Abstract
Lack of moisture can lead to the aging of pit mud, excessive moisture will make it difficult to maintain its shape or even collapse. Therefore, a rapid and nondestructive detection technology for moisture in pit mud using hyperspectral imaging was firstly investigated. Modeling efficiency of various processing was compared in visible (400–1,000 nm) and near‐infrared (900–1,700 nm) regions, and the optimal model was SNV‐SPA‐SVM in near‐infrared spectroscopy; the Rpre2 and RMSEP of model were .9953 and 0.0029, respectively. Furthermore, the distribution map showed that the moisture in the new cellar was generally lower than that of old, and the moisture distribution of the old pit mud was more even. Moreover, the moisture content of different layers in the same cellar increased from top to bottom. This work provides strong technical support for liquor brewing enterprises to effectively implement online monitoring of pit mud changes and open a new era for the application of hyperspectral imaging technology in the field of liquor solid‐state fermentation.
Highlights
As one of the six distilled liquor in the world, Chinese baijiu is an invention that full of creative wisdom and cultural charm in China
Zhu et al (2016) used hyperspectral to investigate the moisture and total acid content of vinegar, and the results showed that it was feasible to determine changes in the main indicators during solid-state fermentation using hyperspectral imaging
It can be seen that wide variations in moisture contents ranging from 30% to 40% were obtained, which was the basic data for the establishment of calibration model
Summary
As one of the six distilled liquor in the world, Chinese baijiu is an invention that full of creative wisdom and cultural charm in China. The production and market share of Luzhou-flavor liquor account for about 70% of the entire liquor industry (Hu, 2015). As the foundation for the brewing of Luzhou-flavor liquor, pit mud determines the quality of product to a large extent. The water in pit mud dissolves various organic matter and mineral nutrients and acts as a transporting substance. A series of biochemical reactions in the microbial organism is inseparable from water (Zhang et al, 2013). The excessive moisture will result in that it is hard to maintain shape even the collapse of the pit. The moisture of the mud is regarded as a crucial detection indicator in the evaluation standard of the Luzhouflavor liquor
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