Straw solid-state fermentation process parameter soft measurement method and device based on near infrared spectrum

Abstract

The invention discloses a straw solid-state fermentation process parameter soft measurement method and a device based on near infrared spectrum. Firstly, a physical and chemical analysis method is adopted for obtaining solid-state fermentation process product sample reference measurement values to form a database, a near infrared spectrometer is used for acquiring spectral data, the acquired spectral data is transmitted to a computer, the computer conducts principal component analysis to the preprocessed spectral data to obtain the eigenvalue information of a principal component score matrix and a spectrum covariance matrix, cumulative variance contribution rate is calculated through an eigenvalue matrix, and first few principal component score vectors of the score matrix with the cumulative variance contribution rate being above 90 percent are extracted as the characteristic variables of a solid-state fermentation process product sample; then the characteristic variables of a solid-state fermentation process product sample are correlated with the database and a partial least square method is adopted for building a multi-parameter soft measurement model; and finally the obtained characteristic variables of the sample to be detected are input into the model for detection to obtain the predicted value of the process parameter index of the sample to be detected. The straw solid-state fermentation process parameter soft measurement method and the device based on near infrared spectrum have the advantages of simplicity and convenience in operation, high detection speed and good repeatability.

Description

technical field [0001] The invention relates to the field of solid-state fermentation process control, in particular to a method and device for soft measurement of straw solid-state fermentation process parameters based on near-infrared spectroscopy. Background technique [0002] Crop straw is the fourth largest energy in the world after coal, oil and natural gas. According to relevant statistics, my country can produce nearly 700 million tons of straw every year, mainly corn, wheat and rice straw, accounting for 80% of the total straw production, but the utilization rate is very low, most of them are directly burned, and a small part of them are returned to the machinery. field. Incineration not only wastes resources, but also causes great damage to natural resources. With the development of agricultural biotechnology, the use of biotechnology, especially through microbial solid-state fermentation, to treat straw and make it green resources such as bio-feed, bio-fertilizer...

AI Technical Summary

Problems solved by technology

Although the results of the chemical detection method are objective and credible, the steps are cumbersome, the detection time is long, the detection cost is high, and the off-line measurement brings a lot of inconvenience to the control and optimization of fermentation engineering

Therefore, it is not conducive to the optimal control of the state information variables of the entire fermentation process

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