Real-time compensation method of measurement errors caused by spectrograph wavelength drift

A technology of wavelength drift and measurement error, applied in the measurement of color/spectral characteristics, etc., can solve the problems that the system calibration is no longer applicable to the system, the method is cumbersome, and the continuous monitoring instrument is not allowed, so as to improve the measurement accuracy, solve the measurement inaccuracy, Reduces the effect of instrument instability

Active Publication Date: 2014-12-10
NANJING GUODIAN ENVIRONMENTAL PROTECTION TECH
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Problems solved by technology

[0003] However, none of the spectrometers has the function of automatically calibrating the wavelength, and the wavelength calibration method provided by the spectrometer manufacturer is to calibrate the spectrometer through a mercury lamp or other characteristic light sources. stop working, which is not allowed for continuous moni

Method used

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  • Real-time compensation method of measurement errors caused by spectrograph wavelength drift
  • Real-time compensation method of measurement errors caused by spectrograph wavelength drift
  • Real-time compensation method of measurement errors caused by spectrograph wavelength drift

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Embodiment Construction

[0048] (The following combination Figure 1-Figure 4 , the present invention is described in further detail)

[0049] Take the absorption spectrum of NO as an example below, such as figure 2 The spectrometer shown has wavelength drift, and the specific implementation process is explained:

[0050] Step 1: Spectral data denoising

[0051] Since the absorption feature of the measured gas in the measurement light of a single scan of the spectrometer is not obvious, and the data has relatively large noise, the measurement data of 10 times are averaged to obtain the averaged measurement light spectrum data I 1 . Under the nitrogen gas situation, take 10 spectrometer measurement data and carry out average, obtain the reference light spectrum data I when there is no absorption 0 .

[0052] Step 2: Extract the absorbance of the measured gas

[0053] According to Lambert's law, for the NO gas to be measured, from I 1 Extract the wavelength band corresponding to absorption (223n...

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Abstract

The invention designs a real-time compensation method of measurement errors caused by spectrograph wavelength drift. The method comprises the following steps: calculating the spectrograph wavelength drift by utilizing real-time measured spectral data of a measured gas and an absorption cross section database of the measured gas measured in a laboratory, and calculating the spectrograph wavelength drift; calculating a measured gas absorption cross section corresponding to a translational wavelength of the wavelength drift and measured gas absorbance for calculating concentration of the measured gas; eliminating the measurement errors caused by the wavelength drift in real time.

Description

technical field [0001] The invention relates to a real-time compensation method for the measurement error caused by the wavelength drift of a spectrometer. technical background [0002] The spectrometer is a device that detects the position and intensity of the corresponding wavelength of the spectral line with a photodetector. It is the core component of spectral absorption technology instruments such as ultraviolet differential absorption spectroscopy technology. With the continuous improvement of national flue gas emission standards, the existing infrared analysis instruments and conventional ultraviolet differential absorption spectroscopy technology have been difficult to meet the requirements of low detection limit, high sensitivity and high resolution of flue gas analysis, which is a long-term problem. The wavelength stability of the spectrometer, the core component of the ultraviolet differential absorption spectroscopic analysis instrument under the condition of tim...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 汤光华韩少鹏武善磊林正根苗丰杨剑孔红兵彭樟李利刘璐
Owner NANJING GUODIAN ENVIRONMENTAL PROTECTION TECH
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