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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 using electric parameters to identify damaged jujube, the electrical parameters of Lingwu longjudao and control normal jujube were dynamically measured by LCR meter. The changes of its regular curve Fitting and correlation analysis; using t test for statistical analysis of the correlation coefficient of the fitted curve to screen out the sensitive electrical parameters and the better test frequency segment; using paired data sample t-test [t (α = 0.05), P <0.05)] The difference of the sensitive electrical parameters in the selected frequency band was significantly analyzed, and the characteristic frequency points were screened out. The results show that jujube fruits with different degrees of damage can be distinguished by Cp value of parallel equivalent capacitance at 12 characteristic frequency points in the frequency range from 251.1 kHz to 1 MHz. Nine eigenfrequencies in the 281.8-707.9 kHz band Point, you can use the susceptance B value at the same time distinguish between the different levels of damage jujube. Jujube damage identification based on electrical characteristics is feasible.