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Method for Improving Measurement Accuracy of Raman Spectrometer Wavenumber Migration

A Raman spectrometer and measurement accuracy technology, which is applied in the field of improvement of spectral measurement accuracy, can solve problems such as lack of driving force, no actual improvement in accuracy, and decrease in measurement accuracy, so as to expand spectral sampling frequency and increase the number of translational adjustment steps , Improve the effect of measurement accuracy

Active Publication Date: 2021-11-02
上海如海仪器设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Micro-small laser Raman spectrometer, the usual array detector is limited by the number of pixel arrays, the reading accuracy of the migration wavenumber of the 2000-pixel instrument is about ± 0.5 wavenumber
However, for some studies such as the relationship between Raman spectrum and temperature and pressure, more precise readings are required, and large-scale Raman instruments with much higher prices need to be selected; or interpolation methods are used, but because no effective information is added, the effect of direct interpolation only improves the estimation accuracy, the accuracy does not actually improve
[0003] The measurement fluctuation caused by the limitation of laser precision is an important reason for the decrease of measurement precision
At present, for lasers with acceptable cost, the usual index of Raman spectrum is generally greater than ±0.5 wave number, which is equivalent to the reading value of the pixel array, which makes the design and manufacture of the instrument lack the driving force to choose higher pixel imaging components

Method used

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  • Method for Improving Measurement Accuracy of Raman Spectrometer Wavenumber Migration
  • Method for Improving Measurement Accuracy of Raman Spectrometer Wavenumber Migration
  • Method for Improving Measurement Accuracy of Raman Spectrometer Wavenumber Migration

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Experimental program
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Embodiment 1

[0056] A method for improving the measurement accuracy of wavenumber migration of a Raman spectrometer, the method comprising the following steps:

[0057] 1) Estimate the degree of wavenumber drift of the spectrometer Rang:

[0058] 1-1) For a set of selected Raman spectrometers, use a substance with a simple peak position such as carbon tetrachloride to perform multiple measurements within a certain period of time with a longer integration time, and record the spectrum S of each measurement i ;

[0059] 1-2) Read the pixel serial number NP of the same peak position under each measurement i , forming a sequence NP =[NP i ];

[0060] 1-3) Sequence NP The extreme difference is the abscissa drift degree Rang of the spectrometer in pixels;

[0061] 2) Spectral measurement, interpolation and translation correction:

[0062] 2-1) Decompose the single measurement of long integration time tl into multiple small unit time ts, and carry out continuous unit time spectrum acquisit...

Embodiment 2

[0077] A method for improving the accuracy of Raman spectrometer wavenumber shift measurement, the method is basically the same as that of Embodiment 1, except that steps 2-2) and 2-3) are different.

[0078] The present invention comprises the following steps:

[0079] 1) Estimate the degree of wavenumber drift of the spectrometer Rang:

[0080] 1-1) For a set of selected Raman spectrometers, use a substance with a simple peak position such as carbon tetrachloride to perform multiple measurements within a certain period of time with a longer integration time, and record the spectrum S of each measurement i ;

[0081] 1-2) Read the pixel serial number NP of the same peak position under each measurement i , forming a sequence NP =[NP i ];

[0082] 1-3) Sequence NP The extreme difference is the abscissa drift degree Rang of the spectrometer in pixels;

[0083] 2) Spectral measurement, interpolation and translation correction:

[0084] 2-1) Decompose the single measuremen...

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Abstract

A method for improving the measurement accuracy of wavenumber migration of a Raman spectrometer relates to a method for improving the accuracy of spectral measurement, the method comprising the following steps: 1) estimating the degree of wavenumber drift Rang of the spectrometer; A single measurement with a long integration time is decomposed into multiple small unit time measurements, and the initial unit is selected as a reference, and a unified linear interpolation process and translation correction are performed on the reference and subsequent unit spectra; 3) Spectral merging, contrast value, and calibration wavenumber Migration coordinate output: After translation correction, the series of unit spectra are re-accumulated into a single spectrum, and multiple single-row spectra are compared, and the contrast value is used for trial calculation, and the accuracy of the output instrument is redefined, and the wavenumber migration coordinates are calibrated, and the measurement results are output. The invention can effectively improve the measurement accuracy of Raman spectrum wavenumber, and the method is simple and easy to popularize and apply.

Description

technical field [0001] The invention relates to a method for improving the accuracy of spectral measurement, in particular to a method for improving the measurement accuracy of wave number migration of a Raman spectrometer. Background technique [0002] The accuracy of the measurement reading is an important indicator of the instrument. For micro laser Raman spectrometers, due to the limitation of the number of pixel arrays in the usual array detector, the reading accuracy of the migration wavenumber of the 2000-pixel instrument is about ± 0.5 wavenumber. However, for some studies such as the relationship between Raman spectrum and temperature and pressure, more precise readings are required, and large-scale Raman instruments with much higher prices need to be selected; or interpolation methods are used, but because no effective information is added, the effect of direct interpolation Only the estimation accuracy is improved, the precision is not actually improved. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65
CPCG01N21/65
Inventor 姚志湘姚桔粟晖张景清
Owner 上海如海仪器设备有限公司