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介电常数与煎炸油中极性组分含量有较好相关性,用于评价煎炸油品质,具有快速、便捷、安全等优点。本文分析了液体介电特性的测试原理和煎炸油介电特性机制,列出极性组分和介电常数的相关性拟合模型。以商业化应用广泛的FOS、FOM 310、Testo 270三类快速检测仪器为对象,对其内部构造、仪器操作和数据可靠性进行评价,结合餐饮业实践经验总结了影响其检测准确度的主要因素,包括煎炸油品种、校准体系、悬浮物、操作规范性。最后,提出此快速检测技术未来的两大发展方向:对信号处理参数的特异性优化和对数据处理技术或红外在线检测技术的引入结合。
Dielectric constant and frying oil polar component content has a good correlation, used to evaluate the quality of frying oil, with fast, convenient, safe and so on. This paper analyzes the test principle of the dielectric property of the liquid and the mechanism of the dielectric properties of the frying oil, and lists the correlation fitting models of the polar components and dielectric constant. This paper evaluates the internal structure, instrumentation and data reliability of FOS, FOM 310 and Testo 270, which are widely used in commercial applications. Combining with the experience of the restaurant industry, the main factors affecting the accuracy of the detection are summarized , Including the varieties of frying oil, calibration system, suspended solids, norms of operation. Finally, two future directions of this rapid detection technology are proposed: the optimization of signal processing parameters and the combination of data processing or infrared on-line detection technology.