CN104458630B - A kind of data processing method and system of ultraviolet difference gas analyzer - Google Patents
A kind of data processing method and system of ultraviolet difference gas analyzer Download PDFInfo
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Abstract
The invention discloses a kind of data processing method of ultraviolet difference gas analyzer, including：Obtain half-light modal data；Obtain the source spectroscopic data of tested gas；Nonlinear compensation amendment is carried out to the source spectroscopic data using the half-light modal data and the source spectroscopic data as parameter, and obtains target optical spectral data；The pseudo- concentration value of the corresponding tested gas of the target optical spectral data is calculated using difference absorption spectrum method；The concentration value of the corresponding tested gas of the pseudo- concentration value is calculated according to staged determination methods.On the one hand this method can be reduced due to the influence of noise that spectrometer is brought by temperature and humidity etc., it is ensured that the reliability of data in itself.On the other hand, reduce due to the influence that high concentrations of gas and light concentration gas are brought by detection environment, improve accuracy of detection.In addition, invention additionally discloses a kind of data handling system of ultraviolet difference gas analyzer.
Description
Technical field
The present invention relates to difference absorption spectrum technical field, more particularly to a kind of data of ultraviolet difference gas analyzer
Processing method and system.
Background technology
Ultraviolet difference gas analyzer is mainly used in measuring the concentration value of gas, is widely used in industry spot and detection machine
In structure.The principle of ultraviolet difference gas analyzer is to utilize difference absorption spectrum technology.
Difference absorption spectrum technology is a kind of spectrum monitoring technology, and its general principle is exactly to utilize the gas molecule in air
Narrow-band absorption characteristic differentiate gas componant, and deduce out according to narrow-band absorption intensity the concentration of minimum gas.
The data processing method of current ultraviolet difference gas analyzer directly uses the calculating of difference absorption spectrum method
As a result.But it is due to that difference is very big between high concentrations of gas and light concentration gas, therefore, directly using difference absorption spectrum method
The reliability of obtained measurement result is relatively low, and accuracy is relatively low.
Therefore, the accuracy of detection for improving ultraviolet difference gas analyzer is those skilled in the art's urgent problem to be solved.
The content of the invention
It is an object of the invention to provide a kind of data processing method of ultraviolet difference gas analyzer, for improving ultraviolet difference
Divide the accuracy of detection of gas analyzer.In addition, also providing at a kind of data of the ultraviolet difference gas analyzer based on this method
Reason system.
In order to solve the above technical problems, the present invention provides a kind of data processing method of ultraviolet difference gas analyzer, bag
Include：
Obtain half-light modal data；
Obtain the source spectroscopic data of tested gas；
Non-linear mend is carried out to the source spectroscopic data using the half-light modal data and the source spectroscopic data as parameter
Amendment is repaid, and obtains target optical spectral data；
The pseudo- concentration value of the corresponding tested gas of the target optical spectral data is calculated using difference absorption spectrum method；
The concentration value of the corresponding tested gas of the pseudo- concentration value is calculated according to staged determination methods.
It is preferred that, it is described that nonlinear compensation amendment is carried out to the source spectroscopic data, and it is specific to obtain target optical spectral data
Including：
Utilize formula x=SP-DPThe difference of the source spectroscopic data and the half-light modal data is obtained,
Wherein, x is difference；SPFor the source spectroscopic data；DPFor the half-light modal data；
The corresponding correction of the source spectroscopic data is calculated using the difference and nonlinear compensation correction coefficient；
Utilize formula R1=RP+DPThe corresponding correction result of the source spectroscopic data is calculated,
Wherein, RPFor correction；R1For correction result；
Utilize formula R=α R1+βR2Calculate the target optical spectral data.
Wherein, R is target optical spectral data；R2Computational methods and R1Computational methods it is identical, R1And R2It is adjacent non-twice
The correction result that linear compensation amendment is obtained；Alpha+beta=1, α ＞ 0, β ＞ 0.
It is preferred that, the staged determination methods are 2 rank staged determination methods.
