Development Of On-line Detection Device For Liquor Picking Based On Near-infrared Technology

Liquor is a unique wine in China.It has a wide range of consumers and plays an important role in thecomposition of China's national economy.Therefore,it is particularly important to ensure the quality of liquor.The traditional methods of wine picking mainly include foam-checking wine picking,mass wine picking and segmented wine picking.The production cycle is long and the efficiency is low.It has strong personal dependence on the wine picker.Although the appearance of mechanized wine picking makes up for some shortcomings,it is difficult to achieve flexibility in manual operation.Compared with the traditional method of picking wine,NIR spectroscopy shortens the production cycle and improves the efficiency of picking wine.It can detect multiple parameters at the same time without damaging the sample.It is an efficient green detection method.In this paper,near-infrared spectroscopy combined with chemometrics method was employed for on-line detection of liquor,PLC control software was used for online control,quantitative analysis was conducted on alcohol concentration in liquor,so as to achieve automatic wine picking and online simulation test in wine picking.The main research contents and conclusions are as follows:(1)In order to realize online detection and real-time control of liquor quality,starting from the extraction of wine picking characteristics,the overall design scheme of online picking and real-time control system based on near-infrared spectroscopy was determined,and module partitioning method was employed to divide the whole system into the wine extraction detection module,the control module of wine quality level,and the execution module of wine quality level,while the wine extraction detection module was divided into a near-infrared spectrum acquisition sub-module and a computer spectrum analysis sub-module.The function of the near-infrared spectrum acquisition sub-module was to collect the near-infrared spectrum of the original wine online.The function of the computer spectrum analysis sub-module was to analyze the collected spectrum in real time and transmit the analysis result to the quality level control module.The level control module was mainly completed by the PLC programmable controller.According to the collected spectrum and analysis results,the closing of each solenoid valve was automatically controlled after programming;the execution module of the wine quality level was controlled by controlling different levels of solenoid valve action control.The execution module of winequality level controlled flow of different quality grades during wine picking to realize the function of automatic wine picking.(2)In order to meet test requirements of the online simulation test bench for wine extraction,from the aspects of accuracy,range matching and cost performance,the main working hardware of the online test simulation test bench was selected reasonably,and the SE series working wavelength was selected.The miniature near-infrared spectroscopy sensor with a range of 1.55 ? 1.95 ?m was the core detection device of the test bench,which can meet the needs of on-line detection of multiple chemical indicators including alcohol content and hexyl acetate during the wine picking process.The light source was selected from Welch Allyn Company of the United States.The 997418-21 type tungsten halogen lamp was used;the PLC controller selected the Delta SS series DVP14SS11R2 model as the control component;the solenoid valve used the gold magnetic 2W series 2/2-way direct-acting diaphragm type explosion-proof solenoid valve.Finally,the piping and container of the test bench and the spatial structure layout were designed.(3)Some software design and programming of the online test simulation test bench were completed for liquor picking.LinkSpec acquisition software was used to complete the spectrum acquisition,NIRSA4.6stoichiometry method was used for modeling,and PLC control software was used to realize control of the test bench.Based on the LinkSpec acquisition software,the LinkSpec extension module software was designed and developed to realize the coordinated operation of the data acquisition module,the online detection module and the control module.After the program debugging and testing,the spectrum detection part of the liquor testing online simulation test bench was carried out.The grading control part of the original wine grade was safe and reliable,and the test bench had achieved the expected goal.(4)In order to verify the on-line detection of liquor and the actual working effect of the original wine classification,the prediction model of alcohol concentration was established in the offline state,and the prediction effect of the model was analyzed.For the samples,the non-interpolated data was preprocessed by FD,and the model prediction results obtained by partial least squares regression were better than those of progressive forward regression and principal component regression.The predicted relative standard deviation RMSECP was less than 0.8739.Bringing the above-mentioned best model to the LinkSpec extension module software and simulating the test of online wine picking,according to the pre-set three levels of alcohol concentration standards(66% or more,66% to 47%,47% or less),the alcohol extractiontest was carried out.The three levels of alcohol obtained in the simulation test were 69.5%,58.6% and41.8%,respectively.The results showed that the alcohol concentration measured by the simulation test was within the predetermined alcohol concentration range,indicating that the test bench could realize the function of online wine quality detection and control.