Baijiu alcohol content determination method

Abstract

The invention relates to a Baijiu alcohol content determination method, wherein the method comprises the following steps: a sample spectrum collection step: preparing ethanol solutions with different concentrations, and collecting infrared spectra of the ethanol solutions with different concentrations; a model establishment step: dividing the collected infrared spectrum data of the samples into a training data set and a test data set by using a Scikit-learn library, normalizing the data of the training data set, and importing the normalized data as an input variable into a random forest model for training to obtain a prediction model; and an alcoholic strength determination step: collecting the infrared spectrum of the tested Baijiu, and determining the alcoholic strength of the tested Baijiu by using the prediction model. The method provided by the invention does not need sample pretreatment, is simple to operate, only needs to collect the spectrogram of the detected Baijiu, completely utilizes all spectroscopic data, and can realize nondestructive, rapid and accurate detection of the alcoholic strength of the Baijiu.

Description

technical field [0001] The invention relates to the determination of alcohol content, in particular to a method for determining the alcohol content of liquor. Background technique [0002] my country is a big liquor consumption country. With the improvement of living standards, people have higher and higher requirements for the quality of liquor. Liquor is obtained by fermenting and distilling raw materials. Ethanol and water are the main components of liquor, and the content accounts for more than 98%, and the content of other aroma substances is 1% to 2%. In liquor, the higher the volume percentage of ethanol, the higher the alcohol content of the liquor and the stronger the liquor. Determination of ethanol content in liquor is of great significance for controlling the quality of liquor. [0003] Near-infrared spectroscopy has the characteristics of no need for sample pretreatment, simple operation, no loss, and the ability to analyze multiple components at the same time...

AI Technical Summary

Problems solved by technology

In recent years, near-infrared spectroscopy technology has also been applied in the field of liquor determination. For example, the Chinese invention patent application No. 201310034485.1 uses infrared spectroscopy to identify the quality of liquor, and the Chinese invention patent application No. 200910228700.5 uses infrared spectroscopy to identify the aroma of liquor. , the Chinese invention patent application with the application number 201610421078.X uses near-infrared light spectroscopy to determine the concentration of liquor. The above methods are based on infrared absorption spectroscopy to determine the concentration of liquor, but some of the above methods need to use an incubator during the measurement process, or Freeze-drying treatment is required, the operation process is complicated, and a large number of liquor samples are required, the cost is high, and preprocessing is required when processing the data, and the characteristic peaks are compared by artificial vision, which has a great influence on subjectivity and cannot analyze the infrared absorption spectrum. Reasonable use of each characteristic peak of the method takes a long time, and it is impossible to achieve non-destructive rapid detection

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