Method for automatically detecting and dynamically substracting stray light of spectrometer and spectrometer

Abstract

The invention discloses a method for automatic detection and dynamic subtraction of the stray light for a spectrometer by spectral scanning or wavelength biasing. The method comprises the following steps: firstly, a spectral scanning image of a line source for the spectrometer is obtained by adopting a single-channel or dual-channel wavelength scanning method; secondly, the spectral scanning data is processed to obtain stray light ratio data; then the stray light ratio value in the stray light subtraction formula is reset by using the obtained stray light ratio data; and finally, the dynamic subtraction is carried out on the single-channel or dual-channel stray light while the normal test is carried out on the signal received by the spectrometer. The invention has the advantages that any hardware cost is not added under the precondition without using any standard substance, and the optical spectrum instrument performs stray light automatic detection and dynamic subtraction thereof by using the spectral properties of the line source, therefore, the light precision, the linear range and the background correction capability of the atomic absorption spectrometer are greatly improved; and the background correction capability of the spectrometer can be improved to more than 100 times (1Abs) and to more than 80 times (2Abs) when the technology is applied to the high performance self-absorption background correction of the atomic absorption spectrometer.

Description

technical field [0001] The invention belongs to the field of spectroscopic analysis instruments, and in particular relates to a method for automatic detection and dynamic subtraction of spectrometer stray light by using spectral scanning or wavelength bias in an atomic absorption spectrometer. The invention also relates to an atomic absorption spectrometer which uses spectral scanning or wavelength offset to automatically detect and dynamically subtract spectrometer stray light. Background technique [0002] Since the 1950s, the Australian physicist Walsh first proposed the application of atomic absorption spectroscopy to chemical analysis, and it has become one of the most important tools for element quantitative analysis and is widely used in various analysis fields. The size of stray light is an important index of spectroscopic instrument performance. When the atomic absorption spectrometer needs to achieve good optical accuracy, wide linear range, and high background co...

AI Technical Summary

Problems solved by technology

[0009] At home and abroad, there is no report on "Automatic detection and dynamic subtraction of stray light in spectrometers using spectral scanning or wavelength bias" and spectroscopic instruments using this method

Images