A Multifactor Correction Raman Spectroscopy Quantitative Analysis Method Combined with Spectral Internal Standard
A Raman spectroscopy and quantitative analysis technology, applied in Raman scattering, material excitation analysis, etc., to achieve the effect of eliminating laser power and high-accuracy quantitative analysis
Active Publication Date: 2022-04-26
CHONGQING UNIV
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However, in addition to the concentration or content of the substance, the intensity of the Raman spectrum peak will also be affected by many factors, such as laser power fluctuations, temperature changes, detection equipment performance fluctuations, optical path collimation changes, etc.
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Embodiment 1
[0070] The basic structure of the Raman spectrum detection system used in the embodiment is as follows figure 2 shown;
[0071] During calibration, the analyte CO 2 Concentration is c 0 =50000ppm, internal standard substance SF 6 for pure SF 6 , that is, the concentration is approximately 100%. SF 6 The concentration calibration is the same as the actual detection;
[0072] CO 2 and SF 6 Raman spectrum such as image 3 shown, for CO 2 Raman peak (1388cm -1 ) and SF 6 Raman spectrum peak (774cm -1 ) can be obtained after peak intensity calculation: A 0 =3233551;A s0 =1246100;
[0073] to CO 2 The temperature for calibration is 25°C;
[0074] In actual detection, the measured CO 2 (the real concentration is 20000ppm) filled in the sample chamber A; the internal standard substance is pure SF 6 Fill into another independent sample chamber B;
[0075] to CO 2 The temperature for the actual Raman spectrum detection is 20°C;
[0076] According to the obtained C...
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The application discloses a multi-factor correction Raman spectrum quantitative analysis method combined with a spectral internal standard, including spectral calibration of the Raman peak of the analyte; measuring the Raman signals of the analyte and the internal standard substance respectively, and generating Raman Spectrum; perform baseline correction on the Raman spectrum; calculate the Raman peak intensity of the analyte and internal standard substance according to the baseline-corrected Raman spectrum; obtain the analyte and internal standard according to the actual detection temperature and calibration temperature The temperature correction coefficient of the Raman peak intensity of the substance; comprehensively considering the laser power, the change of the optical path, the performance fluctuation of the detection equipment and the temperature factor, the Raman peak intensity correction model of the object to be tested is established; the Raman peak intensity of the object to be measured is corrected, and the calculated The concentration of the test substance. The present invention can perform multi-factor correction on the measurement results of Raman spectroscopy through the internal standard value of the spectrum, and can eliminate the influence of factors such as laser power, integration time, optical path changes, and detector performance fluctuations, and finally realize high and accurate quantification of Raman spectroscopy analyze.
Description
technical field [0001] The invention belongs to the technical field of Raman spectrum material detection, and relates to a multi-factor correction Raman spectrum quantitative analysis method combined with a spectrum internal standard. Background technique [0002] The Raman spectroscopy material detection method can measure a variety of mixed substances at the same time, and has strong selectivity and good anti-aging ability. Therefore, it has been widely used in gas composition detection, liquid composition analysis, solid composition detection and other fields. After the Raman spectroscopy is used to measure the analyte, in order to obtain the concentration or content of the analyte, the measured Raman spectrum needs to be quantitatively analyzed. [0003] At present, the quantitative analysis method of Raman spectroscopy is usually the peak intensity direct calculation method, that is, the measured peak intensity of the analyte is directly compared with the reference peak...
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IPC IPC(8): G01N21/65
CPCG01N21/65
Inventor 陈伟根王品一王建新万福李剑王飞鹏黄正勇王强谭亚雄潘建宇
Owner CHONGQING UNIV