CN211292687U - Wine SO2Electronic nose device for concentration determination - Google Patents
Wine SO2Electronic nose device for concentration determination Download PDFInfo
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- CN211292687U CN211292687U CN201922197548.0U CN201922197548U CN211292687U CN 211292687 U CN211292687 U CN 211292687U CN 201922197548 U CN201922197548 U CN 201922197548U CN 211292687 U CN211292687 U CN 211292687U
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Abstract
The utility model discloses a be used for grape wine SO2The electronic nose device for concentration determination comprises a clean air source, a first mass flow controller, a second mass flow controller, a first one-way valve, a second one-way valve, a headspace bottle, a test cavity, a gas sensor array and a control analysis module; the headspace bottle is stored with a wine sample to be detected and is provided with an air inlet pipe and an air outlet pipe, the air inlet pipe is arranged below the liquid level of the wine sample, and the air outlet pipe is arranged above the liquid level of the wine; the gas sensor array is arranged in the test cavity, and information acquired by the gas sensor array is transmitted by the acquisition cardThe data is input to a control analysis module; the control analysis module is used for processing and analyzing the data. Therefore, the utility model is used for the wine SO2The electronic nose device for measuring the concentration ensures that the gas sensor is only contacted with a sample during testing, and is cleaned by clean air in the rest time, thereby ensuring the working stability of the gas sensor array and avoiding the poisoning phenomenon of the gas sensor.
Description
Technical Field
The utility model relates to an electron nose system, food monitoring field especially relate to one kind and are used for grape wine SO2Electronic nose device for concentration determination.
Background
Along with the rapid development of economy in China, the living standard of substances is improved, and more food safety problems are concerned by manufacturers, consumers and supervision departments. Sulfur dioxide (SO)2) Is one of the most common food additives at home and abroad, is generally applied to various food industries including various fruit and vegetable drying, preserved fruit and preserved fruit production and the like, mainly plays roles of sterilization, preservation, corrosion prevention, oxidation resistance and the like, and SO is used in the wine industry2The effects of the method also comprise important effects of increasing acid, increasing color, controlling fermentation time, improving quality and flavor of the wine and the like. When SO2If the addition amount of (A) is too small, the quality of the wine is seriously influenced; when SO2When added in excess, it may cause diseases or injuries to the human body. Therefore, whether concentration control for the brewing process or residual quantity detection in the product is critical to the control of SO in wine2Measurement of the concentration of (2).
At present, measuring SO in the wine2The concentration of (A) is determined by chemical methods such as oxidation, direct iodometry and distillation, and by instrumental methods such as ion chromatography, flow injection and high performance liquid chromatography. The chemical method is simple to operate, the price is low, but a large amount of time is needed for the preparation and calibration of the medicine; the instrument method has high accuracy, but the instrument price is higher. In recent years, the electronic nose technology is rapidly developed by virtue of the advantages of low cost, quick response, simple operation and the like, and is widely applied to the field of wine, including traceability, anti-counterfeiting and quality classificationGrade and odor detection, etc. In practice, if the electronic nose is not operated properly, it may seriously affect the end result, even the phenomena of drift or "poisoning" caused by long-term contact of the sensitive probe of the electronic nose with the wine sample with complex composition, which damages the electronic nose system itself. Therefore, there is a need to design a SO for wine2The electronic nose system for concentration testing has important significance.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: provides a method for preparing wine SO2Electronic nose device for concentration determination.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is:
wine SO2The electronic nose device for concentration determination comprises a clean air source, a first mass flow controller, a second mass flow controller, a first one-way valve, a second one-way valve, a headspace bottle, a test cavity, a gas sensor array and a control analysis module; the headspace bottle is stored with a wine sample to be detected, and is provided with an air inlet pipe and an air outlet pipe, wherein one end of the air inlet pipe in the headspace bottle is arranged below the liquid level of the wine sample, and one end of the air outlet pipe in the headspace bottle is arranged above the liquid level of the wine to be detected;
the clean air source is respectively connected with the air inlets of a first mass flow controller and a second mass flow controller through air pipes, the air outlet of the first mass flow controller is connected with the air inlet of a first one-way valve through an air pipe, the air outlet of the second mass flow controller is connected with the air inlet pipe of a headspace bottle, the air outlet pipe of the headspace bottle is connected with the air inlet of a second one-way valve, the air outlet of the second one-way valve is connected with the air inlet of the first one-way valve, the air outlet of the first one-way valve is connected with the air inlet of the test chamber through an air pipe, and the air outlet of the test chamber discharges tail gas through an air pipe; a gas sensor array is arranged in the test cavity, and information acquired by the gas sensor array is transmitted to the control analysis module;
and the control analysis module is used for processing and analyzing the data acquired by the gas sensor array.
