CN104458630A - Data processing method and system for ultraviolet differential gas analyzer - Google Patents
Data processing method and system for ultraviolet differential gas analyzer Download PDFInfo
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Abstract
The invention discloses a data processing method for an ultraviolet differential gas analyzer. The method comprises the following steps: acquiring dark spectrum data; acquiring source spectrum data of detected gas; performing nonlinear compensation correction on the source spectrum data with the dark spectrum data and the source spectrum data as parameters, thereby obtaining target spectrum data; calculating the pseudo concentration value of the detected gas corresponding to the target spectrum data by a differential optical absorption spectroscopy method; and calculating the concentration value of the detected gas which the pseudo concentration value corresponds to according to a stepped judgment method. On one hand, the method disclosed by the invention can reduce noise effect on a spectrometer brought about by temperature, humidity and the like and ensures the reliability of data, and on the other hand, the method reduces the influence on high concentration gas and low concentration gas brought about by detection environments and improves the detection precision. In addition, the invention further discloses a data processing system for the ultraviolet differential gas analyzer.
Description
Technical field
The present invention relates to difference absorption spectrum technical field, particularly relate to a kind of data processing method and system of ultraviolet difference gas analyzer.
Background technology
Ultraviolet difference gas analyzer is mainly used in the concentration value of measurement gas, is widely used in industry spot and testing agency.The principle of ultraviolet difference gas analyzer utilizes difference absorption spectrum technology.
Difference absorption spectrum technology is a kind of spectrum monitoring technology, its ultimate principle be exactly the narrow-band absorption characteristic of the gas molecule utilized in air to differentiate gas componant, and deduce out the concentration of minimum gas according to narrow-band absorption intensity.
The data processing method of current ultraviolet difference gas analyzer directly adopts the result of calculation of difference absorption spectrum method.But because difference between high concentrations of gas and light concentration gas is very large, therefore, the reliability of the measurement result directly adopting difference absorption spectrum method to obtain is lower, and accuracy is also lower.
Therefore, the accuracy of detection improving ultraviolet difference gas analyzer is those skilled in the art's problem demanding prompt solutions.
Summary of the invention
The object of this invention is to provide a kind of data processing method of ultraviolet difference gas analyzer, for improving the accuracy of detection of ultraviolet difference gas analyzer.In addition, a kind of data handling system of the ultraviolet difference gas analyzer based on the method is also provided.
For solving the problems of the technologies described above, the invention provides a kind of data processing method of ultraviolet difference gas analyzer, comprising:
Obtain half-light modal data;
Obtain the source spectroscopic data of tested gas;
As parameter, nonlinear compensation correction is carried out to described source spectroscopic data using described half-light modal data and described source spectroscopic data, and obtain target optical spectral data;
Difference absorption spectrum method is utilized to calculate the pseudo-concentration value of tested gas corresponding to described target optical spectral data;
The concentration value of tested gas corresponding to described pseudo-concentration value is calculated according to staged determination methods.
Preferably, described nonlinear compensation correction is carried out to described source spectroscopic data, and obtains target optical spectral data and specifically comprise:
Utilize formula x=S
p-D
pobtain the difference of described source spectroscopic data and described half-light modal data,
Wherein, x is difference; S
pfor described source spectroscopic data; D
pfor described half-light modal data;
Described difference and nonlinear compensation correction coefficient is utilized to calculate correction corresponding to described source spectroscopic data;
Utilize formula R
1=R
p+ D
pcalculate the correction result that described source spectroscopic data is corresponding,
Wherein, R
pfor correction; R
1for correction result;
Utilize formula R=α R
1+ β R
2calculate described target optical spectral data.
Wherein, R is target optical spectral data; R
2computing method and R
1computing method identical, R
1and R
2it is the correction result that adjacent twice nonlinear compensation correction obtains; Alpha+beta=1, α > 0 β > 0.
Preferably, described staged determination methods is 2 rank staged determination methods.
