CN117368132A - Malodorous gas detection method and device and computer equipment - Google Patents
Malodorous gas detection method and device and computer equipment Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 33
- 238000002835 absorbance Methods 0.000 claims abstract description 536
- 238000004364 calculation method Methods 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 40
- 239000007789 gas Substances 0.000 claims description 277
- QMMFVYPAHWMCMS-UHFFFAOYSA-N Dimethyl sulfide Chemical compound CSC QMMFVYPAHWMCMS-UHFFFAOYSA-N 0.000 claims description 264
- WQOXQRCZOLPYPM-UHFFFAOYSA-N dimethyl disulfide Chemical compound CSSC WQOXQRCZOLPYPM-UHFFFAOYSA-N 0.000 claims description 204
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 200
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 claims description 194
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 174
- LSDPWZHWYPCBBB-UHFFFAOYSA-N Methanethiol Chemical compound SC LSDPWZHWYPCBBB-UHFFFAOYSA-N 0.000 claims description 154
- GETQZCLCWQTVFV-UHFFFAOYSA-N trimethylamine Chemical compound CN(C)C GETQZCLCWQTVFV-UHFFFAOYSA-N 0.000 claims description 152
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 claims description 117
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims description 117
- 238000001914 filtration Methods 0.000 claims description 78
- 229910021529 ammonia Inorganic materials 0.000 claims description 77
- 238000001228 spectrum Methods 0.000 claims description 34
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 30
- 238000004891 communication Methods 0.000 claims description 18
- QGJOPFRUJISHPQ-NJFSPNSNSA-N carbon disulfide-14c Chemical compound S=[14C]=S QGJOPFRUJISHPQ-NJFSPNSNSA-N 0.000 claims description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- 238000004590 computer program Methods 0.000 claims description 10
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims 1
- 239000005977 Ethylene Substances 0.000 claims 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N o-dimethylbenzene Natural products CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 description 17
- 238000010586 diagram Methods 0.000 description 11
- 238000012544 monitoring process Methods 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 238000000862 absorption spectrum Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000004422 calculation algorithm Methods 0.000 description 3
- -1 humidity Substances 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000002211 ultraviolet spectrum Methods 0.000 description 2
- 206010011409 Cross infection Diseases 0.000 description 1
- 206010029803 Nosocomial infection Diseases 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000004949 mass spectrometry Methods 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000007500 overflow downdraw method Methods 0.000 description 1
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- 238000002798 spectrophotometry method Methods 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005987 sulfurization reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The application discloses a malodorous gas detection method, a malodorous gas detection device and computer equipment, wherein the absorbance data of a gas to be detected is obtained by obtaining standard absorbance data of each gas component in standard malodorous gas, and coefficients of each gas component in the gas to be detected are obtained through multiple piecewise inversion calculation based on the standard absorbance data of each gas component and the absorbance data of the gas to be detected, so that the concentration of each gas component in the gas to be detected is obtained through fitting calculation. The method and the device can effectively eliminate cross interference among the gas components and improve the precision of malodorous gas detection.
Description
Technical Field
The present application relates to the field of environmental sensing technologies, and in particular, to a method and an apparatus for detecting malodorous gas, and a computer device.
Background
Malodorous gases are a generic term for reactive gases that cause discomfort to humans, and are the focus of environmental monitoring. The malodorous emission standard prescribes emission limits of various gas components in malodorous gas, and the monitoring method of malodorous gas is generally defined as methods such as meteorological chromatography, spectrophotometry, mass spectrometry and the like. The malodorous gas generally comprises eight gas components, the concentration of the eight gases can not be measured by one principle or method at the same time, and the conventional electrochemical monitoring malodorous method generally only detects part of the gases, even if the electrochemical monitoring method of eight gases is simultaneously monitored, the technical problem of cross interference of each gas component exists, and the concentration limit value of the eight gases required in the malodorous emission standard is lower, so that the detection standard can not be reached. Or, through the spectral data of the malodorous gas that gathers, inversion is carried out simultaneously to spectral data in same wave band, uses the least square method to acquire the concentration of each gas component simultaneously, but inversion is carried out with same wave band, absorbs near gas and can lead to cross infection, and particulate matter, humidity, oxygen etc. also can absorb in this wave band simultaneously, also can produce the interference.
Disclosure of Invention
The purpose of the application is to provide a malodorous gas detection method, which can effectively separate out each gas component in malodorous gas, effectively eliminate the cross interference among each gas component and improve the accuracy of malodorous gas detection.
Based on the above object, the present application provides a malodorous gas detection method, comprising the steps of:
s1, acquiring standard absorbance data of each gas component in standard malodorous gas;
s2, calculating to obtain first absorbance data of the gas to be detected, and inverting and calculating to obtain coefficients of each gas component in the gas to be detected based on the standard absorbance data and the first absorbance data, wherein the method comprises the following steps:
s21, calculating to obtain coefficients of ammonia and carbon disulfide in the gas to be detected according to first absorbance data corresponding to a first pixel interval and standard absorbance of corresponding ammonia and carbon disulfide, wherein the first pixel interval is 120 th to 145 th pixel points;
s22, subtracting the absorbance of ammonia and carbon disulfide from the first absorbance data to obtain second absorbance data, and calculating to obtain a coefficient of the dimethyl sulfide in the gas to be detected according to the second absorbance data corresponding to a second pixel interval and the standard absorbance of the corresponding dimethyl sulfide, wherein the second pixel interval is the 35 th-75 th pixel point;
S23, subtracting the absorbance of the dimethyl sulfide from the second absorbance data to obtain third absorbance data, and calculating to obtain coefficients of dimethyl disulfide, styrene and hydrogen sulfide according to the third absorbance data corresponding to a third pixel interval and the standard absorbance of the corresponding dimethyl disulfide, styrene and hydrogen sulfide, wherein the third pixel interval is a pixel point 25-110;
s24, subtracting the absorbance of the dimethyl disulfide, the styrene and the hydrogen sulfide from the third absorbance data to obtain fourth absorbance data, and calculating to obtain coefficients of methyl mercaptan and trimethylamine according to the fourth absorbance data corresponding to a fourth pixel interval and the standard absorbance of the corresponding methyl mercaptan and trimethylamine, wherein the fourth pixel interval is 60-160 pixels;
s3, fitting calculation is carried out according to the coefficient of each gas component in the gas to be measured, so that the concentration of each gas component in the gas to be measured is obtained.
Further, step S1 includes:
collecting and acquiring standard spectrums of methyl mercaptan, dimethyl sulfide, dimethyl disulfide, hydrogen sulfide, trimethylamine, ammonia gas, carbon disulfide and styrene and spectrums of nitrogen, and calculating to obtain standard absorbance data H as follows:
；
wherein,represents the standard absorbance,/-for the n-th pixel methyl mercaptan >Represents the standard absorbance,/-for the n-th pixel point of dimethyl sulfide>Standard absorbance of dimethyl disulfide representing nth pixel, +.>Represents the standard absorbance of hydrogen sulfide at the nth pixel point,/->Represents the standard absorbance of trimethylamine at the nth pixel,>represents the standard absorbance of ammonia gas of the nth pixel point, < >>Represents the standard absorbance, < +.A > of the carbon disulfide at the nth pixel point>Representing the standard absorbance of styrene at the nth pixel point;
the step S2 comprises the following steps:
according to the spectrum of the gas to be measured and the spectrum of the nitrogen, calculating to obtain first absorbance data M of the gas to be measured 1 The method comprises the following steps:
；
wherein alpha is n The absorbance of the gas to be measured at the nth pixel point is represented,is nitrogen spectrum, N 1 Is the spectrum of the gas to be measured.
Further, step S21 includes:
performing fifth-order fitting filtering on the absorbance of a first pixel interval in the first absorbance data, wherein the filtered absorbance data is expressed as M 11 Carrying out five-order fitting filtering on the standard absorbance corresponding to the ammonia gas and the carbon disulfide in the first pixel interval in the standard absorbance data respectively, and calculating to obtain the coefficient of the ammonia gas and the coefficient of the carbon disulfide in the gas to be detected, wherein the calculation formula is as follows:
；
wherein,data of standard absorbance of 120 th-145 th pixel point of ammonia after fifth order fitting filtering, +. >B, carrying out fifth-order fitting filtering on the standard absorbance of the 120 th-145 th pixel point of carbon disulfide 120 ~b 145 The data of the first absorbance data of the 120 th to 145 th pixel points after the fifth order fitting and filtering are +.>Is the ammonia coefficient>Is the coefficient of carbon disulphide.
