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Characterisation and analysis of alcohol in baijiu with a microwave cavity resonator

机译：微波腔谐振器Baijiu中酒精的特征与分析

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摘要

The world's most consumed liquor-baijiu is characterised by measuring the perturbation in the resonance condition of a cylindrical microwave cavity as a function of alcohol content. Compared with other methods, the microwave sensor described here is compact, portable, low-cost and need of a small sample size (<0.1 mL) of liquid. The dielectric properties are obtained from the shift of the resonance frequency and changes in the quality factor. The measurement accuracy is validated by comparison with standard liquid samples, where high estimation accuracy (better than 6%) is achieved. The resonant responses and permittivity of baijiu samples are evaluated, where the alcohol content has a significant effect. Six other types of alcoholic drinks and ethanolwater mixtures were also measured for comparison purposes. From all the experimental results, it is demonstrated that the alcohol by volume can be readily deduced from the regressed functions obtained. In addition, the principal component analysis is successfully applied to the classification of liquids with varied alcohol contents.
机译：世界上消耗量最大的白酒白酒的特点是测量圆柱形微波腔共振条件下的扰动，作为酒精含量的函数。与其他方法相比，本文描述的微波传感器结构紧凑、便携、成本低，并且需要较小的液体样本量（<0.1ml）。介电性能由谐振频率的偏移和品质因数的变化得到。通过与标准液体样品的比较，验证了测量精度，从而获得了较高的估计精度（优于6%）。评估了白酒样品的共振响应和介电常数，其中酒精含量有显著影响。为了进行比较，还测量了其他六种类型的酒精饮料和乙醇水混合物。从所有的实验结果来看，可以很容易地从得到的回归函数中推断出乙醇的体积比。此外，主成分分析还成功地应用于不同酒精含量液体的分类。

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