Method for correcting spectrum drift and device thereof

Abstract

The invention relates to a method for correcting spectrum drift and a device thereof. The method for correcting spectrum drift comprises the following steps that (A1) a correction light source is incident to a correction light path through a correction incident seam so as to obtain correction light source signals; (A2) the spectral data of correction light source characteristic spectral lines are acquired, and the corresponding i initial coordinates of the characteristic spectral lines are acquired according to the relational expression (xi, yi)=f(lambdai) of the wavelength and the position, wherein i>=1; and peak searching is performed from the X direction and the Y direction with the i initial coordinates acting as he center so that the actual coordinates are obtained and then i offset (deltaxi,deltayi) is acquired, and the drift correction coefficient (deltax,deltay)=f(deltaxi,deltayi,omigai) is acquired through fitting, wherein the X direction and the Y direction are mutually perpendicular; and (A3) a light source under test is incident to the main light path, the spectral data of the light source under test are acquired, and the position of the spectrum under test is corrected by utilizing the drift correction coefficient. The method for correcting spectrum drift and the device thereof have the advantages of two-dimensional peak searching, real-time correction and main light path interference elimination.

Description

technical field [0001] The invention relates to the field of spectral analysis, in particular to a method and device for real-time two-dimensional correction of spectral drift. Background technique [0002] The ideal working environment of the spectrometer is a constant temperature environment, but due to various restrictions, the ambient temperature often fluctuates, and the fluctuation of temperature will cause the position of the spectrum collected by the instrument to drift, affecting the accuracy of the analysis results; it will also lead to continuous increase in the analysis results Or drop, reduce the stability index of the instrument. At present, the precise control of the light chamber and the calibration of the light source are usually used to correct the spectral drift, but there are the following defects: [0003] 1. Optical chamber temperature control: paste heating wire, temperature detector and insulation cotton on the surface of the optical chamber to keep ...

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Problems solved by technology

[0003] 1. Optical chamber temperature control: paste heating wire, temperature detector and insulation cotton on the surface of the optical chamber to keep the temperature of the optical chamber relatively stable; however, when the external temperature changes, the temperature distribution of the optical chamber will still change, and the spectral position will remain the same. There is a slight drift;

[0004] 2. Light source calibration: Inject the calibration light source (mercury lamp), collect the position of the corrected spectrum, calculate the spectral shift coefficient, and then calculate the actual position of other spectra; however, when the spectral position drifts, it is always accompanied by a small amount of scaling or Distortion, resulting in a certain deviation in the actual position of the calculated spectrum