Further, step S22 includes:
first absorbance data M 1 Subtracting the absorbance of ammonia and carbon disulfide to obtain second absorbance data M 2 The method comprises the following steps:
；
wherein,is the standard absorbance of ammonia gas,/>Is the standard absorbance of hydrogen sulfide;
for the second absorbance data M 2 The absorbance of the second pixel interval in the middle is subjected to sixth-order fitting filtering, and the filtered absorbance data is expressed as M 21 And carrying out six-order fitting filtering on the standard absorbance corresponding to the dimethyl sulfide in the second pixel interval in the standard absorbance data, and calculating to obtain the coefficient of the dimethyl sulfide in the gas to be detected, wherein the calculation formula is as follows:
；
wherein,b is data of standard absorbance of 35 th-75 th pixel points of the dimethyl sulfide after sixth-order fitting filtering 35 ~b 75 The second absorbance data of the 35 th to 75 th pixel points are subjected to sixth order fitting and filtering, and the data is +.>Is the coefficient of dimethyl sulfide.
Further, step S23 includes:
second absorbance data M 2 Subtracting the absorbance of the dimethyl sulfide to obtain third absorbance data M 3 The method comprises the following steps:
；
wherein,standard absorbance for dimethyl sulfide;
for the third absorbance data M 3 The absorbance of the third pixel interval is subjected to third-order fitting filtering, and the filtered absorbance data is expressed as M 31 And respectively corresponding to the dimethyl disulfide in the third pixel interval in the standard absorbance data,Carrying out third-order fitting filtering on the standard absorbance of the styrene and the hydrogen sulfide, and calculating to obtain coefficients of dimethyl disulfide, the styrene and the hydrogen sulfide in the gas to be detected, wherein the calculation formula is as follows:
；
wherein,data of standard absorbance of 25 th to 110 th pixel points of dimethyl disulfide subjected to third order fitting filtering are +.>Is the data of standard absorbance of 25 th-110 th pixel point of styrene after third order fitting and filtering,/second order fitting and filtering>B is data of standard absorbance of 25 th-110 th pixel points of hydrogen sulfide after third-order fitting filtering 25 ~b 110 Third absorbance data of the 25 th to 110 th pixel points are subjected to third order fitting and filtering, and the data is +.>Is the coefficient of dimethyl disulfide, +.>Is the coefficient of styrene, +.>Is the coefficient of hydrogen sulfide.
Further, step S24 includes:
data M of third absorbance 3 Subtracting the absorbance of dimethyl disulfide, hydrogen sulfide and styrene to obtain fourth absorbance data M 4 The method comprises the following steps:
；
wherein, Is the standard absorbance of dimethyl disulfide, +.>Is the standard absorbance of styrene, < >>Is the standard absorbance of hydrogen sulfide;
fourth absorbance data M 4 The absorbance of the fourth pixel interval is M 41 And combining the standard absorbance data corresponding to the methyl mercaptan and the trimethylamine in the fourth pixel interval to calculate and obtain coefficients of the methyl mercaptan and the trimethylamine in the gas to be detected, wherein the calculation formula is as follows:
；
wherein,is the standard absorbance of 60 th to 160 th pixel points of methyl mercaptan,standard absorbance of 60 th to 160 th pixel point of trimethylamine, b 60 ~b 160 The absorbance of 60 th to 160 th pixel points in the fourth absorbance data is +.>Is the coefficient of methyl mercaptan,/>Is the coefficient of trimethylamine.
Further, step S3 includes:
respectively introducing gases to be measured with different concentration gradients in full scale range, and performing three-order nonlinear curve fitting on each gas component according to the coefficients of each gas component in the gases to be measured and the standard concentration values corresponding to each gas component in a standard database, wherein the concentration value C of each gas component after nonlinear fitting i And for C i Proceeding with a stepConcentration y of each gas component in the gas to be measured by the step linear fitting i Wherein, the calculation formula is:
；
；
；
Wherein i=1, 2,3,4,5,6,7,8, respectively represent methyl mercaptan, methyl sulfide, dimethyl disulfide, hydrogen sulfide, trimethylamine, ammonia, carbon disulfide, styrene, k i Corresponding to coefficients of methyl mercaptan, dimethyl sulfide, dimethyl disulfide, hydrogen sulfide, trimethylamine, ammonia, carbon disulfide and styrene in the gas to be detected, R i Corresponding to standard concentration values of methyl mercaptan, dimethyl sulfide, dimethyl disulfide, hydrogen sulfide, trimethylamine, ammonia, carbon disulfide and styrene in standard absorbance data, and l i 、w i 、m 1i 、m 2i 、m 3i 、d i Representing the fitting constant.
Based on the above object, the present application provides a malodorous gas detection method, comprising the steps of:
s71, acquiring standard absorbance data of each gas component in standard malodorous gas;
s72, calculating to obtain first absorbance data of the gas to be detected, and inverting and calculating to obtain coefficients of each gas component in the gas to be detected based on the standard absorbance data and the first absorbance data, wherein the method comprises the following steps:
s721, calculating to obtain coefficients of ammonia and carbon disulfide in the gas to be detected according to the first absorbance data corresponding to the fifth pixel interval and the standard absorbance of the corresponding ammonia and carbon disulfide, wherein the fifth pixel interval is the 90 th to 130 th pixel points;
s722, subtracting the absorbance of ammonia and carbon disulfide from the first absorbance data to obtain fifth absorbance data, and calculating to obtain coefficients of dimethyl sulfide and styrene according to the fifth absorbance data corresponding to a sixth pixel interval and the standard absorbance of corresponding dimethyl sulfide and styrene, wherein the sixth pixel interval is 100 th to 170 th pixel points;
S723, subtracting the absorbance of the dimethyl sulfide and the styrene from the fifth absorbance data to obtain sixth absorbance data, and calculating to obtain coefficients of dimethyl disulfide and hydrogen sulfide according to the sixth absorbance data corresponding to a seventh pixel interval and the standard absorbance of the corresponding dimethyl disulfide and hydrogen sulfide, wherein the seventh pixel interval is the 30 th to 130 th pixel points;
s724, subtracting the absorbance of the dimethyl disulfide and the hydrogen sulfide from the sixth absorbance data to obtain seventh absorbance data, and calculating to obtain coefficients of methyl mercaptan and trimethylamine according to the seventh absorbance data corresponding to an eighth pixel interval and the standard absorbance of the corresponding methyl mercaptan and trimethylamine, wherein the eighth pixel interval is the 50 th to 180 th pixel point;
s73, fitting calculation is carried out according to the coefficient of each gas component in the gas to be measured, so as to obtain the concentration of each gas component in the gas to be measured.
Based on the above object, the present application provides a malodorous gas detection device comprising:
the standard absorbance data module is used for acquiring standard absorbance data of each gas component in the standard malodorous gas;
the coefficient inversion module is used for calculating to obtain first absorbance data of the gas to be detected, inverting the coefficient of each gas component in the gas to be detected based on the standard absorbance data and the first absorbance data, and the coefficient inversion module comprises:
The first inversion unit is used for calculating and obtaining coefficients of ammonia and carbon disulfide in the gas to be detected according to first absorbance data corresponding to a first pixel interval and standard absorbance of the corresponding ammonia and carbon disulfide, wherein the first pixel interval is 120 th to 145 th pixel points;
the second inversion unit is used for subtracting the absorbance of ammonia and carbon disulfide from the first absorbance data to obtain second absorbance data, and calculating to obtain a coefficient of the methyl sulfide according to the second absorbance data corresponding to a second pixel interval and the standard absorbance of the corresponding methyl sulfide, wherein the second pixel interval is the 35 th-75 th pixel point;
the third reflection unit is used for subtracting the absorbance of the dimethyl sulfide from the second absorbance data to obtain third absorbance data, and calculating to obtain coefficients of dimethyl disulfide, styrene and hydrogen sulfide according to the third absorbance data corresponding to a third pixel interval and the standard absorbance of the corresponding dimethyl disulfide, styrene and hydrogen sulfide, wherein the third pixel interval is a pixel point 25-110;
the fourth inversion unit is used for subtracting the absorbance of the dimethyl disulfide, the styrene and the hydrogen sulfide from the third absorbance data to obtain fourth absorbance data, and calculating to obtain coefficients of methyl mercaptan and trimethylamine according to the fourth absorbance data corresponding to a fourth pixel interval and the standard absorbance of the corresponding methyl mercaptan and trimethylamine, wherein the fourth pixel interval is 60-160 pixels;
The concentration calculation module is used for obtaining the coefficients of the gas components in the gas to be measured according to calculation, and fitting calculation is carried out to obtain the concentration of the gas components in the gas to be measured.
