便携式猪肉阻抗谱检测系统研制  

Development of portable bio-impedance spectroscopy system for measuring porcine meat quality

作　　者：丁强[1] 王忠义[1] 黄岚[1] 何建昕[1] 张根伟[1] 高健[1] 万青[2] 

机构地区：[1]中国农业大学信息与电气工程学院,北京100083 [2]中国农业大学水利与土木工程学院,北京100083

出　　处：《农业工程学报》2009年第12期138-144,共7页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家863项目(2007AA10Z212)

摘　　要：基于生物阻抗谱检测原理,设计并实现了一个非破坏性的便携式肉品阻抗谱检测系统,主要包括信号发生单元和检测单元,信号源能够在0.1～250kHz范围内自动扫频,检测单元由检测电极和增益、相位检测器构成。探讨了检测电极设计方案,比较分析了六钢针电极和四针石墨电极的性能,同时通过试验证明了系统的稳定性,1 kHz以上系统的变异系数CV<6%;以组内相关系数ICC来评定在不同温度下系统的可靠性,系统模型中Ri、Re、C的ICC均大于65%,系统稳定可靠。选取猪肉样品进行了新鲜度指标与阻抗谱关系的初步研究,结果表明随着猪肉新鲜程度改变,猪肉复阻抗值、复阻抗实部值、复阻抗虚部值以及特征频率都表现出减小的趋势。Based on the principle of bio-impedance spectroscopy,a non-destructive portable bio-impedance prototype system for measuring meat quality was developed.The system consisted of a signal generator unit and a detection unit. The former unit could output sinusoidal signal with automatic frequencies scanning,which is range from 0.1 kHz to 250 kHz.The detection unit included detection electrodes and a gain and phase detector.In this work,the performance of six-needle steel electrodes and four-needle graphite electrodes in detecting bio-impedance was compared.Also, coefficients of variability（CVs）were applied to assess the stability of the system.Experiment showed that the coefficient of variation（CV）of the system was less than 6%if the frequency was above 1 kHz.Intra class correlation （ICC）procedures were applied to assess the reliability of the system due to temperature variability.Values of Ri,Re,C in the system model were reliable with intra class correlations of more than 65%.Furthermore,pork samples were selected to investigate relation between bio-impedance spectroscopy and meat quality attributes,i.e.meat freshness.Results showed that bio-impendence value,real part value of bio-impendence,imaginary part value of bio-impendence and characteristics frequency of pork decreased with the change of meat freshness.

关 键 词：电极 肉品 检测 阻抗谱 肉品新鲜度 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TP216[自动化与计算机技术—控制科学与工程]