Compared with the prior art, the utility model discloses following technological effect has:
the gas sensor is only contacted with a sample during testing, and the rest time is cleaned by clean air, so that the working stability of the gas sensor array is ensured, and the poisoning phenomenon of the gas sensor is avoided.
On the basis of the technical scheme, the utility model discloses can also do following improvement.
Preferably, the gas sensor array comprises at least two different types of gas sensors.
The gas sensor array has the beneficial effects that the gas sensor array is formed by simultaneously arranging the gas sensors with different reaction mechanisms and different models, and the gas sensor array not only aims at SO2The selective gas sensor comprises a non-selective gas sensor with broad spectrum characteristics, so that the capability of the electronic nose on resisting drift and interference can be enhanced, and the measurement result is more reliable and stable.
Preferably, the gas sensor array comprises 15 metal oxide semiconductor gas sensors and 1 electrochemical-type gas sensor.
Preferably, the gas sensor array comprises 2 each of TGS2602, TGS2600, TGS2610, TGS2611, TGS2630 of Figaro and WSP7110 of weisheng, 1 each of TGS2603, TGS2612, TGS2620, TGS2630 of Figaro and 4SO2-20 of Honeywell.
Preferably, the control analysis module comprises a data acquisition card, a microcomputer and a related interface circuit, and Labview software is installed in the microcomputer to realize control of gas transmission state conversion.
The technical scheme has the advantages that the microcomputer works stably and is low in price, and the Labview software is mature computer software and can conveniently guide signals of various sensors into the microcomputer through the data acquisition card. The independent industrial control analysis instrument is not arranged for the electronic nose, and the hardware cost of the electronic nose equipment is reduced.
Preferably, the first mass flow controller and the second mass flow controller are connected with the control analysis module, and the control analysis module controls the state transformation of the first mass flow controller and the second mass flow controller.
The beneficial effect of adopting above-mentioned further scheme is that, can realize automatic control through control analysis module, reduce survey crew's working strength.
The beneficial effects of adopting above-mentioned further scheme are that the cost of clean air is low, reduces the running cost of electron nose.
Drawings
Fig. 1 is a schematic structural diagram of the electronic nose device for measuring the concentration of wine SO2 according to the present invention;
FIG. 2 is a typical response curve for a gas sensor in an example;
FIG. 3 is a detailed prediction of the neural network model in an example;
in the drawings, the parts names represented by the respective reference numerals are listed as follows:
1. a clean air source; 2. a first mass flow controller; 3. a second mass flow controller; 4. a first one-way valve; 5. a second one-way valve; 6. a headspace bottle; 7. a test chamber; 8. an array of gas sensors; 9. a gas sensor; 10. collecting cards; 11. and controlling an analysis module.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
Please refer to fig. 1, which is a diagram of the utility model for wine SO2Schematic structure diagram of electronic nose device for concentration determination. The method is used for preparing wine SO2The electronic nose device for concentration determination comprises a clean air source 1, a first mass flow controller 2, a second mass flow controller 3, a first one-way valve 4, a second one-way valve 5, a headspace bottle 6, a test cavity 7, a gas sensor array 8 and a control analysis module; in the headspace bottle 6A wine sample to be measured is stored in the headspace bottle, the headspace bottle is provided with an air inlet pipe and an air outlet pipe, one end of the air inlet pipe in the headspace bottle is arranged below the liquid level of the wine sample, one end of the air outlet pipe in the headspace bottle is arranged above the liquid level of the wine to be measured, wherein,
the clean air source 1 is respectively connected with air inlets of a first mass flow controller 2 and a second mass flow controller 3 through air pipes, an air outlet of the first mass flow controller 2 is connected with an air inlet of a first one-way valve 4 through an air pipe, an air outlet of the second mass flow controller 3 is connected with an air inlet pipe of a headspace bottle 6, an air outlet pipe of the headspace bottle 6 is connected with an air inlet of a second one-way valve 5, an air outlet of the second one-way valve 5 is connected with an air inlet of the first one-way valve 4, an air outlet of the first one-way valve is connected with an air inlet of a test chamber 7 through an air pipe, and an air outlet of the test chamber 7 discharges tail gas through an air pipe;
a gas sensor array 8 is arranged in the test cavity 7, the gas sensor array 8 comprises a plurality of gas sensors 9, and acquired information is transmitted to the control analysis module 11 through an acquisition card 10;
the control analysis module 11 is used for processing and analyzing the data collected by the gas sensor array 8.
In this example, SO was added to the sample wine at concentrations of 0, 40, 80, 120, 160, 200ppm, respectively2The clean air source continuously provides clean air.
The specific measurement process is as follows:
in the first step, purge, open first mass flow controller 2 and close second mass flow controller 3, second one-way valve 5 prevents clean air from entering headspace bottle 6, so air passes directly into test chamber 7 and contacts gas sensor array 8, restoring the response of the gas sensor to baseline levels, with the duration and gas flow of this step being 20min and 300sccm respectively.