Based on the above object, the present application provides a computer device comprising:
comprising the following steps: the device comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are communicated with each other through the communication bus;
a memory for storing a computer program;
a processor for implementing the steps of the method as described above when executing the computer program stored on the memory.
According to the method and the device, each gas component in the malodorous gas can be effectively separated, the concentration of each gas component is obtained through multiple piecewise inversion calculation, cross interference among the gas components can be effectively avoided, the accuracy of concentration detection of each gas component is ensured, and therefore the accuracy of malodorous gas detection is improved.
Drawings
Fig. 1 is a first flowchart of a malodorous gas detection method provided according to an embodiment of the present application;
FIG. 2 is a schematic diagram of absorbance graph data of the same wave band of each component gas of the gas to be measured according to the embodiment of the present application;
fig. 3 is a schematic diagram of absorbance data of a mixed gas in a gas to be measured according to an embodiment of the present application;
Fig. 4 is a schematic diagram of absorbance data after filter fitting of a first pixel interval in the first absorbance data provided according to the embodiment of the application;
fig. 5 is a schematic diagram of absorbance data after filter fitting of a second pixel interval in second absorbance data provided according to an embodiment of the application;
fig. 6 is a schematic diagram of absorbance data after filter fitting of a third pixel interval in third absorbance data provided according to an embodiment of the application;
fig. 7 is a second flowchart of a malodorous gas detection method provided according to an embodiment of the present application;
fig. 8 is a system block diagram of a malodorous gas detection device provided according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a computer device according to an embodiment of the present application.
Detailed Description
The present application will be described in detail with reference to the specific embodiments shown in the drawings, but these embodiments are not limited to the present application, and structural, method, or functional changes made by those skilled in the art according to these embodiments are included in the protection scope of the present application.
Referring to fig. 1, a flowchart of a malodorous gas detection method provided in an embodiment of the present application includes:
s1, acquiring standard absorbance data of each gas component in standard malodorous gas.
And obtaining a standard spectrum of each gas component in the standard malodorous gas and obtaining a nitrogen spectrum, and calculating to obtain standard absorbance data of each gas component, wherein the gas components comprise methyl mercaptan, methyl sulfide, dimethyl disulfide, hydrogen sulfide, trimethylamine, ammonia, carbon disulfide and styrene, and the standard absorbance data comprise standard absorbance of each pixel point corresponding to each gas component.
And acquiring spectrum data of the malodorous gas by an ultraviolet spectrum malodor detection device. The ultraviolet spectrum malodor detection device generally comprises a measuring cell, a deep ultraviolet light source, a deep ultraviolet spectrometer and a computer. In addition to ultraviolet light, there is a region of shorter wavelength, higher frequency, known as extreme ultraviolet or deep ultraviolet, the deep ultraviolet region containing the 100-200nm band. Malodorous gases generally include methyl mercaptan, dimethyl sulfide, dimethyl disulfide, hydrogen sulfide, trimethylamine, ammonia, carbon disulfide, styrene. The zero gas is typically nitrogen. The concentration of each gas component in the standard malodorous gas is known, and the standard absorbance data is obtained by performing spectrum analysis on the standard malodorous gas with the known gas component concentration. Standard malodorous gases with different known concentrations are collected through a deep ultraviolet spectrometer, standard spectrums of methyl mercaptan, dimethyl sulfide, dimethyl disulfide, hydrogen sulfide, trimethylamine, ammonia, carbon disulfide and styrene with different known concentrations are respectively obtained, and spectrums of nitrogen are collected and obtained through the deep ultraviolet spectrometer. Illustratively, the technical scheme of ultraviolet absorption spectrum is adopted, based on Beer-Lambert law, the characteristic absorption spectrum of each gas component in malodorous gas in deep ultraviolet band is utilized, and the intensity of the absorption spectrum is utilized to invert the concentration of the gas. The acquisition of spectral data is a common technical means in the art and will not be described in detail herein.
According to the standard spectrum of methyl mercaptan, methyl sulfide, dimethyl disulfide, hydrogen sulfide, trimethylamine, ammonia, carbon disulfide and styrene and the spectrum of nitrogen, the standard absorbance data H is calculated as follows:
；
wherein,represents the standard absorbance,/-for the n-th pixel methyl mercaptan>Represents the standard absorbance,/-for the n-th pixel point of dimethyl sulfide>Standard absorbance of dimethyl disulfide representing nth pixel, +.>Represents the standard absorbance of hydrogen sulfide at the nth pixel point,/->Represents the standard absorbance of trimethylamine at the nth pixel,>represents the standard absorbance of ammonia gas of the nth pixel point, < >>Represents the standard absorbance, < +.A > of the carbon disulfide at the nth pixel point>The standard absorbance of styrene at the nth pixel point is shown.
Illustratively, the standard absorbance of the gas is calculated according to the standard spectrum of methyl mercaptan, dimethyl sulfide, dimethyl disulfide, hydrogen sulfide, trimethylamine, ammonia, carbon disulfide and styrene and the spectrum of nitrogen, and the concentration value corresponding to the spectrum of methyl mercaptan, dimethyl sulfide, dimethyl disulfide, hydrogen sulfide, trimethylamine, ammonia, carbon disulfide and styrene is obtained by processing the spectrum data. Taking methyl mercaptan as an example, methyl mercaptan absorbance The expression of (2) is:
；
wherein,spectrum of nitrogen, +.>Is the standard spectrum of methyl mercaptan.
Taking this as an example, the standard absorbance of methyl mercaptan, methyl sulfide, dimethyl disulfide, hydrogen sulfide, trimethylamine, ammonia gas, carbon disulfide, styrene is sequentially calculated, thereby obtaining standard absorbance data H.
S2, calculating to obtain first absorbance data of the gas to be detected, and carrying out inversion calculation based on the standard absorbance data and the first absorbance data to obtain coefficients of each gas component in the gas to be detected, wherein the first absorbance data comprises absorbance data of the gas to be detected corresponding to each pixel point.
And irradiating the gas to be detected by using a deep ultraviolet spectrometer to obtain the spectrum of the gas to be detected. Illustratively, a standard spectrum of the gas under test is obtained. According to the spectrum of the gas to be measured and the spectrum of the nitrogen, calculating to obtain first absorbance data M of the gas to be measured 1 The method comprises the following steps:
；
wherein alpha is n The absorbance of the gas to be measured at the nth pixel point is represented,is nitrogen spectrum, N 1 Is the spectrum of the gas to be measured.
The coefficient I of each gas component in the gas to be detected can be obtained by inversion calculation by utilizing the absorbance of the gas to be detected and the standard absorbance data H, namely:
；
；
wherein k is i Sequentially representing coefficients of methyl mercaptan, dimethyl sulfide, dimethyl disulfide, hydrogen sulfide, trimethylamine, ammonia, carbon disulfide and styrene, and obtaining the concentration of each gas component according to the calculated coefficients. However, in the calculation of the formula, inversion is performed on all the gas components in the same wave band, and the similar gas components exist The large cross interference is shown as a light absorption diagram data schematic diagram of the same wave band of each component gas of the gas to be detected shown in fig. 2, inversion is carried out on the same wave band, particles, humidity, oxygen and the like in the air are absorbed in the wave band, interference can be generated on inverted gas components, and absorbance data of mixed gas in the gas to be detected shown in fig. 3 are shown, so that coefficients of each gas component are obtained by means of multi-time piecewise inversion calculation. The inversion step is described in detail below.
S21, calculating to obtain coefficients of ammonia and carbon disulfide in the gas to be detected according to first absorbance data corresponding to a first pixel interval and standard absorbance of corresponding ammonia and carbon disulfide, wherein the first pixel interval is the 120 th to 145 th pixel points.