Preferably, described 2 rank staged determination methods specifically comprise:
Described difference absorption spectrum method is utilized to calculate the first pseudo-concentration value of the first calibrating gas;
Using the horizontal ordinate of described first pseudo-concentration value as the first comparison point;
Using the ordinate of the first normal concentration value of described first calibrating gas as described first comparison point;
Calculate the first slope of the straight line that described first comparison point and initial point are determined;
Described difference absorption spectrum method is utilized to calculate the second pseudo-concentration value of the second calibrating gas;
Using the horizontal ordinate of described second pseudo-concentration value as the second comparison point;
Using the ordinate of the second normal concentration value of described second calibrating gas as described second comparison point;
Calculate the second slope of the straight line that described second comparison point and described initial point are determined;
Judge whether described pseudo-concentration value is greater than described first pseudo-concentration value;
If described pseudo-concentration value is less than described first pseudo-concentration value, then utilize formula y=k
1× D calculates the concentration value of described tested gas;
If described pseudo-concentration value is greater than described first pseudo-concentration value, then utilize formula y=k
2× D calculates the concentration value of described tested gas;
Wherein, y is the concentration value of described tested gas; k
1for described first slope; k
2for described second slope; D is described pseudo-concentration value.
Preferably, described first normal concentration value is 198ppm, and described second normal concentration value is 400ppm.
A data handling system for ultraviolet difference gas analyzer, comprising:
Half-light Data acquisition unit, for obtaining half-light modal data;
Source spectroscopic data acquiring unit, for obtaining the source spectroscopic data of tested gas;
Amending unit, for carrying out nonlinear compensation correction as parameter to described source spectroscopic data using described half-light modal data and described source spectroscopic data, and obtains target optical spectral data;
Pseudo-concentration value computing unit, for the pseudo-concentration value utilizing difference absorption spectrum method to calculate tested gas corresponding to described target optical spectral data;
Concentration value computing unit, for calculating the concentration value of tested gas corresponding to described pseudo-concentration value according to staged determination methods.
Preferably, described amending unit comprises:
Mathematic interpolation subelement, for utilizing formula x=S
p-D
pobtain the difference of described source spectroscopic data and described half-light modal data,
Wherein, x is difference; S
pfor described source spectroscopic data; D
pfor described half-light modal data;
Correction computation subunit, calculates correction corresponding to described source spectroscopic data for utilizing described difference and nonlinear compensation correction coefficient;
Correction result computation subunit, for utilizing formula R
1=R
p+ D
pcalculate the correction result that described source spectroscopic data is corresponding,
Wherein, R
pfor correction; R
1for correction result;
Ratio corrected Calculation subelement, utilizes formula R=α R
1+ β R
2calculate described target optical spectral data,
Wherein, R is target optical spectral data; R
2computing method and R
1computing method identical, R
1and R
2it is the correction result that adjacent twice nonlinear compensation correction obtains; Alpha+beta=1, α > 0 β > 0.
Preferably, described concentration value computing unit utilizes 2 rank staged determination methods to calculate the concentration value of tested gas corresponding to described pseudo-concentration value.
Preferably, described concentration value computing unit comprises:
First slope calculation unit SCU, for utilize described difference absorption spectrum method calculate the first calibrating gas the first pseudo-concentration value, using described first pseudo-concentration value as the horizontal ordinate of the first comparison point, using the first normal concentration value of described first calibrating gas as the ordinate of described first comparison point and the first slope calculating the straight line that described first comparison point and initial point are determined;
Second slope calculation unit SCU, for utilize described difference absorption spectrum method calculate the second calibrating gas the second pseudo-concentration value, using described second pseudo-concentration value as the horizontal ordinate of the second comparison point, using the second normal concentration value of described second calibrating gas as the ordinate of described second comparison point and the second slope calculating the straight line that described second comparison point and described initial point are determined;
Judging unit, for judging whether described pseudo-concentration value is greater than described first pseudo-concentration value;
Concentration value determining unit, if described pseudo-concentration value is less than described first pseudo-concentration value, then utilizes formula y=k
1× D calculates the concentration value of described tested gas; If described pseudo-concentration value is greater than described first pseudo-concentration value, then utilize formula y=k
2× D calculates the concentration value of described tested gas;
Wherein, y is the concentration value of described tested gas; k
1for described first slope; k
2for described second slope; D is described pseudo-concentration value.