It is preferred that, the 2 rank staged determination methods are specifically included：
The first pseudo- concentration value of the first calibrating gas is calculated using the difference absorption spectrum method；
Using the described first pseudo- concentration value as the first comparison point abscissa；
Using the first the standard density of first calibrating gas as first comparison point ordinate；
Calculate the first slope for the straight line that first comparison point is determined with origin；
The second pseudo- concentration value of the second calibrating gas is calculated using the difference absorption spectrum method；
Using the described second pseudo- concentration value as the second comparison point abscissa；
Using the second the standard density of second calibrating gas as second comparison point ordinate；
Calculate the second slope of the straight line that second comparison point is determined with the origin；
Judge whether the pseudo- concentration value is more than the described first pseudo- concentration value；
If the pseudo- concentration value is less than the described first pseudo- concentration value, formula y=k is utilized1× D calculates the tested gas
Concentration value；
If the pseudo- concentration value is more than the described first pseudo- concentration value, formula y=k is utilized2× D calculates the tested gas
Concentration value；
Wherein, y is the concentration value of the tested gas；k1For the first slope；k2For second slope；D is described
Pseudo- concentration value.
It is preferred that, first the standard density is 198ppm, and second the standard density is 400ppm.
A kind of data handling system of ultraviolet difference gas analyzer, including：
Half-light Data acquisition unit, for obtaining half-light modal data；
Source spectroscopic data acquiring unit, the source spectroscopic data for obtaining tested gas；
Amending unit, for using the half-light modal data and the source spectroscopic data as parameter to the source spectroscopic data
Nonlinear compensation amendment is carried out, and obtains target optical spectral data；
Pseudo- concentration value computing unit, for calculating the corresponding quilt of the target optical spectral data using difference absorption spectrum method
Survey the pseudo- concentration value of gas；
Concentration value computing unit, for calculating the corresponding tested gas of the pseudo- concentration value according to staged determination methods
Concentration value.
It is preferred that, the amending unit includes：
Mathematic interpolation subelement, for utilizing formula x=SP-DPObtain the source spectroscopic data and the half-light modal data
Difference,
Wherein, x is difference；SPFor the source spectroscopic data；DPFor the half-light modal data；
Correction computation subunit, for calculating the source spectrum number using the difference and nonlinear compensation correction coefficient
According to corresponding correction；
Correction result computation subunit, for utilizing formula R1=RP+DPCalculate the corresponding amendment knot of the source spectroscopic data
Really,
Wherein, RPFor correction；R1For correction result；
Ratio corrected Calculation subelement, utilizes formula R=α R1+βR2The target optical spectral data is calculated,
Wherein, R is target optical spectral data；R2Computational methods and R1Computational methods it is identical, R1And R2It is adjacent non-twice
The correction result that linear compensation amendment is obtained；Alpha+beta=1, α ＞ 0, β ＞ 0.
It is preferred that, it is corresponding that the concentration value computing unit calculates the pseudo- concentration value using 2 rank staged determination methods
The concentration value of tested gas.
It is preferred that, the concentration value computing unit includes：
First slope computing unit, the first puppet for calculating the first calibrating gas using the difference absorption spectrum method
Concentration value, using the described first pseudo- abscissa of the concentration value as the first comparison point, the first standard by first calibrating gas
The first of the straight line that concentration value is determined as the ordinate and calculating first comparison point of first comparison point with origin is oblique
Rate；
Second slope calculation unit SCU, the second puppet for calculating the second calibrating gas using the difference absorption spectrum method
Concentration value, using the described second pseudo- abscissa of the concentration value as the second comparison point, the second standard by second calibrating gas
Concentration value as second comparison point ordinate and calculate the of the straight line that second comparison point is determined with the origin
Two slopes；
Judging unit, for judging whether the pseudo- concentration value is more than the described first pseudo- concentration value；
Concentration value determining unit, if the pseudo- concentration value is less than the described first pseudo- concentration value, utilizes formula y=k1×D
Calculate the concentration value of the tested gas；If the pseudo- concentration value is more than the described first pseudo- concentration value, formula y=k is utilized2×
D calculates the concentration value of the tested gas；
Wherein, y is the concentration value of the tested gas；k1For the first slope；k2For second slope；D is described
Pseudo- concentration value.