And calculating to obtain coefficients of ammonia and carbon disulfide in the gas to be detected according to the absorbance of a first pixel interval in the first absorbance data and the standard absorbance of the standard absorbance data corresponding to the ammonia and the carbon disulfide in the first pixel interval, wherein the first pixel interval is the 120 th to 145 th pixel point. In the inversion calculation process, in the interval section of the pixel points 120-145 in the first absorbance data, after the fitting and filtering of dimethyl sulfide, dimethyl disulfide, trimethylamine, hydrogen sulfide, methyl mercaptan and styrene, the absorption is basically not carried out, and ammonia and carbon disulfide are obviously absorbed, as shown in the absorbance data schematic diagram of the first pixel interval filtering and fitting in the first absorbance data in fig. 4, the coefficients of ammonia and carbon disulfide are inverted in the interval section of the pixel points 120-145. Performing fifth-order fitting filtering on the absorbance of a first pixel interval in the first absorbance data, wherein the filtered absorbance data is expressed as M 11 Carrying out five-order fitting filtering on the standard absorbance corresponding to the ammonia gas and the carbon disulfide in the first pixel interval in the standard absorbance data respectively, and calculating to obtain the coefficient of the ammonia gas and the coefficient of the carbon disulfide in the gas to be detected, wherein the calculation formula is as follows:
；
wherein,data of standard absorbance of 120 th-145 th pixel point of ammonia after fifth order fitting filtering, +.>B, carrying out fifth-order fitting filtering on the standard absorbance of the 120 th-145 th pixel point of carbon disulfide 120 ~b 145 The data of the first absorbance data of the 120 th to 145 th pixel points after the fifth order fitting and filtering are +.>Is the ammonia coefficient>Is the coefficient of carbon disulphide. After five-order fitting filtering is carried out on the pixel points 120-145 in the first absorbance data, the absorption interference of water, particulate matters, oxygen, dimethyl sulfide, dimethyl disulfide, trimethylamine, hydrogen sulfide and styrene in the air can be effectively removed, and only the absorption of ammonia and hydrogen sulfide is reserved, so that the interference of incoherent gas in the air can be effectively removed, and the coefficients of ammonia and hydrogen sulfide can be obtained.
S22, subtracting the absorbance of ammonia and carbon disulfide from the first absorbance data to obtain second absorbance data, and calculating to obtain a coefficient of the dimethyl sulfide according to the second absorbance data corresponding to a second pixel interval and the standard absorbance of the corresponding dimethyl sulfide, wherein the second pixel interval is the 35 th-75 th pixel point.
Subtracting the absorbance of ammonia and carbon disulfide from the first absorbance data to obtain second absorbance data, and calculating to obtain the coefficient of the dimethyl sulfide in the gas to be detected according to the absorbance of a second pixel interval in the second absorbance data and the standard absorbance of the dimethyl sulfide corresponding to the second pixel interval in the standard absorbance data, wherein the second pixel interval is the 35 th-75 th pixel point. According to the obtained ammonia and hydrogen sulfide coefficients, the ratio of ammonia and hydrogen sulfide in the gas to be detected can be obtained, so that the product of the ammonia and hydrogen sulfide coefficients and the standard absorbance of ammonia and hydrogen sulfide is subtracted from the first absorbance of the gas to be detected to obtain the condition that no ammonia and hydrogen sulfide are absorbedAbsorbance of the collected gas to be measured. Thus, the first absorbance data M 1 Subtracting the absorbance of ammonia and carbon disulfide to obtain second absorbance data M 2 The method comprises the following steps:
；
wherein,is the standard absorbance of ammonia gas,/>Is the standard absorbance of hydrogen sulfide.
In the interval section of the pixel points 35-75 in the second absorbance data, after the methyl mercaptan, the dimethyl disulfide, the hydrogen sulfide, the trimethylamine and the styrene are subjected to fitting filtering, the gas absorbance is basically not generated, and only the absorption of the methyl sulfide is generated, as shown in the absorbance data schematic diagram of the second pixel interval filtering fitting in the second absorbance data in fig. 5, so that the coefficient of the methyl sulfide is inverted in the interval section of the pixel points 35-75. For the second absorbance data M 2 The absorbance of the second pixel interval in the middle is subjected to sixth-order fitting filtering, and the filtered absorbance data is expressed as M 21 And carrying out six-order fitting filtering on the standard absorbance corresponding to the dimethyl sulfide in the second pixel interval in the standard absorbance data, and calculating to obtain the coefficient of the dimethyl sulfide in the gas to be detected, wherein the calculation formula is as follows:
；
wherein,b is data of standard absorbance of 35 th-75 th pixel points of the dimethyl sulfide after sixth-order fitting filtering 35 ~b 75 The second absorbance data of the 35 th to 75 th pixel points are subjected to sixth order fitting and filtering, and the data is +.>Is the coefficient of dimethyl sulfide.After six-order fitting filtering is carried out on the pixel points 35-75 in the second absorbance data, the absorption interference of methyl mercaptan, dimethyl disulfide, hydrogen sulfide, trimethylamine and styrene can be effectively removed, only the absorption of methyl sulfide is reserved, and the coefficient of the methyl sulfide can be obtained.
S23, subtracting the absorbance of the dimethyl sulfide from the second absorbance data to obtain third absorbance data, and calculating to obtain coefficients of dimethyl disulfide, styrene and hydrogen sulfide according to the third absorbance data corresponding to a third pixel interval and the standard absorbance of the corresponding dimethyl disulfide, styrene and hydrogen sulfide, wherein the third pixel interval is a pixel point 25-110.
And subtracting the absorbance of the dimethyl sulfide from the second absorbance data to obtain third absorbance data, and calculating to obtain coefficients of dimethyl disulfide, styrene and hydrogen sulfide in the gas to be detected according to the absorbance of a third pixel section in the third absorbance data and the standard absorbance of dimethyl disulfide, styrene and hydrogen sulfide in the corresponding third pixel section in the standard absorbance data, wherein the third pixel section is a pixel point 25-110. According to the coefficient of the dimethyl sulfide obtained in the steps, namely the duty ratio of the dimethyl sulfide in the gas to be detected can be obtained, so that the product of the coefficient of the dimethyl sulfide and the standard absorbance of the dimethyl sulfide is subtracted from the second absorbance of the gas to be detected to obtain the absorbance of the gas to be detected without the absorption of the dimethyl sulfide. Thus, the second absorbance data M 2 Subtracting the absorbance of the dimethyl sulfide to obtain third absorbance data M 3 The method comprises the following steps:
；
wherein,is the standard absorbance of dimethyl sulfide.
In the interval of pixel points 25-110 in the third absorbance data, after fitting and filtering, the gas absorbance is basically not generated by methyl mercaptan hydrogen and trimethylamine, and only the absorbance of dimethyl disulfide, styrene and hydrogen sulfide is generated, as shown in the absorbance data of the third pixel interval filtering and fitting in the third absorbance data in fig. 6 The coefficients of dimethyl disulfide, styrene and hydrogen sulfide are thus inverted at the interval of pixels 25-110. For the third absorbance data M 3 The absorbance of the third pixel interval is subjected to third-order fitting filtering, and the filtered absorbance data is expressed as M 31 And respectively carrying out third-order fitting filtering on the standard absorbance corresponding to the dimethyl disulfide, the styrene and the hydrogen sulfide in the third pixel interval in the standard absorbance data, and calculating to obtain coefficients of the dimethyl disulfide, the styrene and the hydrogen sulfide in the gas to be detected, wherein the calculation formula is as follows:
；
wherein,data of standard absorbance of 25 th to 110 th pixel points of dimethyl disulfide subjected to third order fitting filtering are +.>Is the data of standard absorbance of 25 th-110 th pixel point of styrene after third order fitting and filtering,/second order fitting and filtering>B is data of standard absorbance of 25 th-110 th pixel points of hydrogen sulfide after third-order fitting filtering 25 ~b 110 Third absorbance data of the 25 th to 110 th pixel points are subjected to third order fitting and filtering, and the data is +.>Is the coefficient of dimethyl disulfide, +.>Is the coefficient of styrene, +.>Is the coefficient of hydrogen sulfide. After the third order fitting filtering is carried out on the pixel points 35-75 in the third absorbance data, the absorption interference of methyl mercaptan hydrogen and trimethylamine can be effectively removed, and only dimethyl disulfide, styrene and sulfuration are reserved The absorption of hydrogen can obtain the coefficients of dimethyl disulfide, hydrogen sulfide and styrene.
S24, subtracting the absorbance of the dimethyl disulfide, the absorbance of the styrene and the absorbance of the hydrogen sulfide from the third absorbance data to obtain fourth absorbance data, and calculating to obtain coefficients of methyl mercaptan and trimethylamine according to the fourth absorbance data corresponding to a fourth pixel interval and the standard absorbance of the corresponding methyl mercaptan and trimethylamine, wherein the fourth pixel interval is a pixel point 60-160.
