College of Automation Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 211106, China.
Department of Electrical and Electronic Engineering, The University of Manchester, Manchester, M13 9PL, UK.
J Food Sci. 2021 Jun;86(6):2513-2524. doi: 10.1111/1750-3841.15738. Epub 2021 Apr 28.
The complex electric permittivity of Baijiu (one of the most consumed beverages) is measured over a frequency range of 2 to 20 GHz using a low-cost open-ended coaxial probe and a portable microwave analyzer. The Cole-Cole equation is used to fit the permittivity data, and the parameter values related are extracted using the particle swarm optimization. A linear relationship is obtained between these parameters and the alcohol by volume. A strong dependence of the permittivity on the alcohol content is also observed for other alcoholic drinks, including brandy and whisky. The study demonstrates that the microwave technique provides an efficient solution in the effort to determine the alcohol content and the principal component analysis is a powerful tool for the quick estimation of the dielectric properties. The sensor presented can contribute to efficient on-site quality control of alcoholic drinks. PRACTICAL APPLICATION: The microwave approach presented could offer an economical approach for the characterization of Baijiu and a general solution to the alcohol content determination for the alcoholic drinks industry.
使用低成本的开放式同轴探头和便携式微波分析仪，在 2 至 20 GHz 的频率范围内测量了白酒（消费最多的饮料之一）的复介电常数。使用科尔-科尔方程对介电常数数据进行拟合，并使用粒子群优化算法提取相关参数值。这些参数与体积酒精之间存在线性关系。对于其他含酒精的饮料，包括白兰地和威士忌，也观察到介电常数与酒精含量之间存在很强的依赖性。该研究表明，微波技术在确定酒精含量方面提供了一种有效的解决方案，主成分分析是快速估计介电性能的有力工具。所提出的传感器可以有助于对酒精饮料进行高效的现场质量控制。
所提出的微波方法可以为白酒的特性分析提供一种经济的方法，也可以为酒精饮料行业的酒精含量测定提供一个通用的解决方案。