Preferably, described first normal concentration value is 198ppm, and described second normal concentration value is 400ppm.
The data processing method of ultraviolet difference gas analyzer provided by the present invention, first carries out nonlinear compensation correction to the source spectroscopic data of tested gas, obtains target optical spectral data, using the input data of target optical spectral data as difference absorption spectrum method.The noise effect because spectrometer brings by temperature and humidity etc. can be reduced like this, ensure that the reliability of data itself.In addition, again the calculating of staged determination methods is carried out to the concentration value that difference absorption spectrum method calculates, result staged determination methods calculated is as the concentration value of final tested gas, thus the impact reduced because high concentrations of gas and light concentration gas bring because of testing environment, improve accuracy of detection.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention, simple introduction is done below by the accompanying drawing used required in embodiment, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the process flow diagram of the data processing method of a kind of ultraviolet difference gas analyzer provided by the invention;
Fig. 2 is a kind of process flow diagram source spectroscopic data being carried out to nonlinear compensation modification method provided by the invention;
Fig. 3 is the process flow diagram of a kind of 2 rank staged determination methods provided by the invention;
Fig. 4 is the structural drawing of the data handling system of a kind of ultraviolet difference gas analyzer provided by the invention;
Fig. 5 is the structural drawing of a kind of amending unit provided by the invention;
Fig. 6 is the structural drawing of a kind of concentration value computing unit provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not making under creative work prerequisite, and the every other embodiment obtained, all belongs to scope.
Core of the present invention is to provide a kind of data processing method and system of ultraviolet difference gas analyzer.
In order to make those skilled in the art person understand the present invention program better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Embodiment one
Fig. 1 is the process flow diagram of the data processing method of a kind of ultraviolet difference gas analyzer provided by the invention.The data processing method of ultraviolet difference gas analyzer comprises:
S10: obtain half-light modal data;
Half-light spectrum refers to closes light source in testing process, and when not detect gas or gas be nitrogen, the data that spectrometer collection arrives.In concrete enforcement, half-light modal data D
pobtaining when initialization, is an one-dimension array, array size 2048.
S11: the source spectroscopic data obtaining tested gas;
Source spectroscopic data S
pacquisition be in testing environment light source open, its pass into detect gas time, the data that spectrometer collection arrives.When passing into detection gas, one group of absorption spectrum can be obtained, i.e. source spectroscopic data S
p.Wherein, source spectroscopic data S
palso be an one-dimension array, array size is also 2048.
S12: as parameter, nonlinear compensation correction is carried out to described source spectroscopic data using described half-light modal data and described source spectroscopic data, and obtain target optical spectral data;
In concrete enforcement, the nonlinear compensation correction coefficient provided by spectrometer, carries out gamma correction to source spectroscopic data.The gamma correction system provided due to different spectrometers is different, therefore wouldn't illustrate here.
S13: utilize difference absorption spectrum method to calculate the pseudo-concentration value of tested gas corresponding to described target optical spectral data;
The target optical spectral data obtained by step S12 as the input data source of difference absorption spectrum method, then calculates the pseudo-concentration value of tested gas.Here not being why the concentration value of tested gas, but pseudo-concentration value, is because due to the difference of tested gas concentration height, may there are differences, if do not processed the value after measuring, the result precision of calculating is not high.
S14: the concentration value calculating tested gas corresponding to described pseudo-concentration value according to staged determination methods.
In theory, the result calculated through difference absorption spectrum method and tested gas concentration value are linear, i.e. y=k × d.If take single k value, then can not calculate the concentration value of tested gas more accurately, therefore need to adopt stepped judgment mode to calculate for concentration value.
The data processing method of ultraviolet difference gas analyzer provided by the invention, first can carry out nonlinear compensation correction to source spectroscopic data, using the input data of revised target data as difference absorption spectrum method.In addition, then adopt staged determination methods to calculate the result that difference absorption spectrum method calculates, thus improve accuracy of detection.