And subtracting the absorbance of the dimethyl disulfide, the styrene and the hydrogen sulfide from the third absorbance data to obtain fourth absorbance data, and calculating coefficients of methyl mercaptan and trimethylamine in the gas to be detected according to the absorbance of a fourth pixel interval in the fourth absorbance data and the standard absorbance of methyl mercaptan and trimethylamine in the standard absorbance data corresponding to the fourth pixel interval, wherein the fourth pixel interval is 60-160 pixels. The coefficients of dimethyl disulfide, hydrogen sulfide and styrene which are obtained according to the steps above, namely the ratio of dimethyl disulfide, hydrogen sulfide and styrene in the gas to be tested can be obtained, so that the product of the coefficients of dimethyl disulfide, hydrogen sulfide and styrene and the standard absorbance of dimethyl disulfide, hydrogen sulfide and styrene is subtracted from the third absorbance of the gas to be tested to obtain the absorbance of the gas to be tested without the absorption of dimethyl disulfide, hydrogen sulfide and styrene. Thus, the third absorbance data M 3 Subtracting the absorbance of dimethyl disulfide, hydrogen sulfide and styrene to obtain fourth absorbance data M 4 The method comprises the following steps:
；
wherein,is the standard absorbance of dimethyl disulfide, +.>Is the standard absorbance of styrene, < >>Is the standard absorbance of hydrogen sulfide.
In the fourth absorbance data, the interval of the pixel points 60-160 has better absorption of methyl mercaptan and trimethylamine, so that the coefficients of methyl mercaptan and trimethylamine are inverted in the interval of the pixel points 60-160. Fourth absorbance data M 4 The absorbance of the fourth pixel interval is M 41 And combining the standard absorbance of the methyl mercaptan and the trimethylamine corresponding to the fourth pixel interval in the standard absorbance data, and calculating to obtain coefficients of the methyl mercaptan and the trimethylamine in the gas to be detected, wherein the calculation formula is as follows:
；
wherein,is the standard absorbance of 60 th to 160 th pixel points of methyl mercaptan,standard absorbance of 60 th to 160 th pixel point of trimethylamine, b 60 ~b 160 The absorbance of 60 th to 160 th pixel points in the fourth absorbance data is +.>Is the coefficient of methyl mercaptan,/>Is the coefficient of trimethylamine. And obtaining coefficients of methyl mercaptan and trimethylamine by performing third-order fitting filtering on the pixel points 60-160 in the fourth absorbance data.
According to the technical scheme, the absorbance data of the gas to be detected can be subjected to multi-stage filtering algorithm processing, so that the duty ratio coefficients of methyl mercaptan, methyl sulfide, dimethyl disulfide, hydrogen sulfide, trimethylamine, ammonia, carbon disulfide and styrene in the gas to be detected can be obtained, cross interference among gas components can be effectively avoided, the accuracy of concentration detection of the gas components is ensured, and the accuracy of malodorous gas detection is improved.
S4, fitting calculation is carried out according to the coefficient of each gas component in the gas to be measured, so that the concentration of each gas component in the gas to be measured is obtained.
Respectively introducing gases to be measured with different concentration gradients in full scale range, and performing three-order nonlinear curve fitting on each gas component according to the coefficients of each gas component in the gases to be measured and the standard concentration values corresponding to each gas component in a standard database, wherein the concentration value C of each gas component after nonlinear fitting i And for C i Concentration y of each gas component in the gas to be measured for first order linear fitting i Wherein, the calculation formula is:
；
；
；
wherein i=1, 2,3,4,5,6,7,8, respectively represent methyl mercaptan, methyl sulfide, dimethyl disulfide, hydrogen sulfide, trimethylamine, ammonia, carbon disulfide, styrene, k i Corresponding to coefficients of methyl mercaptan, dimethyl sulfide, dimethyl disulfide, hydrogen sulfide, trimethylamine, ammonia, carbon disulfide and styrene in the gas to be detected, R i Corresponding to standard concentration values of methyl mercaptan, dimethyl sulfide, dimethyl disulfide, hydrogen sulfide, trimethylamine, ammonia, carbon disulfide and styrene in standard absorbance data, and l i 、w i 、m 1i 、m 2i 、m 3i 、d i Representing the fitting constant.
Illustratively, 5 groups of gases to be measured with different gradients in a full scale range of 100%, 80%, 50%, 30% and 20% are introduced, concentration measurement values of each gas component are obtained according to a concentration inversion algorithm, and curve fitting is carried out on the concentration measurement values and standard concentration values.
According to the technical scheme for obtaining the concentration of each gas component in malodorous gas by the segment multiple multi-order filtering algorithm, in practical application, the inversion sequence of each gas component, the inversion wave band, the filtering order and the like can be adjusted according to specific requirements, and another embodiment is provided. Referring to fig. 7, a flowchart of a malodorous gas detection method provided in an embodiment of the present application includes:
s71, acquiring standard absorbance data of each gas component in standard malodorous gas;
s72, calculating to obtain first absorbance data of the gas to be detected, and inverting and calculating to obtain coefficients of each gas component in the gas to be detected based on the standard absorbance data and the first absorbance data, wherein the method comprises the following steps:
the implementation of the above steps is the same as that of the first embodiment, and will not be described here again.
S721, calculating to obtain coefficients of ammonia and carbon disulfide in the gas to be detected according to the first absorbance data corresponding to the fifth pixel interval and the standard absorbance of the corresponding ammonia and carbon disulfide, wherein the fifth pixel interval is the 90 th to 130 th pixel points.
And calculating to obtain coefficients of ammonia and carbon disulfide in the gas to be detected according to the absorbance of a fifth pixel interval in the first absorbance data and the standard absorbance of ammonia and carbon disulfide in the standard absorbance data corresponding to the fifth pixel interval, wherein the fifth pixel interval is the 90 th to 130 th pixel point. In the inversion calculation process, in the interval of pixel points 90-130 in the first absorbance data, methyl mercaptan, methyl sulfide, dimethyl disulfide, trimethylamine, hydrogen sulfide and styrene are basically not absorbed after fitting and filtering, and ammonia and carbon disulfide are obviously absorbed, so that the coefficients of ammonia and carbon disulfide are inverted in the interval of pixel points 90-130. Performing seven-order fitting filtering on the absorbance of the fifth pixel interval in the first absorbance data, wherein the filtered absorbance data is expressed as S 01 Seven-order fitting filtering is carried out on the standard absorbance corresponding to the ammonia gas and the carbon disulfide in the fifth pixel interval in the standard absorbance data respectively, the coefficient of the ammonia gas and the coefficient of the carbon disulfide in the gas to be detected are obtained through calculation, and the calculation formula is as follows:
；
wherein,data of standard absorbance data of 90 th to 130 th pixel points of ammonia gas subjected to seven-order fitting filtering,/I>C, carrying out seven-order fitting filtering on standard absorbance data of the 90 th-130 th pixel points of carbon disulfide 90 ~c 130 The data of the first absorbance data of the 90 th to 130 th pixel points are subjected to seven-order fitting filtering,is the ammonia coefficient>Is the coefficient of carbon disulphide.
S722, subtracting the absorbance of ammonia and carbon disulfide from the first absorbance data to obtain fifth absorbance data, and calculating to obtain coefficients of the dimethyl sulfide and the styrene according to the fifth absorbance data corresponding to a sixth pixel interval and the standard absorbance of the corresponding dimethyl sulfide and the styrene, wherein the sixth pixel interval is 100 th to 170 th pixel points.
And subtracting the absorbance of the ammonia gas and the carbon disulfide from the first absorbance data to obtain fifth absorbance data, and calculating to obtain coefficients of the dimethyl sulfide and the styrene in the gas to be detected according to the absorbance of a sixth pixel interval in the fifth absorbance data and the standard absorbance of the dimethyl sulfide and the styrene in the standard absorbance interval, wherein the sixth pixel interval is 100 th to 170 th pixel points. According to the obtained ammonia and hydrogen sulfide coefficients, namely the ratio of the ammonia and the hydrogen sulfide in the gas to be detected, the product of the ammonia and hydrogen sulfide coefficients and the standard absorbance of the ammonia and the hydrogen sulfide is subtracted from the first absorbance of the gas to be detected, so that the absorbance of the gas to be detected without ammonia and hydrogen sulfide absorption is obtained. Thus, the first absorbance data M 1 Subtracting the absorbance of ammonia and carbon disulfide to obtain a fifth absorbanceData S 1 The method comprises the following steps:
；
wherein,is the standard absorbance of ammonia gas,/>Is the standard absorbance of hydrogen sulfide.