It is preferred that, first the standard density is 198ppm, and second the standard density is 400ppm.
The data processing method of ultraviolet difference gas analyzer provided by the present invention, first the source spectrum to being tested gas
Data carry out nonlinear compensation amendment, obtain target optical spectral data, regard target optical spectral data as difference absorption spectrum method
Input data.It can so reduce due to the influence of noise that spectrometer is brought by temperature and humidity etc., it is ensured that data are in itself
Reliability.In addition, carrying out staged determination methods calculating to the concentration value that difference absorption spectrum method is calculated again, staged is sentenced
The result that disconnected method is calculated as final tested gas concentration value, so as to reduce due to high concentrations of gas and low concentration gas
The influence that body is brought by detection environment, improves accuracy of detection.
Brief description of the drawings
In order to illustrate more clearly the embodiments of the present invention, the accompanying drawing to be used needed for embodiment will be done simply below
Introduce, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ordinary skill people
For member, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
A kind of flow chart of the data processing method for ultraviolet difference gas analyzer that Fig. 1 provides for the present invention；
A kind of flow chart that nonlinear compensation modification method is carried out to source spectroscopic data that Fig. 2 provides for the present invention；
A kind of flow chart for 2 rank staged determination methods that Fig. 3 provides for the present invention；
A kind of structure chart of the data handling system for ultraviolet difference gas analyzer that Fig. 4 provides for the present invention；
A kind of structure chart for amending unit that Fig. 5 provides for the present invention；
A kind of structure chart for concentration value computing unit that Fig. 6 provides for the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on this
Embodiment in invention, those of ordinary skill in the art are not under the premise of creative work is made, and what is obtained is every other
Embodiment, belongs to the scope of the present invention.
The core of the present invention is to provide a kind of data processing method and system of ultraviolet difference gas analyzer.
In order that those skilled in the art more fully understand the present invention program, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.
Embodiment one
A kind of flow chart of the data processing method for ultraviolet difference gas analyzer that Fig. 1 provides for the present invention.Ultraviolet difference
Dividing the data processing method of gas analyzer includes：
S10：Obtain half-light modal data；
Half-light, which is composed, to be referred to close light source in detection process, and when being nitrogen without detection gas or gas, spectrometer
The data collected.In specific implementation, half-light modal data DPObtained in initialization, be an one-dimension array, array
Size 2048.
S11：Obtain the source spectroscopic data of tested gas；
Source spectroscopic data SPAcquisition be detection environment in light source open, its be passed through detection gas when, spectrometer collection
The data arrived.When being passed through detection gas, one group of absorption spectrum, i.e. source spectroscopic data S can be obtainedP.Wherein, source spectroscopic data
SPIt is also an one-dimension array, array size is also 2048.
S12：Non-thread is carried out to the source spectroscopic data using the half-light modal data and the source spectroscopic data as parameter
Property compensating approach, and obtain target optical spectral data；
In specific implementation, the nonlinear compensation correction coefficient provided by spectrometer carries out non-thread to source spectroscopic data
Property correction.Because the gamma correction system that different spectrometers is provided is different, therefore it wouldn't illustrate here.
S13：The pseudo- concentration value of the corresponding tested gas of the target optical spectral data is calculated using difference absorption spectrum method；
The target optical spectral data that step S12 is obtained then is calculated as the input data source of difference absorption spectrum method
The pseudo- concentration value of tested gas.Here why it is not the concentration value for being tested gas, but pseudo- concentration value, it is because due to tested
The difference of gas concentration height, it is understood that there may be difference, if not handling the value after measurement, the result precision of calculating
It is not high.
S14：The concentration value of the corresponding tested gas of the pseudo- concentration value is calculated 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 taking single k values, the concentration value of tested gas can not be more accurately calculated, it is therefore desirable to use ladder
The judgment mode of formula for concentration value to calculating.
