CN102288574A - Device and method for quantitatively analyzing concentration of multi-component oil fume - Google Patents
Device and method for quantitatively analyzing concentration of multi-component oil fume Download PDFInfo
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- CN102288574A CN102288574A CN2011101911925A CN201110191192A CN102288574A CN 102288574 A CN102288574 A CN 102288574A CN 2011101911925 A CN2011101911925 A CN 2011101911925A CN 201110191192 A CN201110191192 A CN 201110191192A CN 102288574 A CN102288574 A CN 102288574A
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- oil smoke
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- pyroelectric detector
- infrared light
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Abstract
The invention relates to a device and a method for quantitatively analyzing the concentration of multi-component oil fume. The device comprises a signal processing circuit, a gas pipe shell, an oil fume gas inlet, an oil fume gas outlet, a first quartz glass sheet, a second quartz glass sheet, a pyroelectric detector and four infrared light sources, wherein the four infrared light sources are arranged at one end of the gas pipe shell in parallel; the pyroelectric detector is arranged at the other end of the gas pipe shell; four detection channels of the pyroelectric detector are respectively provided with optical filters of different wavelengths; each infrared light source faces one of the detection channels of the pyroelectric detector; and an output end of the pyroelectric detector is connected with the signal processing circuit. In the method, a ratio F of a gas logging channel to a reference channel is obtained by the device, and the material concentration of corresponding wave number can be obtained by respectively substituting fitting formulae according to the characteristics of the pyroelectric detector and a Lambert-Beer law. The invention has the advantages of real-time performance, quantitative property and high sensitivity.
Description
Technical field
The present invention relates to a kind of analytical equipment and method of oil smoke concentration, being specifically related to is a kind of polycomponent oil smoke concentration quantitative analysis device and analytical approach thereof.
Background technology
Along with socioeconomic fast development, the tertiary industry also is surging forward.Because the catering trade planning construction lags behind with management is serious, the fume pollution of its generation has had a strong impact on surrounding resident and has lived normally, so the fume pollution of the catering trade problem that disturbs residents just becomes the environment in recent years letters and calls masses and complains one of maximum environmental problem.The atmosphere pollution that oil smoke discharged is mainly gasoloid, wherein contain edible oil and food volatile matter at high temperature, and the oxidation of edible oil and food, cracking, hydrolysis and the aldehydes, ketone, paraffinic and the products such as chain alkene, palycyclic aromatic that form, composition is very complicated, and human body is had very big harmfulness.
It is the work of a complexity that oil smoke detects, and the equipment and the method that are used for the oil smoke detection on the present domestic and international market are a lot, (1) traditional infrared spectrophotometric method for example, by oil smoke is sampled, extracts, measures, is calculated, draw oil smoke concentration, it can accurately carry out detection computations to oil smoke concentration, but required sampling time and to draw the data time cycle long.(2) gas detector method uses catalyzer to make oil smoke gas and concentrated sulphuric acid generation decomposition reaction, differentiates oil smoke concentration by the depth of estimating dark reactant, and this method is fast and convenient, and is with low cost, but can't monitor oil smoke concentration in real time; (3) based on the oil smoke remote wireless monitoring system of gas sensor, can detect oil smoke concentration in real time, cause serviceable life short but detector is easily covered by oil smoke, and differ greatly through oil smoke and the standard oil smoke after the metal screen filtration.Problems such as in sum, existing detection technique all exists real-time poor, and the life-span is short, and precision is low.
Summary of the invention
In order to address the above problem, the invention provides unlike the prior art a kind ofly, real-time is good, and the life-span is long, polycomponent oil smoke concentration quantitative analysis device and analytical approach thereof that precision is high.The technical solution adopted in the present invention is as follows.