In the fifth absorbance data, in the interval of 100-170 of the pixel points, after the methyl mercaptan, the dimethyl disulfide, the hydrogen sulfide and the trimethylamine are subjected to fitting filtration, the gas absorbance is basically not, and only the absorption of the methyl sulfide and the styrene is carried out, so that the coefficients of the methyl sulfide and the styrene are inverted in the interval of 100-170 of the pixel points. For the fifth absorbance data S 1 The absorbance of the sixth pixel interval is subjected to third-order fitting filtering, and the filtered absorbance data is expressed as S 11 And carrying out third-order fitting filtering on the standard absorbance corresponding to the dimethyl sulfide and the styrene in the sixth pixel interval in the standard absorbance data, and calculating to obtain coefficients of the dimethyl sulfide and the styrene in the gas to be detected, wherein the calculation formula is as follows:
；
wherein,is the data of standard absorbance data of 100 th to 170 th pixel points of the dimethyl sulfide after third order fitting and filtering>C is data obtained by performing third-order fitting filtering on standard absorbance data of 100 th-170 th pixel points of styrene 100 ~c 170 Data of third order fitting filtering of fifth absorbance data of 100-170 th pixels,/for the fifth absorbance data >Is the coefficient of dimethyl sulfide,/>Is the coefficient of styrene.
S723, subtracting the absorbance of the dimethyl sulfide and the styrene from the fifth absorbance data to obtain sixth absorbance data, and calculating to obtain coefficients of dimethyl disulfide and hydrogen sulfide according to the sixth absorbance data corresponding to a seventh pixel interval and the standard absorbance of the corresponding dimethyl disulfide and hydrogen sulfide, wherein the seventh pixel interval is the 30 th to 130 th pixel points.
And subtracting the absorbance of the dimethyl sulfide and the styrene from the fifth absorbance data to obtain sixth absorbance data, and calculating to obtain coefficients of the dimethyl disulfide and the hydrogen sulfide in the gas to be detected according to the absorbance of a seventh pixel interval in the sixth absorbance data and the standard absorbance of the dimethyl disulfide and the hydrogen sulfide in the corresponding seventh pixel interval in the standard absorbance data, wherein the seventh pixel interval is the 30 th to 130 th pixel point. According to the obtained coefficients of the dimethyl sulfide and the styrene, namely the ratio of the dimethyl sulfide to the styrene in the gas to be detected can be obtained, so that the product of the coefficients of the dimethyl sulfide and the styrene and the standard absorbance of the dimethyl sulfide and the styrene is subtracted from the fifth absorbance of the gas to be detected to obtain the absorbance of the gas to be detected without the absorption of the dimethyl sulfide and the styrene. Thus, the fifth absorbance data S is obtained 1 Subtracting the absorbance of the dimethyl sulfide and the absorbance of the styrene to obtain sixth absorbance data S 2 The method comprises the following steps:
；
wherein,is the standard absorbance of dimethyl sulfide,/-, for>Is the standard absorbance of styrene.
In the sixth absorbance data, the interval of pixel points 30-130 is that the absorbance of the gas is basically not higher after the methyl mercaptan and the trimethylamine are subjected to fitting filtrationThere is only absorption of dimethyl disulfide and hydrogen sulfide, and therefore the coefficients of dimethyl disulfide and hydrogen sulfide are inverted in the interval of pixel points 30-130. For the sixth absorbance data S 2 The absorbance of the seventh pixel interval is subjected to third-order fitting filtering, and the filtered absorbance data is expressed as S 21 And performing third-order fitting filtering on the standard absorbance corresponding to the dimethyl disulfide and hydrogen sulfide in the seventh pixel interval in the standard absorbance data, and calculating to obtain coefficients of the dimethyl disulfide and the hydrogen sulfide in the gas to be detected, wherein the calculation formula is as follows:
；
wherein,data of standard absorbance data of 30 th to 130 th pixel points of dimethyl disulfide after third order fitting filtering are +.>C, performing third-order fitting filtering on standard absorbance data of 30 th-130 th pixel points of hydrogen sulfide 30 ~c 130 The data of the sixth absorbance data of the 30 th to 130 th pixel points after third order fitting and filtering are +. >Is the coefficient of dimethyl disulfide, +.>Is the coefficient of hydrogen sulfide.
S724, subtracting the absorbance of the dimethyl disulfide and the hydrogen sulfide from the sixth absorbance data to obtain seventh absorbance data, and calculating to obtain coefficients of methyl mercaptan and trimethylamine according to the seventh absorbance data corresponding to the eighth pixel interval and the standard absorbance of the corresponding methyl mercaptan and trimethylamine, wherein the eighth pixel interval is the 50 th to 180 th pixel points.
Subtracting the absorbance of the dimethyl disulfide and hydrogen sulfide from the sixth absorbance data to obtain seventh absorbance data, and determining an eighth pixel region in the seventh absorbance dataAnd calculating the coefficients of methyl mercaptan and trimethylamine in the gas to be detected according to the absorbance of the gas and the standard absorbance corresponding to the methyl mercaptan and trimethylamine in an eighth pixel interval in the standard absorbance data, wherein the eighth pixel interval is the 50 th-180 th pixel point. According to the obtained coefficients of dimethyl disulfide and hydrogen sulfide in the steps, namely the ratio of the dimethyl disulfide to the hydrogen sulfide in the gas to be detected can be obtained, so that the product of the coefficient of the dimethyl disulfide and the hydrogen sulfide and the standard absorbance of the dimethyl disulfide and the hydrogen sulfide is subtracted from the third six absorbance of the gas to be detected to obtain the absorbance of the gas to be detected without the absorption of the dimethyl disulfide and the hydrogen sulfide. Thus, sixth absorbance data S is obtained 2 Subtracting the absorbance of dimethyl disulfide and hydrogen sulfide to obtain seventh absorbance data S 3 The method comprises the following steps:
；
wherein,is the standard absorbance of dimethyl disulfide, +.>Is the standard absorbance of hydrogen sulfide.
In the seventh absorbance data, the interval of the pixel points 50-180 is better in absorption of methyl mercaptan and trimethylamine, so that coefficients of methyl mercaptan and trimethylamine are inverted in the interval of the pixel points 50-180. For the seventh absorbance data S 3 Absorbance of the eighth pixel section is S 31 And combining the standard absorbance of the methyl mercaptan and the trimethylamine in the eighth pixel interval in the standard absorbance data, and calculating to obtain coefficients of the methyl mercaptan and the trimethylamine in the gas to be detected, wherein the calculation formula is as follows:
；
wherein,50 th to 180 th image of methyl mercaptanSixth absorbance data of the pixel points,standard absorbance data for 50 th to 180 th pixel of trimethylamine, c 50 ~c 180 Seventh absorbance data for 50 th to 180 th pixel,>is the coefficient of methyl mercaptan,/>Is the coefficient of trimethylamine.
S73, fitting calculation is carried out according to the coefficient of each gas component in the gas to be measured, so as to obtain the concentration of each gas component in the gas to be measured.
The implementation manner of this step is consistent with that of the foregoing embodiment, and will not be described in detail.