Fig. 2 is a kind of process flow diagram source spectroscopic data being carried out to nonlinear compensation modification method provided by the invention.As one preferred embodiment, described nonlinear compensation correction is carried out to described source spectroscopic data, and obtains target optical spectral data and specifically comprise:
S20: utilize formula x=S
p-D
pobtain the difference of described source spectroscopic data and described half-light modal data,
Wherein, x is difference; S
pfor described source spectroscopic data; D
pfor described half-light modal data;
S21: utilize described difference and nonlinear compensation correction coefficient to calculate correction corresponding to described source spectroscopic data;
S22: utilize formula R
1=R
p+ D
pcalculate the correction result that described source spectroscopic data is corresponding,
Wherein, R
pfor correction; R
1for correction result;
S23: utilize formula R=α R
1+ β R
2calculate described target optical spectral data.
Wherein, R is target optical spectral data; R
2computing method and R
1computing method identical, R
1and R
2it is the correction result that adjacent twice nonlinear compensation correction obtains; Alpha+beta=1, α > 0 β > 0.
In concrete enforcement, obtaining source spectroscopic data S
pwith described half-light modal data D
pdifference x after, 7 rank coefficients can be selected to carry out correction R
pcalculating.Utilize formula:
F
P＝c
0+c
1x+c
2x
2+c
3x
3+c
4x
4+c
5x
5+c
6x
6+c
7x
7；
R
P＝x/F
P；
Wherein, c
i(i=1,2,3 ..., 7) be nonlinear compensation correction coefficient, F
pfor intermediate variable.
Obtaining correction R
pafter, by correction R
pwith half-light modal data D
paddition obtains correction result R
1.For ensureing the continuity of spectroscopic data, correction result being carried out transformation of scale, namely utilizes formula R=α R
1+ β R
2calculate described target optical spectral data R.Wherein R
2computing method and R
1computing method identical, R
1and R
2it is the correction result that adjacent twice nonlinear compensation correction obtains.
Provided by the inventionly nonlinear compensation modification method is carried out to source spectroscopic data can revise data before utilizing difference absorption spectrum method, improve the reliability of source spectroscopic data.
It should be noted that, the 7 rank Coefficient Algorithm adopted in this optimal way just illustrate, can calculate in other embodiments according to actual conditions.
As one preferred embodiment, described staged determination methods is 2 rank staged determination methods.
According to the actual requirements, choose ladder determination methods, the pseudo-concentration value of the calculating of difference absorption spectrum method can be divided into several intervals.Because the more calculated amount in interval are larger, therefore optimal way of the present invention is employing 2 rank staged determination methods.
Fig. 3 is the process flow diagram of a kind of 2 rank staged determination methods provided by the invention.Described 2 rank staged determination methods specifically comprise:
S30: utilize described difference absorption spectrum method to calculate the first pseudo-concentration value of the first calibrating gas;
S31: using the horizontal ordinate of described first pseudo-concentration value as the first comparison point;
S32: using the ordinate of the first normal concentration value of described first calibrating gas as described first comparison point;
S33: the first slope calculating the straight line that described first comparison point and initial point are determined;
S34: utilize described difference absorption spectrum method to calculate the second pseudo-concentration value of the second calibrating gas;
S35: using the horizontal ordinate of described second pseudo-concentration value as the second comparison point;
S36: using the ordinate of the second normal concentration value of described second calibrating gas as described second comparison point;
S37: the second slope calculating the straight line that described second comparison point and described initial point are determined;
S38: judge whether described pseudo-concentration value is greater than described first pseudo-concentration value;
S39: if described pseudo-concentration value is less than described first pseudo-concentration value, then utilize formula y=k
1× D calculates the concentration value of described tested gas;
S40: if described pseudo-concentration value is greater than described first pseudo-concentration value, then utilize formula y=k
2× D calculates the concentration value of described tested gas;
Wherein, y is the concentration value of described tested gas; k
1for described first slope; k
2for described second slope; D is described pseudo-concentration value.
As one preferred embodiment, described first normal concentration value is 198ppm, and described second normal concentration value is 400ppm.
