| 摘要: |
| 【目的】用非破坏性手段提取新鲜鸭蛋与咸蛋的特征介电参数，为实现咸蛋腌制进度的动态、无损检测提供参考。【方法】以新鲜鸭蛋和市售咸蛋为材料，用电子天平、游标卡尺测定对比二者在质量、蛋形指数、蛋黄指数等方面的差异；用日置智能3532-50型LCR数字测试仪在测试频段（500～5 000 000 Hz）内以对数形式取41个频率点，测定并绘制新鲜鸭蛋和咸蛋的介电参数与测试频率的关系曲线，通过介电参数与频率的相关分析，筛选可以区分二者的特征介电参数。【结果】新鲜鸭蛋和市售咸蛋的介电参数均与测试频率显著相关（P<0.05），新鲜鸭蛋和市售咸蛋的相对介电常数ε′r在500～5 000 000 Hz测试频段内有极显著差异（P<0.01）；二者的损耗因子D的相对误差较大，复阻抗Z无显著差异。【结论】相对介电常数ε′r可以作为区分新鲜鸭蛋和市售咸蛋的特征介电参数，其最适测试频率为200 000～2 000 000 Hz。 |
| 关键词: 咸蛋 介电特性 特征介电参数 无损检测 |
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| 基金项目:国家自然科学基金项目（30471001）；国家自然科学基金青年科学基金项目（31201122） |
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| Characteristic dielectric parameters of fresh and salted duck eggs |
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| Abstract: |
| 【Objective】The study was to extract characteristic dielectric parameters of fresh and salted duck eggs to improve the monitor of duck eggs salting process.【Method】Using fresh and salted duck eggs as test materials,their differences in egg weights (weighed by electronic balance),egg shape indexes (measured by caliper),egg yolk indexes (measured by caliper) and dielectric parameters (measured by HIOKI 3532-50 LCR HiTESTER) were analyzed comparatively.Within the entire test frequency range (500-5 000 000 Hz),41 frequency points in logarithmic form were selected,the relation curves between dielectric parameters and frequencies were obtained to analyze the differences in characteristic parameters.【Result】The dielectric parameters and testing frequencies were significantly correlated both in fresh and salted duck eggs.Within the entire test frequency range (500-5 000 000 Hz),there were very significant differences between the relative dielectric constant ε′r;whereas the loss coefficient D showed large relative error.Due to no significant difference,complex impedance Z was not used.【Conclusion】The relative dielectric constant ε′r could be used as characteristic dielectric parameter to distinguish fresh and salted duck eggs,and the optimum frequency range was 200 000-2 000 000 Hz. |
| Key words: salted duck egg dielectric properties characteristic dielectric parameter non-destructive monitoring |