As shown in fig. 8, the present application further provides a malodorous gas detection device, which includes:
The standard absorbance data module 81 is configured to obtain a standard spectrum of each gas component in the standard malodorous gas and obtain a nitrogen spectrum, and calculate to obtain standard absorbance data of each gas component, where the gas components include methyl mercaptan, dimethyl sulfide, dimethyl disulfide, hydrogen sulfide, trimethylamine, ammonia, carbon disulfide, and styrene, and the standard absorbance data includes standard absorbance of each pixel point corresponding to each gas component;
the coefficient inversion module 82 is configured to obtain a spectrum of the gas to be measured, calculate first absorbance data of the gas to be measured, and perform inversion calculation based on the standard absorbance data and the first absorbance data to obtain coefficients of each gas component in the gas to be measured, where the first absorbance data includes absorbance data of the gas to be measured corresponding to each pixel point, and the coefficient inversion module includes:
the first inversion unit 821 is configured to calculate coefficients of ammonia and carbon disulfide in the gas to be measured according to first absorbance data corresponding to a first pixel interval, and standard absorbance of corresponding ammonia and carbon disulfide, where the first pixel interval is the 120 th to 145 th pixel points;
the second inversion unit 822 is configured to subtract the absorbance of ammonia and carbon disulfide from the first absorbance data to obtain second absorbance data, and calculate a coefficient of dimethyl sulfide according to the second absorbance data corresponding to the second pixel interval and the standard absorbance of corresponding dimethyl sulfide, where the second pixel interval is the 35 th-75 th pixel point;
A third reflection unit 823, configured to subtract the absorbance of the dimethyl sulfide from the second absorbance data to obtain third absorbance data, and calculate coefficients of dimethyl disulfide, styrene, and hydrogen sulfide according to the third absorbance data corresponding to a third pixel interval, where the third pixel interval is a pixel point 25-110;
a fourth inversion unit 824, configured to subtract the absorbance of the dimethyl disulfide, the styrene, and the hydrogen sulfide from the third absorbance data to obtain fourth absorbance data, and calculate coefficients of methyl mercaptan and trimethylamine according to the fourth absorbance data corresponding to the fourth pixel interval and the standard absorbance of the corresponding methyl mercaptan and trimethylamine, where the fourth pixel interval is 60-160 pixels;
the concentration calculation module 83 is configured to perform fitting calculation to obtain the concentration of each gas component in the gas to be measured according to the coefficient of each gas component in the gas to be measured obtained by calculation.
Fig. 9 is a schematic hardware structure of a computer device according to an embodiment of the present application. The computer device shown in fig. 9 includes: the processor 91, the communication interface 92, the memory 93 and the communication bus 94, and the processor 91, the communication interface 92 and the memory 93 communicate with each other through the communication bus 94. The connection manner between the processor 91, the communication interface 92, and the memory 93 shown in fig. 9 is merely exemplary, and in the implementation process, the processor 91, the communication interface 92, and the memory 93 may be communicatively connected to each other by other connection manners besides the communication bus 94.
The memory 93 may be used to store a computer program 931, and the computer program 931 may include instructions and data to implement the steps of the data fusion method, the target detection method, as in any of the above. In the present embodiment, the memory 93 may be various types of storage media such as random access memory (random access memory, RAM), read Only Memory (ROM), nonvolatile RAM (NVRAM), programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (electrical erasablePROM, EEPROM), flash memory, optical memory, registers, and the like. The storage 94 may include a hard disk and/or memory.
The processor 91 may be a general-purpose processor, which may be a processor that performs certain steps and/or operations by reading and executing a computer program (e.g., computer program 931) stored in a memory (e.g., memory 93), which may use data stored in the memory (e.g., memory 93) during execution of the steps and/or operations.
The communication interface 92 may include an input/output (I/O) interface, a physical interface, a logical interface, and the like for realizing interconnection of devices inside the network device, and an interface for realizing interconnection of the network device with other devices (e.g., network device). The communication network may be an ethernet, a radio access network (radio access network, RAN), a wireless local area network (wireless local areanetworks, WLAN), etc. The communication interface 92 may be a module, circuit, transceiver, or any device capable of communicating.
In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in the processor 91 or by instructions in the form of software. The method disclosed in connection with the embodiments of the present application may be embodied directly in hardware processor execution or in a combination of hardware and software modules in a processor. The software modules may be located in a random access memory flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. Which is located in a memory 93 and the processor 91 reads information in the memory 93 and in connection with its hardware performs the steps of the above-described method. To avoid repetition, a detailed description is not provided herein.
The embodiment of the application also provides a computer readable storage medium, wherein a computer program is stored in the computer readable storage medium, and when the computer program is executed by a processor, the method for detecting the malodorous gas is realized.
Although the preferred embodiments of the present application have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the application as disclosed in the accompanying claims.
Claims (10)
1. A malodorous gas detection method, characterized in that the method comprises the steps of:
s1, acquiring standard absorbance data of each gas component in standard malodorous gas;
s2, calculating to obtain first absorbance data of the gas to be detected, and inverting and calculating to obtain coefficients of each gas component in the gas to be detected based on the standard absorbance data and the first absorbance data, wherein the method comprises the following steps:
s21, calculating to obtain coefficients of ammonia and carbon disulfide in the gas to be detected according to first absorbance data corresponding to a first pixel interval and standard absorbance of corresponding ammonia and carbon disulfide, wherein the first pixel interval is 120 th to 145 th pixel points;
S22, subtracting the absorbance of ammonia and carbon disulfide from the first absorbance data to obtain second absorbance data, and calculating to obtain a coefficient of the methyl sulfide according to the second absorbance data corresponding to a second pixel interval and the standard absorbance of the corresponding methyl sulfide, wherein the second pixel interval is the 35 th-75 th pixel point;
s23, subtracting the absorbance of the dimethyl sulfide from the second absorbance data to obtain third absorbance data, and calculating to obtain coefficients of dimethyl disulfide, styrene and hydrogen sulfide according to the third absorbance data corresponding to a third pixel interval and the standard absorbance of the corresponding dimethyl disulfide, styrene and hydrogen sulfide, wherein the third pixel interval is a pixel point 25-110;
s24, subtracting the absorbance of the dimethyl disulfide, the styrene and the hydrogen sulfide from the third absorbance data to obtain fourth absorbance data, and calculating to obtain coefficients of methyl mercaptan and trimethylamine according to the fourth absorbance data corresponding to a fourth pixel interval and the standard absorbance of the corresponding methyl mercaptan and trimethylamine, wherein the fourth pixel interval is 60-160 pixels;
s3, fitting calculation is carried out according to the coefficient of each gas component in the gas to be measured, so that the concentration of each gas component in the gas to be measured is obtained.
2. The malodorous gas detection method according to claim 1, wherein the step S1 comprises:
collecting and acquiring standard spectrums of methyl mercaptan, dimethyl sulfide, dimethyl disulfide, hydrogen sulfide, trimethylamine, ammonia gas, carbon disulfide and styrene and spectrums of nitrogen, and calculating to obtain standard absorbance data H as follows:
；
wherein,represents the standard absorbance,/-for the n-th pixel methyl mercaptan>Represents the standard absorbance,/-for the n-th pixel point of dimethyl sulfide>Standard absorbance of dimethyl disulfide representing nth pixel, +.>Represents the standard absorbance of hydrogen sulfide at the nth pixel point,/->Represents the standard absorbance of trimethylamine at the nth pixel,>represents the standard absorbance of ammonia gas of the nth pixel point, < >>Represents the standard absorbance, < +.A > of the carbon disulfide at the nth pixel point>Representing the standard absorbance of styrene at the nth pixel point;
the step S2 includes:
according to the spectrum of the gas to be measured and the spectrum of the nitrogen, calculating to obtain first absorbance data M of the gas to be measured 1 The method comprises the following steps:
；
wherein alpha is n The absorbance of the gas to be measured at the nth pixel point is represented,is nitrogen spectrum, N 1 Is the spectrum of the gas to be measured.
3. The malodorous gas detection method according to claim 2, wherein the step S21 comprises:
Performing fifth-order fitting filtering on the absorbance of the first pixel section in the first absorbance data, wherein the filtered absorbance data is expressed as M 11 Respectively carrying out five-order fitting filtering on the standard absorbance corresponding to the ammonia gas and the carbon disulfide in the first pixel interval in the standard absorbance data, and calculating to obtain the gas to be detectedThe calculation formula of the ammonia gas coefficient and the carbon disulfide coefficient is as follows:
；
wherein,data of standard absorbance of 120 th-145 th pixel point of ammonia after fifth order fitting filtering, +.>B, carrying out fifth-order fitting filtering on the standard absorbance of the 120 th-145 th pixel point of carbon disulfide 120 ~b 145 The data of the first absorbance data of the 120 th to 145 th pixel points after the fifth order fitting and filtering are +.>Is the ammonia coefficient>Is the coefficient of carbon disulphide.
4. The malodorous gas detection method according to claim 3, wherein the step S22 comprises:
first absorbance data M 1 Subtracting the absorbance of ammonia and carbon disulfide to obtain second absorbance data M 2 The method comprises the following steps:
；
wherein,is the standard absorbance of ammonia gas,/>Is the standard absorbance of hydrogen sulfide;
for the second absorbance data M 2 The absorbance of the second pixel interval in the middle is subjected to sixth-order fitting filtering, and the filtered absorbance data is expressed as M 21 And carrying out six-order fitting filtering on the standard absorbance corresponding to the dimethyl sulfide in the second pixel interval in the standard absorbance data, and calculating to obtain the coefficient of the dimethyl sulfide in the gas to be detected, wherein the calculation formula is as follows:
；
wherein,b is data of standard absorbance of 35 th-75 th pixel points of the dimethyl sulfide after sixth-order fitting filtering 35 ~b 75 The second absorbance data of the 35 th to 75 th pixel points are subjected to sixth order fitting and filtering, and the data is +.>Is the coefficient of dimethyl sulfide.