The data processing method for the ultraviolet difference gas analyzer that the present invention is provided, can be carried out to source spectroscopic data first
Nonlinear compensation amendment, using revised target data as difference absorption spectrum method input data.In addition, using rank again
The result that ladder type determination methods are calculated difference absorption spectrum method is calculated, so as to improve accuracy of detection.
A kind of flow chart that nonlinear compensation modification method is carried out to source spectroscopic data that Fig. 2 provides for the present invention.As
One kind is preferred embodiment, described to carry out nonlinear compensation amendment to the source spectroscopic data, and obtains target optical spectral data
Specifically include：
S20：Utilize formula x=SP-DPThe difference of the source spectroscopic data and the half-light modal data is obtained,
Wherein, x is difference；SPFor the source spectroscopic data；DPFor the half-light modal data；
S21：The corresponding correction of the source spectroscopic data is calculated using the difference and nonlinear compensation correction coefficient；
S22：Utilize formula R1=RP+DPThe corresponding correction result of the source spectroscopic data is calculated,
Wherein, RPFor correction；R1For correction result；
S23：Utilize formula R=α R1+βR2Calculate the target optical spectral data.
Wherein, R is target optical spectral data；R2Computational methods and R1Computational methods it is identical, R1And R2It is adjacent non-twice
The correction result that linear compensation amendment is obtained；Alpha+beta=1, α ＞ 0, β ＞ 0.
In specific implementation, source spectroscopic data S is being obtainedPWith the half-light modal data DPDifference x after, 7 ranks can be selected
The coefficient amount of being modified RPCalculating.Utilize formula：
FP=c0+c1x+c2x2+c3x3+c4x4+c5x5+c6x6+c7x7；
RP=x/FP；
Wherein, ci(i=1,2,3 ..., 7) are nonlinear compensation correction coefficient, FPFor intermediate variable.
Obtaining correction RPAfterwards, by correction RPWith half-light modal data DPAddition obtains correction result R1.To ensure spectrum
The continuity of data, transformation of scale is carried out by correction result, that is, utilizes formula R=α R1+βR2Calculate the target optical spectral data R.
Wherein R2Computational methods and R1Computational methods it is identical, R1And R2It is the amendment knot that the adjacent amendment of nonlinear compensation twice is obtained
Really.
What the present invention was provided carries out nonlinear compensation modification method to source spectroscopic data to utilize difference absorption spectrum
Data are modified before method, the reliability of source spectroscopic data is improved.
It should be noted that the 7 rank Coefficient Algorithms used in this preferred embodiment are merely illustrative, in other embodiments
It can be calculated according to actual conditions.
As one kind preferred embodiment, the staged determination methods are 2 rank staged determination methods.
According to the actual requirements, ladder determination methods are chosen, can be by the pseudo- concentration value of the calculating of difference absorption spectrum method
It is divided into several interval.Because the more amounts of calculation in interval are bigger, therefore the preferred embodiment of the present invention is to be judged using 2 rank stageds
Method.
A kind of flow chart for 2 rank staged determination methods that Fig. 3 provides for the present invention.The 2 rank staged determination methods
Specifically include：
S30：The first pseudo- concentration value of the first calibrating gas is calculated using the difference absorption spectrum method；
S31：Using the described first pseudo- concentration value as the first comparison point abscissa；
S32：Using the first the standard density of first calibrating gas as first comparison point ordinate；
S33：Calculate the first slope for the straight line that first comparison point is determined with origin；
S34：The second pseudo- concentration value of the second calibrating gas is calculated using the difference absorption spectrum method；
S35：Using the described second pseudo- concentration value as the second comparison point abscissa；
S36：Using the second the standard density of second calibrating gas as second comparison point ordinate；
S37：Calculate the second slope of the straight line that second comparison point is determined with the origin；
S38：Judge whether the pseudo- concentration value is more than the described first pseudo- concentration value；
S39：If the pseudo- concentration value is less than the described first pseudo- concentration value, formula y=k is utilized1× D calculates described tested
The concentration value of gas；
S40：If the pseudo- concentration value is more than the described first pseudo- concentration value, formula y=k is utilized2× D calculates described tested
The concentration value of gas；
Wherein, y is the concentration value of the tested gas；k1For the first slope；k2For second slope；D is described
Pseudo- concentration value.