Utilize difference absorption spectrum method to calculate the concentration of the first calibrating gas, namely the first pseudo-concentration value, is designated as d1, then the coordinate of the first comparison point is (d1,198).Utilize origin (0,0) and the first comparison point (d1,198) to determine straight line, calculate the slope of this straight line, i.e. the first slope k
1.
Same method, utilizes difference absorption spectrum method to calculate the concentration of the second calibrating gas, and namely the first pseudo-concentration value, is designated as d2, then the coordinate of the second comparison point is (d2,400).Utilize origin (0,0) and the second comparison point (d2,400) to determine straight line, calculate the slope of this straight line, i.e. the second slope k
2.
Judge the size of pseudo-concentration value D and d2, if D > is d1, then utilize formula y=k
2× D calculates the concentration value of described tested gas; If D < is d1, then utilize formula y=k
1× D calculates the concentration value of described tested gas.
2 rank staged determination methods provided by the invention set two conversion amounts for high concentration and low concentration two kinds of situations, by judging that the size of pseudo-concentration value is determined to choose which conversion amount as final result of calculation, improve the accuracy of testing result.
What needs were said is, the concentration value choosing the first calibrating gas and the second calibrating gas does not have strict regulation, the impact that the present invention brings to reduce concentration level, the concentration value choosing the first calibrating gas is 198ppm, and the concentration value of the second calibrating gas is 400ppm.Can also be other data in other embodiments.
Embodiment two
Fig. 4 is the structural drawing of the data handling system of a kind of ultraviolet difference gas analyzer provided by the invention.The data handling system of ultraviolet difference gas analyzer, comprising:
Half-light Data acquisition unit 40, for obtaining half-light modal data;
Source spectroscopic data acquiring unit 41, for obtaining the source spectroscopic data of tested gas;
Amending unit 42, for carrying out nonlinear compensation correction as parameter to described source spectroscopic data using described half-light modal data and described source spectroscopic data, and obtains target optical spectral data;
Pseudo-concentration value computing unit 43, for the pseudo-concentration value utilizing difference absorption spectrum method to calculate tested gas corresponding to described target optical spectral data;
Concentration value computing unit 44, for calculating the concentration value of tested gas corresponding to described pseudo-concentration value according to staged determination methods.
Fig. 5 is the structural drawing of a kind of amending unit provided by the invention.Amending unit 42 comprises:
Mathematic interpolation subelement 420, for utilizing formula x=S
p-D
pobtain the difference of described source spectroscopic data and described half-light modal data,
Wherein, x is difference; S
pfor described source spectroscopic data; D
pfor described half-light modal data;
Correction computation subunit 421, calculates correction corresponding to described source spectroscopic data for utilizing described difference and nonlinear compensation correction coefficient;
Correction result computation subunit 422, for utilizing formula R
1=R
p+ D
pcalculate the correction result that described source spectroscopic data is corresponding,
Wherein, R
pfor correction; R
1for correction result;
Ratio corrected Calculation subelement 423, utilizes formula R=α R
1+ β R
2calculate described target optical spectral data;
Wherein, R is target optical spectral data; R
2computing method and R
1computing method identical, R
1and R
2it is the correction result that adjacent twice nonlinear compensation correction obtains; Alpha+beta=1, α > 0 β > 0.
As one preferred embodiment, described concentration value computing unit 44 utilizes 2 rank staged determination methods to calculate the concentration value of tested gas corresponding to described pseudo-concentration value.
Fig. 6 is the structural drawing of a kind of concentration value computing unit provided by the invention.Concentration value computing unit 44 comprises:
First slope calculation unit SCU 440, for utilize described difference absorption spectrum method calculate the first calibrating gas the first pseudo-concentration value, using described first pseudo-concentration value as the horizontal ordinate of the first comparison point, using the first normal concentration value of described first calibrating gas as the ordinate of described first comparison point and the first slope calculating the straight line that described first comparison point and round dot are determined;
Second slope calculation unit SCU 441, for utilize described difference absorption spectrum method calculate the second calibrating gas the second pseudo-concentration value, using described second pseudo-concentration value as the horizontal ordinate of the second comparison point, using the second normal concentration value of described second calibrating gas as the ordinate of described second comparison point and the second slope calculating the straight line that described second comparison point and described round dot are determined;
Judging unit 442, for judging whether described pseudo-concentration value is greater than described first pseudo-concentration value;
Concentration value determining unit 443, if described pseudo-concentration value is less than described first pseudo-concentration value, then utilizes formula y=k
1× D calculates the concentration value of described tested gas; If described pseudo-concentration value is greater than described first pseudo-concentration value, then utilize formula y=k
2× D calculates the concentration value of described tested gas;
Wherein, y is the concentration value of described tested gas; k
1for described first slope; k
2for described second slope; D is described pseudo-concentration value.