Polycomponent oil smoke concentration quantitative analysis device comprises signal processing circuit, tracheae housing, oil smoke air intake opening, oil smoke gas outlet, first quartz glass plate, second quartz glass plate, pyroelectric detector and four infrared light supplies; Described four infrared light supplies are installed in an end of tracheae housing side by side, described pyroelectric detector is installed in the other end of tracheae housing, four detection channels of pyroelectric detector are installed the optical filter of different wave length respectively, and each infrared light supply is separately over against a detection channels of pyroelectric detector; Side in the tracheae housing is provided with described first quartz glass plate that infrared light supply and oil smoke are kept apart, and opposite side is provided with second quartz glass plate that pyroelectric detector and oil smoke are kept apart; The oil smoke air intake opening is positioned at the upper right side of tracheae housing, and the oil smoke gas outlet is positioned at the lower left of tracheae housing, and oil smoke air intake opening and oil smoke gas outlet are between first quartz glass plate and second quartz glass plate; Each infrared light supply all is arranged in a concave surface condenser; The output terminal of pyroelectric detector is connected with signal processing circuit, and described signal processing circuit is used for signal is carried out filtering, amplification, AD conversion and uses single-chip microcomputer to carry out processes and displays.
In the above-mentioned polycomponent oil smoke concentration quantitative analysis device, described signal processing circuit comprises filtering circuit, amplifying circuit, AD converter and the single-chip microcomputer that connects in turn.
In the above-mentioned polycomponent oil smoke concentration quantitative analysis device, described pyroelectric detector has following characteristic:
V in the formula
GasAnd V
RefSurvey the output voltage of passage and reference channel for detector gas; I is an incident intensity; R
GasAnd R
RefBe respectively gas and survey the responsiveness of passage and reference channel; C
GasAnd C
RefBe respectively gas and survey the characteristic constant of passage and reference channel; K is the absorption coefficient of gas; L is the length of detector tube; C is a gas concentration to be measured.
In the above-mentioned polycomponent oil smoke concentration quantitative analysis device, the reference channel of described pyroelectric detector uses 4.0 μ m optical filters, and three gas are surveyed passage and used corresponding wave number to be 2930cm
-1, 2960cm
-1, 3030cm
-1Optical filter, three kinds of important group: CH in the corresponding oil smoke
2Group, CH
3Group, aromatic group.
Above-mentioned polycomponent oil smoke concentration quantitative analysis device, the central optical axis of the corresponding gas passage of described each infrared light supply and pyroelectric detector is positioned on the same axis, thereby guarantee that each detector receiving cable obtains identical emission light intensity, improved the sensitivity that detects.
Above-mentioned polycomponent oil smoke concentration quantitative analysis device, described infrared light supply wavelength coverage, and are placed in the concave surface condenser between the 5 μ m at 2 μ m, have strengthened the light emitted light intensity, improve the sensitivity that detects.
Above-mentioned polycomponent oil smoke concentration quantitative analysis device is characterized in that described quartz glass wafer opens infrared light supply and pyroelectric detector and oil smoke channel separation, thereby prevents that device from being covered by oil smoke, improves serviceable life.
The quantitative analysis method of a kind of polycomponent oil smoke concentration, its step comprises:
(1) is 0% o'clock at oil smoke concentration, records corresponding gas and survey channel data V
Gas0With reference channel V
Ref0, obtain K
0=V
Gas0/ V
Ref0
(2) use the standard oil smoke of pristane, n-hexadecane, toluene configuration variable concentrations, keep n-hexadecane, toluene concentration constant, change the concentration of pristane, recording wave number is 2930cm
-1Gas survey channel data V
GasWith reference channel V
Ref, calculate its ratio F=V
Gas/ V
Ref
(3) make the pristane concentration C and record ratio F graph of a relation, and carry out curve fitting, obtain fitting formula, C=W
1* F
5+ W
2* F
4+ W
3* F
3+ W
4* F
2+ W
5* F, W in the formula
1, W
2, W
3, W
4, W
5Be respectively the fitting coefficient that calculates, the material concentration of C for measuring, F is the ratio that reference channel voltage and corresponding gas are surveyed channel voltage.
(4) in like manner set up graph of a relation and fitting formula between n-hexadecane, toluene and the corresponding ratio F.