5. The malodorous gas detection method according to claim 4, wherein the step S23 comprises:
second absorbance data M 2 Subtracting the absorbance of the dimethyl sulfide to obtain third absorbance data M 3 The method comprises the following steps:
；
wherein,standard absorbance for dimethyl sulfide;
for the third absorbance data M 3 The absorbance of the third pixel interval is subjected to third-order fitting filtering, and the filtered absorbance data is expressed as M 31 And respectively corresponding to the dimethyl disulfide and benzene in the third pixel interval in the standard absorbance dataCarrying out third-order fitting filtering on the standard absorbance of ethylene and hydrogen sulfide, and calculating to obtain coefficients of dimethyl disulfide, styrene and hydrogen sulfide in the gas to be detected, wherein the calculation formula is as follows:
；
wherein,data of standard absorbance of 25 th to 110 th pixel points of dimethyl disulfide subjected to third order fitting filtering are +. >Is the data of standard absorbance of 25 th-110 th pixel point of styrene after third order fitting and filtering,/second order fitting and filtering>B is data of standard absorbance of 25 th-110 th pixel points of hydrogen sulfide after third-order fitting filtering 25 ~b 110 Third absorbance data of the 25 th to 110 th pixel points are subjected to third order fitting and filtering, and the data is +.>Is the coefficient of dimethyl disulfide, +.>Is the coefficient of styrene, +.>Is the coefficient of hydrogen sulfide.
6. The malodorous gas detection method according to claim 5, wherein the step S24 comprises:
data M of third absorbance 3 Subtracting the absorbance of dimethyl disulfide, hydrogen sulfide and styrene to obtain fourth absorbance data M 4 The method comprises the following steps:
；
wherein,is the standard absorbance of dimethyl disulfide, +.>Is the standard absorbance of styrene, < >>Is the standard absorbance of hydrogen sulfide;
fourth absorbance data M 4 The absorbance of the fourth pixel interval is M 41 And combining the standard absorbance data corresponding to the methyl mercaptan and the trimethylamine in the fourth pixel interval to calculate and obtain coefficients of the methyl mercaptan and the trimethylamine in the gas to be detected, wherein the calculation formula is as follows:
；
wherein,standard absorbance of 60-160 pixels for methyl mercaptan, +.>Standard absorbance of 60 th to 160 th pixel point of trimethylamine, b 60 ~b 160 The absorbance of 60 th to 160 th pixel points in the fourth absorbance data is +.>Is the coefficient of methyl mercaptan,/>Is the coefficient of trimethylamine.
7. The malodorous gas detection method according to claim 6, wherein the step S3 comprises:
respectively introducing gases to be measured with different concentration gradients in full scale range, and performing three-order nonlinear curve fitting on each gas component according to the coefficients of each gas component in the gases to be measured and the standard concentration values corresponding to each gas component in a standard database, wherein the concentration value C of each gas component after nonlinear fitting i And for C i Concentration y of each gas component in the gas to be measured for first order linear fitting i Wherein, the calculation formula is:
；
；
；
wherein i=1, 2,3,4,5,6,7,8, respectively represent methyl mercaptan, methyl sulfide, dimethyl disulfide, hydrogen sulfide, trimethylamine, ammonia, carbon disulfide, styrene, k i Corresponding to coefficients of methyl mercaptan, dimethyl sulfide, dimethyl disulfide, hydrogen sulfide, trimethylamine, ammonia, carbon disulfide and styrene in the gas to be detected, R i Corresponding to standard concentration values of methyl mercaptan, dimethyl sulfide, dimethyl disulfide, hydrogen sulfide, trimethylamine, ammonia, carbon disulfide and styrene in standard absorbance data, and l i 、w i 、m 1i 、m 2i 、m 3i 、d i Representing the fitting constant.
8. A malodorous gas detection method, characterized in that the method comprises the steps of:
s71, acquiring standard absorbance data of each gas component in standard malodorous gas;
s72, calculating to obtain first absorbance data of the gas to be detected, and inverting and calculating to obtain coefficients of each gas component in the gas to be detected based on the standard absorbance data and the first absorbance data, wherein the coefficients comprise:
s721, calculating to obtain coefficients of ammonia and carbon disulfide in the gas to be detected according to first absorbance data corresponding to a fifth pixel interval and standard absorbance of the corresponding ammonia and carbon disulfide, wherein the fifth pixel interval is the 90 th to 130 th pixel points;
s722, subtracting the absorbance of ammonia and carbon disulfide from the first absorbance data to obtain fifth absorbance data, and calculating to obtain coefficients of dimethyl sulfide and styrene according to the fifth absorbance data corresponding to a sixth pixel interval and the standard absorbance of corresponding dimethyl sulfide and styrene, wherein the sixth pixel interval is 100 th to 170 th pixel points;
s723, subtracting the absorbance of the dimethyl sulfide and the absorbance of the styrene from the fifth absorbance data to obtain sixth absorbance data, and calculating to obtain coefficients of dimethyl disulfide and hydrogen sulfide according to the sixth absorbance data corresponding to a seventh pixel interval and the standard absorbance of the corresponding dimethyl disulfide and hydrogen sulfide, wherein the seventh pixel interval is the 30 th to 130 th pixel points;
S724, subtracting the absorbance of the dimethyl disulfide and the hydrogen sulfide from the sixth absorbance data to obtain seventh absorbance data, and calculating to obtain coefficients of methyl mercaptan and trimethylamine according to the seventh absorbance data corresponding to an eighth pixel interval and the standard absorbance of the corresponding methyl mercaptan and trimethylamine, wherein the eighth pixel interval is the 50 th to 180 th pixel points;
s73, fitting calculation is carried out according to the coefficient of each gas component in the gas to be measured, so as to obtain the concentration of each gas component in the gas to be measured.
9. A malodorous gas detection device, the device comprising:
the standard absorbance data module is used for acquiring standard absorbance data of each gas component in the standard malodorous gas;
the coefficient inversion module is used for calculating to obtain first absorbance data of the gas to be detected, and inverting the coefficient of each gas component in the gas to be detected based on the standard absorbance data and the first absorbance data, and comprises:
the first inversion unit is used for calculating and obtaining coefficients of ammonia and carbon disulfide in the gas to be detected according to first absorbance data corresponding to a first pixel interval and standard absorbance of the corresponding ammonia and carbon disulfide, wherein the first pixel interval is 120 th to 145 th pixel points;
The second inversion unit is used for subtracting the absorbance of ammonia and carbon disulfide from the first absorbance data to obtain second absorbance data, and calculating to obtain the coefficient of the dimethyl sulfide according to the second absorbance data corresponding to a second pixel interval and the standard absorbance of the corresponding dimethyl sulfide, wherein the second pixel interval is the 35 th-75 th pixel point;
the third reflection unit is used for subtracting the absorbance of the dimethyl sulfide from the second absorbance data to obtain third absorbance data, and calculating to obtain coefficients of dimethyl disulfide, styrene and hydrogen sulfide according to the third absorbance data corresponding to a third pixel interval and the standard absorbance of the corresponding dimethyl disulfide, styrene and hydrogen sulfide, wherein the third pixel interval is a pixel point 25-110;
the fourth inversion unit is used for subtracting the absorbance of the dimethyl disulfide, the styrene and the hydrogen sulfide from the third absorbance data to obtain fourth absorbance data, and calculating to obtain coefficients of methyl mercaptan and trimethylamine according to the fourth absorbance data corresponding to a fourth pixel interval and the standard absorbance of the corresponding methyl mercaptan and trimethylamine, wherein the fourth pixel interval is 60-160 pixels;
the concentration calculation module is used for obtaining the coefficients of the gas components in the gas to be measured according to calculation, and fitting calculation is carried out to obtain the concentration of the gas components in the gas to be measured.
10. A computer device, characterized in that,
comprising the following steps: the device comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are communicated with each other through the communication bus;
the memory is used for storing a computer program;
the processor being adapted to carry out the steps of the method according to any one of claims 1-8 when executing the computer program stored on the memory.
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