As one kind preferred embodiment, first the standard density is 198ppm, second the standard density
For 400ppm.
The concentration of the first calibrating gas is calculated using difference absorption spectrum method, i.e., the first pseudo- concentration value is designated as d1, then the
The coordinate of one comparison point is (d1,198).Straight line is determined using origin (0,0) and the first comparison point (d1,198), is counted
Calculate the slope of the straight line, i.e. first slope k1。
Same method, using the concentration of difference absorption spectrum method the second calibrating gas of calculating, i.e., the second pseudo- concentration value,
D2 is designated as, then the coordinate of the second comparison point is (d2,400).Determined using origin (0,0) and the second comparison point (d2,400)
Straight line, calculates the slope of the straight line, i.e. the second slope k2。
Pseudo- concentration value D and d1 size are judged, if D ＞ d1, utilize formula y=k2× D calculates the tested gas
Concentration value；If D ＜ d1, utilize formula y=k1× D calculates the concentration value of the tested gas.
The 2 rank staged determination methods that the present invention is provided set two conversions for two kinds of situations of high concentration and low concentration
Amount, by judging which amount of translation is the size of pseudo- concentration value determine to choose as final result of calculation, improves testing result
Accuracy.
Need, choosing the concentration value of the first calibrating gas and the second calibrating gas does not have strict regulation, this hair
It is bright to choose the concentration value of the first calibrating gas to reduce the influence that concentration level is brought for 198ppm, the second calibrating gas
Concentration value is 400ppm.Other data are can also be in other embodiments.
Embodiment two
A kind of structure chart of the data handling system for ultraviolet difference gas analyzer that Fig. 4 provides for the present invention.Ultraviolet difference
Divide the data handling system of gas analyzer, including：
Half-light Data acquisition unit 40, for obtaining half-light modal data；
Source spectroscopic data acquiring unit 41, the source spectroscopic data for obtaining tested gas；
Amending unit 42, for using the half-light modal data and the source spectroscopic data as parameter to the source spectrum number
According to progress nonlinear compensation amendment, and obtain target optical spectral data；
Pseudo- concentration value computing unit 43, it is corresponding for calculating the target optical spectral data using difference absorption spectrum method
The pseudo- concentration value of tested gas；
Concentration value computing unit 44, for calculating the corresponding tested gas of the pseudo- concentration value according to staged determination methods
Concentration value.
A kind of structure chart for amending unit that Fig. 5 provides for the present invention.Amending unit 42 includes：
Mathematic interpolation subelement 420, for utilizing formula x=SP-DPObtain the source spectroscopic data and half-light spectrum number
According to difference,
Wherein, x is difference；SPFor the source spectroscopic data；DPFor the half-light modal data；
Correction computation subunit 421, for calculating the source light using the difference and nonlinear compensation correction coefficient
The corresponding correction of modal data；
Correction result computation subunit 422, for utilizing formula R1=RP+DPCalculate that the source spectroscopic data is corresponding to be repaiied
Positive result,
Wherein, RPFor correction；R1For correction result；
Ratio corrected Calculation subelement 423, utilizes formula R=α R1+βR2Calculate the target optical spectral data；
Wherein, R is target optical spectral data；R2Computational methods and R1Computational methods it is identical, R1And R2It is adjacent non-twice
The correction result that linear compensation amendment is obtained；Alpha+beta=1, α ＞ 0, β ＞ 0.
As one kind preferred embodiment, the concentration value computing unit 44 is calculated using 2 rank staged determination methods
The concentration value of the corresponding tested gas of the pseudo- concentration value.