The invention has the beneficial effects as follows: utilize the characteristic of oil smoke infrared absorption spectrum and pyroelectric detector directly to detect multi-component concentration in the oil smoke; realize surveying oil smoke concentration fast, in real time, accurately, safely, the inventive method is played a significant role aspect environmental protection.Simultaneously, the present invention detects a kind of real-time, quantitative, highly sensitive means that provide for oil smoke concentration.
Description of drawings
The detector tube synoptic diagram that Fig. 1 detects for special-purpose oil smoke among the present invention.Among the figure: 1. tracheae housing, 2. oil smoke air intake opening, 3. oil smoke gas outlet, 4. first quartz glass plate, 5. second quartz glass plate, 6. concave surface condenser, 7. infrared light supply, 8. pyroelectric detector, 9. optical filter, 10. signal processing circuit, 11. pyroelectric detector output pins.
Fig. 2 is the implementation step process flow diagram of polycomponent oil smoke concentration quantitative analysis method.
Embodiment
Below in conjunction with accompanying drawing enforcement of the present invention is described further, but enforcement of the present invention and protection domain are not limited thereto.
As shown in Figure 1, a kind of polycomponent oil smoke concentration quantitative test pick-up unit comprises tracheae housing 1, oil smoke air intake opening 2, oil smoke gas outlet 3, first quartz glass plate, 4, the second quartz glass plates 5, concave surface condenser 6, infrared light supply 7, pyroelectric detector 8, optical filter 9, signal processing circuit 10 and pyroelectric detector output pin 11.
Four infrared light supplies 7 are installed in an end of tracheae housing 1 side by side, pyroelectric detector 8 is installed in the other end of tracheae housing 1, four detection channels of pyroelectric detector 8 are installed the optical filter 9 of different wave length respectively, and each infrared light supply 7 is separately over against a detection channels of pyroelectric detector 8; Side in tracheae housing 1 is provided with described first quartz glass plate 4 that infrared light supply 7 and oil smoke are kept apart, opposite side is provided with second quartz glass plate 5 that pyroelectric detector 8 and oil smoke are kept apart, thereby prevent that device from being covered by oil smoke, improve serviceable life; Oil smoke air intake opening 2 is positioned at the upper right side of tracheae housing 1, and oil smoke gas outlet 3 is positioned at the lower left of tracheae housing 1, and oil smoke air intake opening 2 and oil smoke gas outlet 3 are between first quartz glass plate 4 and second quartz glass plate 5; Each infrared light supply 7 all is arranged in a concave surface condenser 6, has strengthened the light emitted light intensity, improves the sensitivity that detects; The output terminal pin one 1 of pyroelectric detector is connected with signal processing circuit 10.
Below with wave number 2930cm
-1Corresponding pristane concentration detects and is example, and step is as follows:
(1) at constant temperature 25
oC, normal atmosphere is depressed, and oil smoke concentration is 0% o'clock, and recording the optical filter wave number is 2930cm
-1Gas survey channel data V
Gas0With reference channel V
Ref0, obtain K
0=V
Gas0/ V
Ref0
(2) use the standard oil smoke of pristane, n-hexadecane, toluene configuration variable concentrations, keep n-hexadecane, toluene concentration constant, change the concentration of pristane, recording wave number is 2930cm
-1Gas survey channel data V
GasWith reference channel V
Ref, calculate its ratio F=V
Gas/ V
Ref
(3) make the concentration C of pristane and the graph of a relation of corresponding ratio F.
(4) according to Lambert-Beer's law and Characteristics of detector, output voltage signal
V Gas ,
V Ref With incident intensity
IMeet following relation:
Definition
, can get:
V in the formula
GasAnd V
RefSurvey the output voltage of passage and reference channel for detector gas; I is an incident intensity; R
GasAnd R
RefBe respectively gas and survey the responsiveness of passage and reference channel; C
GasAnd C
RefBe respectively gas and survey the optical filter constant of passage and reference channel; K is the absorption coefficient of gas; L is the length of detector tube; C is a gas concentration to be measured.
