dongyang  Kong Fanrong  Li Weiqiang
Northwest A&F University,Northwest A&F University,Northwest A&F University and Northwest A&F University
Key Words:soybean milk  solid content  frequency  temperature  permittivities
Abstract:To explore a method for detecting solids content of soybean milk, network analyzer and open ended coaxial line probe were applied to study the influence of frequency (20~4500MHz), temperature (20~80℃) and solid content (2.00~7.01g/(100mL)) on dielectric parameters (relative dielectric constant ε′ and dielectric loss factor ε″) of soybean milk. The models describing the permittivities as functions of temperature and solid content were built, and its feasibility to predict solid content using obtained permittivities were verified. The results showed that over the frequency range of 20~4500MHz, ε′ was decreased with an increase of frequency, and ε″ was increased after decrease with increasing frequency. The minimum ε″ was observed at 600~2000MHz. ε′ was decreased with an increase of temperature, and ε″ was increased with increasing temperature at low frequency end and decreased at high frequency end. The frequency where minimum ε″ was increased with increasing temperature. ε′ was decreased but ε″ was increased with increasing solid content. At a given frequency, quadratic polynomial could be used to describe the relationship among permittivities (ε′ and ε″) and temperature and solid content. The determination coefficient of the built model was 0.989 for ε′ (100MHz) and 0.990 for ε″ (20MHz). The model verification results showed that the determination coefficient was 0.978 between the calculated solid content using obtained ε″ at 20MHz and the measured ones. This study indicated that permittivities could be used to detect the solid contents of soybean milk.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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