CN103728267A - Method for correcting baseline of spectrogram in near infrared analysis of gasoline - Google Patents
Method for correcting baseline of spectrogram in near infrared analysis of gasoline Download PDFInfo
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- CN103728267A CN103728267A CN201410021091.7A CN201410021091A CN103728267A CN 103728267 A CN103728267 A CN 103728267A CN 201410021091 A CN201410021091 A CN 201410021091A CN 103728267 A CN103728267 A CN 103728267A
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Abstract
The invention relates to a method for correcting a baseline of a spectrogram in near infrared analysis of gasoline. According to the method, the wave length of two points in the near infrared spectrum of gasoline and average optical density of points nearby the two points are taken as datum points so as to establish a straight line equation, and other points in the spectrum are corrected by the straight line equation. The method has the beneficial effects that firstly, the spectrogram with the corrected baseline can effectively eliminate the phenomenon of baseline drift of the spectrogram, thus being beneficial to improvement of the accuracy of the predicted value; secondly, the method can be conveniently used for online correcting the near infrared spectrogram of gasoline in gasoline blending.
Description
Technical field
The present invention relates to the baseline correction method of spectrogram in a kind of gasoline near-infrared analysis process.
Background technology
It is last procedure before gasoline dispatches from the factory that gasoline is in harmonious proportion, and is related to the quality of product oil and the benefit of refinery.Along with the upgrading of gasoline quality index, traditional pot type accord method can not meet mediation demand.The pipeline Blending of gasoline has obvious advantage on energy-saving and emission-reduction, raising gasoline quality index.But the optimal control process that gasoline pipeline is in harmonious proportion depends on near-infrared analyzer: the stability of analyser and precision are to be in harmonious proportion to control the basis of optimizing.Because near-infrared analyzer is easily subject to the impact of baseline wander, temperature, ground unrest etc. in operational process, thereby cause the gasoline near infrared spectrogram generation drift or the deformation effect that collect to arrive the precision of prediction; When utilizing near infrared technology prediction gasoline attribute, need to carry out necessary pre-service to spectrogram.At present conventional pretreatment mode has: derivative, level and smooth, standardization, centralization etc., but for the pre-service of the near infrared spectrum of gasoline, all can not get desirable effect.How under the prerequisite of complexity that does not increase algorithm, thereby spectrum is carried out to suitable processing, to eliminate the impact of ground unrest and spectrogram drift most important.
Summary of the invention
In order to solve the problems of the technologies described above, the present invention proposes a kind of method that can proofread and correct gasoline near infrared spectrum in real time online, and the method principle is simple, convenience of calculation, and can effectively eliminate the interference of ground unrest.
The calibration set of the near infrared spectrum modeling that the inventive method provides is selected to comprise the following steps:
Step 1: gather gasoline sample, obtain the near infrared spectrum of gasoline sample;
Step 2: choose 2 wavelength x in gasoline near infrared spectrum
1, x
2place is as reference point;
Step 3: for the reference point x in step 2
i, do following calculating: near this reference point wavelength, select the mean value of a plurality of wavelength points place absorbance to be designated as y
i, i=1 or 2 wherein;
Step 4: the reference point point (x obtaining by step 3, step 4
1, y
1) and (x
2, y
2) definite straight-line equation l
Step 5: calculate all wavelengths point x near infrared spectrum according to equation l
ithe y at place
i;
Step 6: near infrared spectrum corresponding wavelength point x
ithe absorbance at place deducts corresponding y
i.
Preferably, the gasoline sample in described step 1 comes from gasoline pipeline harmonic process, and sample does not need through any pre-service.
Preferably, in described step 1 near infrared spectrum to obtain be by on-line nir system, to gather the near infrared spectrum of gasoline.
Preferably, the reference point in described step 2 is taken at the wavelength period that absorbance is 0-0.02.
Preferably, selecting a plurality of wavelength points described in described step 3 near reference point wavelength, is 5-10 wavelength points.
In the time of near-infrared analyzer on-line operation, by this method, can to each general point collecting, do identical processing automatically, processing speed is fast, successful.
The present invention has following beneficial effect: the spectrogram after (1) baseline correction can be eliminated the baseline wander of spectrogram effectively, is of value to the precision that improves predicted value; (2) the method can be applied to the on-line correction of gasoline near infrared spectrogram in gasoline harmonic process easily.
Accompanying drawing explanation
The original spectrogram of near infrared spectrum of Fig. 1-1:93# gasoline;
Fig. 1-2: the original spectrogram of near infrared spectrum after the baseline correction of 93# gasoline.
Embodiment
Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
The baseline correction method of spectrogram in gasoline near-infrared analysis process, comprises the following steps:
Step 1: the finished product 93# gasoline near infrared sample that utilizes on-line nir system to gather to be in harmonious proportion in gasoline pipeline harmonic process house steward place.In gatherer process, gasoline does not need through any pre-service.The near infrared original spectrogram of gasoline is shown in accompanying drawing 1-1.
