损伤对灵武长枣电参数的影响

Influence of damages on electrical parameter values of Lingwu long-jujube

为了探求以电参数识别损伤枣果的可行性,利用LCR测量仪,动态测定了不同损伤程度(撞击、静压损伤)灵武长枣及对照正常枣果的电参数;对其变化规律曲线进行拟合和相关性分析;用t检验法对拟合曲线的相关系数进行统计学分析,从而筛选出敏感电参数及其较佳的测试频率段;用配对资料两样本均数比较的t检验法[t(α=0.05),P<0.05)]对选定频率段内的敏感电参数进行差异显著性分析,筛选出特征频率点。结果表明:在251.1 kHz^1 MHz频率段内的12个特征频率点下,可以用并联等效电容Cp值区分出不同损伤程度的枣果;在281.8~707.9 kHz频率段内的9个特征频率点下,可以用电纳B值同时区分出不同损伤程度的枣果。基于电特性的枣果损伤识别是可行的。

In order to explore the feasibility of damage identification based on fruit electricity properties, the electrical parameters of Lingwu long date with different damage （impact, static pressure injury） degrees and normal jujube were tested dynamically using the LCR meter. The fitting and correlation analysis of the change rule curves were conducted. The correlation coefficients of the fitted curves were analyzed statistically with t test; thereby the sensitive electric parameters and their better test frequency were selected. The significant differences of sensitive electrical parameters within selected frequency were analyzed using t test [t（alpha=0.05）, P〈0.05）] with the matching information comparison of two sample means; thereby the characteristic frequency points were selected. Results show that jujube fruit of different damage degrees can be distinguished by parallel equivalent capacitance Cp at 12 characteristic frequency points within 251.1 kHz to 1 MHz frequency, and by electrical susceptance B at 9 characteristic frequency points within 281.8 kHz to 707.9 kHz frequency. Electrical characteristics based jujube fruit damage identification is feasible.