Marking method for background noise difference removal in laser Raman gas analysis system

Abstract

The invention relates to a marking method for background noise difference removal in a laser Raman gas analysis system. The marking method is based on a Raman scattering spectrogram of marked gases and an intermediate carrier gas and comprises the steps that firstly, the influence of ground noise of the system is eliminated, so that a Raman scattering spectrogram of the marked gases and the intermediate carrier gas without background noise is obtained; a marking constant is obtained through data processing on information obtained from the spectrogram, and according to the physical characteristics of the gas, the marking constant is not influenced by the temperature, the pressure, the environment and other factors; in this way, all known gases can be marked relative to the intermediate carrier gas, and a marking database of all the gases relative to the intermediate carrier gas is established. The marking method is used for marking in the laser Raman gas analysis system, effective Raman information can be effectively extracted from complicated background noise, the marking precision is greatly improved, and therefore the measuring precision of the system is improved; besides, the marking method is simple and easy to implement.

Description

technical field [0001] The invention relates to a calibration method for a laser Raman gas analysis system, in particular to a calibration method for differentially removing background noise in a laser Raman gas analysis system. Background technique [0002] Scattering occurs when light hits a substance. When scattering occurs, the wavelength of most of the scattered light does not change, and this kind of scattering without changing wavelength is called Rayleigh scattering; the wavelength of a small part of scattered light will increase or decrease, and this kind of scattering with changing wavelength It is called Raman scattering, and its corresponding spectrum is called Raman spectrum. [0003] The Raman spectrum is the basis for analyzing substances using Raman spectroscopy. The fixed-wavelength laser Raman scattering technology is one of the most advanced gas measurement technologies. It has developed rapidly in recent years and is considered to be a revolutionary chan...

AI Technical Summary

Problems solved by technology

The above methods can effectively remove the interference of its noise and fluorescence in some cases, but in a complex system, these methods are powerless for the Raman spectrum interference of other non-detecting substances. When faced with high-intensity fluorescence background interference also can not achieve the desired effect

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