A kind of structure chart for concentration value computing unit that Fig. 6 provides for the present invention.Concentration value computing unit 44 includes：
First slope computing unit 440, for calculating the of the first calibrating gas using the difference absorption spectrum method
One pseudo- concentration value, using the described first pseudo- concentration value as the first comparison point abscissa, first by first calibrating gas
The standard density as first comparison point ordinate and calculate the of the straight line that first comparison point is determined with round dot
One slope；
Second slope calculation unit SCU 441, for calculating the of the second calibrating gas using the difference absorption spectrum method
Two pseudo- concentration values, using the described second pseudo- concentration value as the second comparison point abscissa, second by second calibrating gas
The straight line that the standard density is determined as the ordinate and calculating second comparison point of second comparison point with the round dot
The second slope；
Judging unit 442, for judging whether the pseudo- concentration value is more than the described first pseudo- concentration value；
Concentration value determining unit 443, if the pseudo- concentration value is less than the described first pseudo- concentration value, utilizes formula y=k1
× D calculates the concentration value of the tested gas；If the pseudo- concentration value is more than the described first pseudo- concentration value, formula y=is utilized
k2× D calculates the concentration value of the tested gas；
Wherein, y is the concentration value of the tested gas；k1For the first slope；k2For second slope；D is described
Pseudo- concentration value.
As one kind preferred embodiment, first the standard density is 198ppm, second the standard density
For 400ppm.
Because embodiment two is the corresponding system of method of embodiment one, specific embodiment refers to embodiment one,
Here it wouldn't repeat.
The data processing method and system to ultraviolet difference gas analyzer provided by the present invention have been carried out in detail above
Introduce.Specific case used herein is set forth to the principle and embodiment of the present invention, the explanation of above example
It is only intended to help and understands the method for the present invention and its core concept.It should be pointed out that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvement and modification can also be carried out to the present invention, these improve and
Modification is also fallen into the protection domain of the claims in the present invention.
Claims (6)
1. a kind of data processing method of ultraviolet difference gas analyzer, it is characterised in that including：
Obtain half-light modal data；
Obtain the source spectroscopic data of tested gas；
Nonlinear compensation is carried out using the half-light modal data and the source spectroscopic data to the source spectroscopic data as parameter to repair
Just, and target optical spectral data is obtained；
The pseudo- concentration value of the corresponding tested gas of the target optical spectral data is calculated using difference absorption spectrum method；
The concentration value of the corresponding tested gas of the pseudo- concentration value is calculated according to staged determination methods；
Wherein, the staged determination methods are 2 rank staged determination methods；
The 2 rank staged determination methods are specifically included：
The first pseudo- concentration value of the first calibrating gas is calculated using the difference absorption spectrum method；
Using the described first pseudo- concentration value as the first comparison point abscissa；
Using the first the standard density of first calibrating gas as first comparison point ordinate；
Calculate the first slope for the straight line that first comparison point is determined with origin；
The second pseudo- concentration value of the second calibrating gas is calculated using the difference absorption spectrum method；
Using the described second pseudo- concentration value as the second comparison point abscissa；
Using the second the standard density of second calibrating gas as second comparison point ordinate；
Calculate the second slope of the straight line that second comparison point is determined with the origin；
Judge whether the pseudo- concentration value is more than the described first pseudo- concentration value；
If the pseudo- concentration value is less than the described first pseudo- concentration value, formula y=k is utilized1× D calculates the dense of the tested gas
Angle value；
If the pseudo- concentration value is more than the described first pseudo- concentration value, formula y=k is utilized2× D calculates the dense of the tested gas
Angle value；
Wherein, y is the concentration value of the tested gas；k1For the first slope；k2For second slope；D is that the puppet is dense
Angle value.