As seen,
FWith concentration
CIndex of coincidence relation in theory, utilize polyfit function among the matlab to simulate the polynomial expression formula of F and C:
C=?W
1*F
5+?W
2*F
4+?W
3*F
3+?W
4*F
2+?W
5*F，
W in the formula
1, W
2, W
3, W
4, W
5Be respectively the fitting coefficient that calculates, the material concentration of C for measuring, F is the ratio that reference channel voltage and corresponding gas are surveyed channel voltage.Can calculate corresponding wave number material concentration.
(5) in like manner, the material composition that calculates other wave numbers also can use this method, and optical filter centre wavelength is changed, and repeats the step of (1) (2) (3) (4), can draw the material concentration of corresponding wavelength, thereby realizes the quantitative test of oil smoke multicomponent.
Claims (7)
1. polycomponent oil smoke concentration quantitative analysis device is characterized in that comprising signal processing circuit, tracheae housing, oil smoke air intake opening, oil smoke gas outlet, first quartz glass plate, second quartz glass plate, pyroelectric detector and four infrared light supplies; Described four infrared light supplies are installed in an end of tracheae housing side by side, described pyroelectric detector is installed in the other end of tracheae housing, four detection channels of pyroelectric detector are installed the optical filter of different wave length respectively, and each infrared light supply is separately over against a detection channels of pyroelectric detector; Side in the tracheae housing is provided with described first quartz glass plate that infrared light supply and oil smoke are kept apart, and opposite side is provided with second quartz glass plate that pyroelectric detector and oil smoke are kept apart; The oil smoke air intake opening is positioned at the upper right side of tracheae housing, and the oil smoke gas outlet is positioned at the lower left of tracheae housing, and oil smoke air intake opening and oil smoke gas outlet are between first quartz glass plate and second quartz glass plate; Each infrared light supply all is arranged in a concave surface condenser; The output terminal of pyroelectric detector is connected with signal processing circuit, and described signal processing circuit is used for signal is carried out filtering, amplification, AD conversion and uses single-chip microcomputer to carry out processes and displays.
2. according to the described polycomponent oil smoke concentration of claim 1 quantitative analysis device, it is characterized in that described signal processing circuit comprises filtering circuit, amplifying circuit, AD converter and the single-chip microcomputer that connects in turn.
3. according to the described polycomponent oil smoke concentration of claim 1 quantitative analysis device, it is characterized in that described pyroelectric detector has following characteristic:
V in the formula
GasAnd V
RefSurvey the output voltage of passage and reference channel for detector gas; I is an incident intensity; R
GasAnd R
RefBe respectively gas and survey the responsiveness of passage and reference channel; C
GasAnd C
RefBe respectively gas and survey the optical filter constant of passage and reference channel; K is the absorption coefficient of gas; L is the length of detector tube; C is a gas concentration to be measured.
4. according to claim 1 or 3 described polycomponent oil smoke concentration quantitative analysis devices, it is characterized in that the reference channel of described pyroelectric detector uses 4.0 μ m optical filters, three gas are surveyed passage and are used corresponding wave number to be 2930cm
-1, 2960cm
-1, 3030cm
-1Optical filter, three kinds of important group: CH in the corresponding oil smoke
2Group, CH
3Group, aromatic group.
5. according to the described polycomponent oil smoke concentration of claim 1 quantitative analysis device, it is characterized in that the central optical axis of the corresponding gas passage of described each infrared light supply and pyroelectric detector is positioned on the same axis.
6. according to the described polycomponent oil smoke concentration of claim 1 quantitative analysis device, it is characterized in that described infrared light supply wavelength coverage is 2 μ m ~ 5 μ m, and be placed in the concave surface condenser.