As one preferred embodiment, described first normal concentration value is 198ppm, and described second normal concentration value is 400ppm.
Because embodiment two is systems corresponding to the method for embodiment one, concrete embodiment refers to embodiment one, wouldn't repeat here.
Above the data processing method of ultraviolet difference gas analyzer provided by the present invention and system are described in detail.Apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (10)
1. a data processing method for ultraviolet difference gas analyzer, is characterized in that, comprising:
Obtain half-light modal data;
Obtain the source spectroscopic data of tested gas;
As parameter, nonlinear compensation correction is carried out to described source spectroscopic data using described half-light modal data and described source spectroscopic data, and obtain target optical spectral data;
Difference absorption spectrum method is utilized to calculate the pseudo-concentration value of tested gas corresponding to described target optical spectral data;
The concentration value of tested gas corresponding to described pseudo-concentration value is calculated according to staged determination methods.
2. the data processing method of ultraviolet difference gas analyzer according to claim 1, is characterized in that, describedly carries out nonlinear compensation correction to described source spectroscopic data, and obtains target optical spectral data and specifically comprise:
Utilize formula x=S
p-D
pobtain the difference of described source spectroscopic data and described half-light modal data,
Wherein, x is difference; S
pfor described source spectroscopic data; D
pfor described half-light modal data;
Described difference and nonlinear compensation correction coefficient is utilized to calculate correction corresponding to described source spectroscopic data;
Utilize formula R
1=R
p+ D
pcalculate the correction result that described source spectroscopic data is corresponding,
Wherein, R
pfor correction; R
1for correction result;
Utilize formula R=α R
1+ β R
2calculate described target optical spectral data.
Wherein, R is target optical spectral data; R
2computing method and R
1computing method identical, R
1and R
2it is the correction result that adjacent twice nonlinear compensation correction obtains; Alpha+beta=1, α > 0 β > 0.
3. the data processing method of ultraviolet difference gas analyzer according to claim 1, is characterized in that, described staged determination methods is 2 rank staged determination methods.
4. the data processing method of ultraviolet difference gas analyzer according to claim 3, is characterized in that, described 2 rank staged determination methods specifically comprise:
Described difference absorption spectrum method is utilized to calculate the first pseudo-concentration value of the first calibrating gas;
Using the horizontal ordinate of described first pseudo-concentration value as the first comparison point;
Using the ordinate of the first normal concentration value of described first calibrating gas as described first comparison point;
Calculate the first slope of the straight line that described first comparison point and initial point are determined;
Described difference absorption spectrum method is utilized to calculate the second pseudo-concentration value of the second calibrating gas;
Using the horizontal ordinate of described second pseudo-concentration value as the second comparison point;
Using the ordinate of the second normal concentration value of described second calibrating gas as described second comparison point;
Calculate the second slope of the straight line that described second comparison point and described initial point are determined;
Judge whether described pseudo-concentration value is greater than described first pseudo-concentration value;
If described pseudo-concentration value is less than described first pseudo-concentration value, then utilize formula y=k
1× D calculates the concentration value of described tested gas;
If described pseudo-concentration value is greater than described first pseudo-concentration value, then utilize formula y=k
2× D calculates the concentration value of described tested gas;
Wherein, y is the concentration value of described tested gas; k
1for described first slope; k
2for described second slope; D is described pseudo-concentration value.
5. the data processing method of ultraviolet difference gas analyzer according to claim 4, is characterized in that, described first normal concentration value is 198ppm, and described second normal concentration value is 400ppm.