And secondly, ventilation measurement is carried out, the first mass flow controller 2 is closed, the second mass flow controller 3 is opened, clean air enters the headspace bottle 6 through the second mass flow controller 3, mixed gas containing the wine sample is pumped out, the first one-way valve 4 prevents backflow of the mixed gas from completely entering the testing cavity 7, the gas sensor array 8 in the testing cavity 7 responds to the mixed gas containing the wine sample, and the duration time and the gas flow of the step are respectively 3min and 100 sccm.
In the collecting process, the actual contact time between the complex components of the wine and the gas sensor is only 3min, and the clean air is used for washing gas for 20min before and after the collecting process, so that the phenomena of 'poisoning' of the electronic nose and the like are well prevented. A typical response curve for a gas sensor is shown in fig. 2.
Description of the data: there were 6 different SOs in the examples2Wine of concentration, 8 samples of each concentration, 3 tests of each sample, a total of 6 × 8, 8 × 3 and 144 pieces of data were obtained.
After all the data are obtained, preprocessing is carried out on all the data, and two characteristic parameters of a maximum response value and a differential response value are extracted to be used as a characteristic space of the data. Each time 3 measurements from the same wine sample were used as test set and the other data as training set, in such a way that overfitting phenomena caused by sample overlap of training set and test set were avoided. Fitting SO in wine on training set through feedforward type neural network2Regression curves of concentration and validation with test set.
The mean square error of the regression model was 32.26, the coefficient of determination was 0.993, and the detailed test results are shown in fig. 3, which shows good regression effect.
Other optimizations for the e-nose, such as gas sensor arrays, computational complexity, etc., may be accomplished by programming or other associated software.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (6)
1. Wine SO2Electronic nose device for concentration determination, characterized in thatThe device comprises a clean air source, a first mass flow controller, a second mass flow controller, a first one-way valve, a second one-way valve, a headspace bottle, a test cavity, a gas sensor array and a control analysis module; the headspace bottle is stored with a wine sample to be tested and is provided with an air inlet pipe and an air outlet pipe, one end of the air inlet pipe in the headspace bottle is arranged below the liquid level of the wine sample, one end of the air outlet pipe in the headspace bottle is arranged above the liquid level of the wine to be tested, wherein,
the clean air source is respectively connected with the air inlets of a first mass flow controller and a second mass flow controller through air pipes, the air outlet of the first mass flow controller is connected with the air inlet of a first one-way valve through an air pipe, the air outlet of the second mass flow controller is connected with the air inlet pipe of a headspace bottle, the air outlet pipe of the headspace bottle is connected with the air inlet of a second one-way valve, the air outlet of the second one-way valve is connected with the air inlet of the first one-way valve, the air outlet of the first one-way valve is connected with the air inlet of the test chamber through an air pipe, and the air outlet of the test chamber discharges tail gas through an air pipe;
a gas sensor array is arranged in the test cavity, and information acquired by the gas sensor array is transmitted to the control analysis module;
and the control analysis module is used for processing and analyzing the data acquired by the gas sensor array.
2. Wine SO according to claim 1 for use in2Electronic nose device for concentration determination, characterized in that said array of gas sensors comprises at least two different types of gas sensors.
3. Wine SO according to claim 2 for use in2Electronic nose device for concentration determination, characterized in that said array of gas sensors comprises 15 metal oxide semiconductor gas sensors and 1 gas sensor of electrochemical type.
4. According to the claimsClaim 3 for wine SO2Electronic nose device for concentration determination, characterized in that the gas sensor array comprises 2 each of TGS2602, TGS2600, TGS2610, TGS2611, TGS2630, WSP7110, 1 each of TGS2603, TGS2612, TGS2620 and TGS2630 and 4SO 2-20.
5. Wine SO according to claim 1 or 2 for use2The electronic nose device for measuring concentration is characterized in that the control analysis module comprises a data acquisition card, a microcomputer and a related interface circuit.
6. Wine SO according to claim 1 or 2 for use2The electronic nose device for concentration measurement is characterized in that the first mass flow controller and the second mass flow controller are electrically connected with the control analysis module, and the control analysis module controls the state transformation of the first mass flow controller and the second mass flow controller.
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| CN201922197548.0U CN211292687U (en) | 2019-12-10 | 2019-12-10 | Wine SO2Electronic nose device for concentration determination |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924626A (en) * | 2021-01-28 | 2021-06-08 | 言谱物(杭州)智能科技有限责任公司 | Electronic nose device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924626A (en) * | 2021-01-28 | 2021-06-08 | 言谱物(杭州)智能科技有限责任公司 | Electronic nose device |
| CN112924626B (en) * | 2021-01-28 | 2023-05-23 | 言谱物(杭州)智能科技有限责任公司 | Electronic nose device |
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