7. polycomponent oil smoke concentration quantitative analysis method is characterized in that comprising step:
(1) is 0% o'clock at oil smoke concentration, records corresponding gas and survey channel data V
Gas0With reference channel V
Ref0, obtain K
0=V
Gas0/ V
Ref0
(2) use the standard oil smoke of pristane, n-hexadecane, toluene configuration variable concentrations, keep n-hexadecane, toluene concentration constant, change the concentration of pristane, recording wave number is 2930cm
-1Gas survey channel data V
GasWith reference channel V
Ref, calculate its ratio F=V
Gas/ V
Ref
(3) make the pristane concentration C and record ratio F graph of a relation, and carry out curve fitting, obtain fitting formula: C=W
1* F
5+ W
2* F
4+ W
3* F
3+ W
4* F
2+ W
5* F, W in the formula
1, W
2, W
3, W
4, W
5Be respectively the fitting coefficient that calculates, the material concentration of C for measuring, F is the ratio that reference channel voltage and corresponding gas are surveyed channel voltage;
(4) in like manner set up graph of a relation and fitting formula between n-hexadecane, toluene and the corresponding ratio F, record the concentration of respective components.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101911925A CN102288574A (en) | 2011-07-08 | 2011-07-08 | Device and method for quantitatively analyzing concentration of multi-component oil fume |
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|---|---|---|---|
| CN2011101911925A CN102288574A (en) | 2011-07-08 | 2011-07-08 | Device and method for quantitatively analyzing concentration of multi-component oil fume |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103207159A (en) * | 2012-01-12 | 2013-07-17 | 筵丽萍 | Near-infrared spectral measure system and method thereof |
| CN103983602A (en) * | 2014-06-04 | 2014-08-13 | 江南大学 | Infrared oil fume concentration sensor |
| CN104007081A (en) * | 2014-05-29 | 2014-08-27 | 江苏物联网研究发展中心 | Gas detection device, gas detection system and gas detection method |
| CN104697952A (en) * | 2015-03-23 | 2015-06-10 | 山东省科学院海洋仪器仪表研究所 | Device for carrying out concentration detection on variety of gas in seawater |
| CN105628637A (en) * | 2015-12-29 | 2016-06-01 | 山东罗纳德分析仪器有限公司 | Three-reference-channel infrared gas analyzing method and device |
| CN109631118A (en) * | 2018-12-29 | 2019-04-16 | 佛山市云米电器科技有限公司 | A kind of kitchen ventilator that can identify pernicious gas in oil smoke |
| CN109882899A (en) * | 2018-12-29 | 2019-06-14 | 佛山市云米电器科技有限公司 | A kind of kitchen ventilator controlled according to working environment |
| CN113984666A (en) * | 2021-11-17 | 2022-01-28 | 重庆大学 | System and method for detecting concentration of specific component in mixed gas |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103207159A (en) * | 2012-01-12 | 2013-07-17 | 筵丽萍 | Near-infrared spectral measure system and method thereof |
| CN104007081A (en) * | 2014-05-29 | 2014-08-27 | 江苏物联网研究发展中心 | Gas detection device, gas detection system and gas detection method |
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| CN104697952A (en) * | 2015-03-23 | 2015-06-10 | 山东省科学院海洋仪器仪表研究所 | Device for carrying out concentration detection on variety of gas in seawater |
| CN105628637A (en) * | 2015-12-29 | 2016-06-01 | 山东罗纳德分析仪器有限公司 | Three-reference-channel infrared gas analyzing method and device |
| CN105628637B (en) * | 2015-12-29 | 2018-12-04 | 山东罗纳德分析仪器有限公司 | A kind of infrared gas analysis method and apparatus of three reference channels |
| CN109631118A (en) * | 2018-12-29 | 2019-04-16 | 佛山市云米电器科技有限公司 | A kind of kitchen ventilator that can identify pernicious gas in oil smoke |
| CN109882899A (en) * | 2018-12-29 | 2019-06-14 | 佛山市云米电器科技有限公司 | A kind of kitchen ventilator controlled according to working environment |
| CN109882899B (en) * | 2018-12-29 | 2020-08-14 | 佛山市云米电器科技有限公司 | Range hood controlled according to working environment |
| CN113984666A (en) * | 2021-11-17 | 2022-01-28 | 重庆大学 | System and method for detecting concentration of specific component in mixed gas |
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Application publication date: 20111221 |