6. a data handling system for ultraviolet difference gas analyzer, is characterized in that, comprising:
Half-light Data acquisition unit, for obtaining half-light modal data;
Source spectroscopic data acquiring unit, for obtaining the source spectroscopic data of tested gas;
Amending unit, for carrying out nonlinear compensation correction as parameter to described source spectroscopic data using described half-light modal data and described source spectroscopic data, and obtains target optical spectral data;
Pseudo-concentration value computing unit, for the pseudo-concentration value utilizing difference absorption spectrum method to calculate tested gas corresponding to described target optical spectral data;
Concentration value computing unit, for calculating the concentration value of tested gas corresponding to described pseudo-concentration value according to staged determination methods.
7. the data handling system of ultraviolet difference gas analyzer according to claim 6, is characterized in that, described amending unit comprises:
Mathematic interpolation subelement, for utilizing formula x=S
p-D
pobtain the difference of described source spectroscopic data and described half-light modal data,
Wherein, x is difference; S
pfor described source spectroscopic data; D
pfor described half-light modal data;
Correction computation subunit, calculates correction corresponding to described source spectroscopic data for utilizing described difference and nonlinear compensation correction coefficient;
Correction result computation subunit, for utilizing formula R
1=R
p+ D
pcalculate the correction result that described source spectroscopic data is corresponding,
Wherein, R
pfor correction; R
1for correction result;
Ratio corrected Calculation subelement, utilizes formula R=α R
1+ β R
2calculate described target optical spectral data,
Wherein, R is target optical spectral data; R
2computing method and R
1computing method identical, R
1and R
2it is the correction result that adjacent twice nonlinear compensation correction obtains; Alpha+beta=1, α > 0 β > 0.
8. the data handling system of ultraviolet difference gas analyzer according to claim 6, is characterized in that, described concentration value computing unit utilizes 2 rank staged determination methods to calculate the concentration value of tested gas corresponding to described pseudo-concentration value.
9. the data handling system of ultraviolet difference gas analyzer according to claim 8, is characterized in that, described concentration value computing unit comprises:
First slope calculation unit SCU, for utilize described difference absorption spectrum method calculate the first calibrating gas the first pseudo-concentration value, using described first pseudo-concentration value as the horizontal ordinate of the first comparison point, using the first normal concentration value of described first calibrating gas as the ordinate of described first comparison point and the first slope calculating the straight line that described first comparison point and initial point are determined;
Second slope calculation unit SCU, for utilize described difference absorption spectrum method calculate the second calibrating gas the second pseudo-concentration value, using described second pseudo-concentration value as the horizontal ordinate of the second comparison point, using the second normal concentration value of described second calibrating gas as the ordinate of described second comparison point and the second slope calculating the straight line that described second comparison point and described initial point are determined;
Judging unit, for judging whether described pseudo-concentration value is greater than described first pseudo-concentration value;
Concentration value determining unit, if described pseudo-concentration value is less than described first pseudo-concentration value, then utilizes formula y=k
1× D calculates the concentration value of described tested gas; If described pseudo-concentration value is greater than described first pseudo-concentration value, then utilize formula y=k
2× D calculates the concentration value of described tested gas;
Wherein, y is the concentration value of described tested gas; k
1for described first slope; k
2for described second slope; D is described pseudo-concentration value.
10. the data handling system of ultraviolet difference gas analyzer according to claim 9, is characterized in that, described first normal concentration value is 198ppm, and described second normal concentration value is 400ppm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105352866A (en) * | 2015-12-14 | 2016-02-24 | 重庆川仪自动化股份有限公司 | Spectroscopic data processing method based on xenon lamp source |
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| CN115128027A (en) * | 2022-07-29 | 2022-09-30 | 中煤科工集团沈阳研究院有限公司 | Ultraviolet differential spectrum gas sensor environment pressure compensation structure and method |
| CN115128027B (en) * | 2022-07-29 | 2023-09-19 | 中煤科工集团沈阳研究院有限公司 | Ultraviolet spectrum-splitting gas sensor environment pressure compensation structure and method |
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