2. the data processing method of ultraviolet difference gas analyzer according to claim 1, it is characterised in that described to institute
State source spectroscopic data and carry out nonlinear compensation amendment, and obtain target optical spectral data and specifically include：
Utilize formula x=SP-DPThe difference of the source spectroscopic data and the half-light modal data is obtained,
Wherein, x is difference；SPFor the source spectroscopic data；DPFor the half-light modal data；
The corresponding correction of the source spectroscopic data is calculated using the difference and nonlinear compensation correction coefficient；
Utilize formula R1=RP+DPThe corresponding correction result of the source spectroscopic data is calculated,
Wherein, RPFor correction；R1For correction result；
Utilize formula R=α R1+βR2Calculate the target optical spectral data；
Wherein, R is target optical spectral data；R2Computational methods and R1Computational methods it is identical, R1And R2It is adjacent non-linear twice
The correction result that compensating approach is obtained；Alpha+beta=1, α ＞ 0, β ＞ 0.
3. the data processing method of ultraviolet difference gas analyzer according to claim 1, it is characterised in that described first
The standard density is 198ppm, and second the standard density is 400ppm.
4. a kind of data handling system of ultraviolet difference gas analyzer, it is characterised in that including：
Half-light Data acquisition unit, for obtaining half-light modal data；
Source spectroscopic data acquiring unit, the source spectroscopic data for obtaining tested gas；
Amending unit, for being carried out using the half-light modal data and the source spectroscopic data as parameter to the source spectroscopic data
Nonlinear compensation amendment, and obtain target optical spectral data；
Pseudo- concentration value computing unit, for calculating the corresponding tested gas of the target optical spectral data using difference absorption spectrum method
The pseudo- concentration value of body；
Concentration value computing unit, the concentration for calculating the corresponding tested gas of the pseudo- concentration value according to staged determination methods
Value；
Wherein, the concentration value computing unit calculates the corresponding tested gas of the pseudo- concentration value using 2 rank staged determination methods
The concentration value of body；
The concentration value computing unit includes：
First slope computing unit, the first pseudo- concentration for calculating the first calibrating gas using the difference absorption spectrum method
Value, using the described first pseudo- abscissa of the concentration value as the first comparison point, the first normal concentration by first calibrating gas
It is worth the first slope of the straight line determined as the ordinate and calculating first comparison point of first comparison point with origin；
Second slope calculation unit SCU, the second pseudo- concentration for calculating the second calibrating gas using the difference absorption spectrum method
Value, using the described second pseudo- abscissa of the concentration value as the second comparison point, the second normal concentration by second calibrating gas
Be worth the straight line determined as the ordinate and calculating second comparison point of second comparison point with the origin second is oblique
Rate；
Judging unit, for judging whether the pseudo- concentration value is more than the described first pseudo- concentration value；
Concentration value determining unit, if the pseudo- concentration value is less than the described first pseudo- concentration value, utilizes formula y=k1× D calculates institute
State the concentration value of tested gas；If the pseudo- concentration value is more than the described first pseudo- concentration value, formula y=k is utilized2× D is calculated
The concentration value of the tested gas；
Wherein, y is the concentration value of the tested gas；k1For the first slope；k2For second slope；D is that the puppet is dense
Angle value.
5. the data handling system of ultraviolet difference gas analyzer according to claim 4, it is characterised in that the amendment
Unit includes：
Mathematic interpolation subelement, for utilizing formula x=SP-DPObtain the difference of the source spectroscopic data and the half-light modal data
Value,
Wherein, x is difference；SPFor the source spectroscopic data；DPFor the half-light modal data；
Correction computation subunit, for calculating the source spectroscopic data pair using the difference and nonlinear compensation correction coefficient
The correction answered；
Correction result computation subunit, for utilizing formula R1=RP+DPThe corresponding correction result of the source spectroscopic data is calculated,
Wherein, RPFor correction；R1For correction result；
Ratio corrected Calculation subelement, utilizes formula R=α R1+βR2The target optical spectral data is calculated,
Wherein, R is target optical spectral data；R2Computational methods and R1Computational methods it is identical, R1And R2It is adjacent non-linear twice
The correction result that compensating approach is obtained；Alpha+beta=1, α ＞ 0, β ＞ 0.
6. the data handling system of ultraviolet difference gas analyzer according to claim 4, it is characterised in that described first
The standard density is 198ppm, and second the standard density is 400ppm.
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