Step 2: choose 1090nm and 1310nm as reference point, and make x
1=1090, x
2=1310
Step 3: the mean value that calculates near 5 points of reference point.That is: the mean value of calculating 1088,1089,1090,1091, five wavelength points place absorbances of 1092nm is designated as y
1, 1308,1309,1310,1311, the mean value of five wavelength points place absorbances of 1312nm is designated as y
2.
Step 4: according to point (x
1, y
1) and (x
2, y
2), obtained this straight-line equation l of 2.
Step 5: obtain 1000-1600nm, step-length is 1nm, all 601 y that wavelength points is corresponding
Step 6: the absorbance of each wavelength points of original gasoline near infrared spectrum deducts corresponding y, the spectrogram after can being proofreaied and correct.Gasoline near infrared spectrum spectrogram before and after proofreading and correct is shown in accompanying drawing 1-1, Fig. 1-2, and as seen from the figure, serious drift, especially 1000-1100nm occur original near infrared spectrogram baseline, and 1250-1320nm, near 1400-1600nm wavelength period.After proofreading and correct through the inventive method, baseline wander disappears substantially, and spectrogram is more level and smooth, and noise signal is less.
The present embodiment take that to analyze gasoline research method octane value (RON) attribute be example, but also can be for the analysis of other attributes of gasoline, as: motor octane number, anti-knock index, Reid vapour pressure, sulfur content, density, olefin(e) centent, arene content, or/and benzene content.
Only for the preferred embodiment of invention, be not used for limiting practical range of the present invention in sum.Be that all equivalences of doing according to the content of the present patent application the scope of the claims change and modify, all should be technology category of the present invention.
Claims (5)
1. the baseline correction method of spectrogram in gasoline near-infrared analysis process, mainly comprises the following steps:
Step 1: the near infrared spectrum that obtains gasoline sample;
Step 2: choose 2 wavelength x in gasoline near infrared spectrum
1, x
2place is as reference point;
Step 3: for the reference point x in step 2
i, do following calculating: near this reference point wavelength, select the mean value of a plurality of wavelength points place absorbance to be designated as y
i, i=1 or 2 wherein;
Step 4: the reference point (x obtaining by step 2, step 3
1, y
1) and (x
2, y
2) determine straight-line equation l
Step 5: calculate all wavelengths point x near infrared spectrum according to equation l
ithe y at place
i;
Step 6: near infrared spectrum corresponding wavelength point x
ithe absorbance at place deducts corresponding y
i.
2. bearing calibration as claimed in claim 1, is characterized in that, the gasoline sample in described step 1 comes from gasoline pipeline harmonic process, and sample does not need through any pre-service.
3. bearing calibration as claimed in claim 1, is characterized in that, in described step 1, to obtain be by on-line nir system, to gather the near infrared spectrum of gasoline near infrared spectrum.
4. bearing calibration as claimed in claim 1, is characterized in that, the reference point in described step 2 is taken at the wavelength period that absorbance is 0-0.02.
5. the bearing calibration as described in claim 1 or 4, is characterized in that, selects a plurality of wavelength points described in described step 3 near reference point wavelength, is 5-10 wavelength points.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104266981A (en) * | 2014-08-28 | 2015-01-07 | 北京环境特性研究所 | Terahertz wave absorption spectrum recognition method |
| CN106407648A (en) * | 2016-08-26 | 2017-02-15 | 南京富岛信息工程有限公司 | Rapid batch forecast method for key property of gasoline |
| CN107703097A (en) * | 2017-10-20 | 2018-02-16 | 华东理工大学 | Utilize the method and its application of decay total reflection probe and the model of near infrared spectrometer structure fast prediction oil property |
| CN112461782A (en) * | 2019-10-17 | 2021-03-09 | 山东金璋隆祥智能科技有限责任公司 | Spectrum correction technology based on GSA near-infrared spectrometer |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104266981A (en) * | 2014-08-28 | 2015-01-07 | 北京环境特性研究所 | Terahertz wave absorption spectrum recognition method |
| CN106407648A (en) * | 2016-08-26 | 2017-02-15 | 南京富岛信息工程有限公司 | Rapid batch forecast method for key property of gasoline |
| CN107703097A (en) * | 2017-10-20 | 2018-02-16 | 华东理工大学 | Utilize the method and its application of decay total reflection probe and the model of near infrared spectrometer structure fast prediction oil property |
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| CN112461782A (en) * | 2019-10-17 | 2021-03-09 | 山东金璋隆祥智能科技有限责任公司 | Spectrum correction technology based on GSA near-infrared spectrometer |
| CN112461782B (en) * | 2019-10-17 | 2022-11-01 | 山东金璋隆祥智能科技有限责任公司 | Spectrum correction technology based on GSA near-infrared spectrometer |
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Application publication date: 20140416 |