Fourier transform infrared spectrum distortion identifying and processing method

Abstract

The invention discloses a Fourier transform infrared spectrum distortion identifying and processing method. Aiming at the problem of inaccurate analysis result caused by spectrum distortion due to the factors of environment change and the like in a Fourier transform infrared spectrum analysis-based gas online analysis process, the method comprises the following steps of: aiming at a specific application situation, determining possible components in the gas to be analyzed, searching spectral lines nearly insensitive to all the components in the whole spectrum wave number range according to the spectrum of the gas components, and correcting base line rule distortion in the spectrum by adopting a spectrogram sectioned rotation and translation method according to the spectrum values of the spectral lines; performing gas concentration quantitative analysis by using the corrected spectrum, and performing spectrum reconstruction according to the analysis result; and judging whether the spectrum has local irregular distortion according to the difference between the reconstructed spectrum and the actual spectrum, if so, abandoning the analysis result, and if the local irregular distortion is continuously caused, rescanning the background to eliminate the deviation of the spectrum distortion to the analysis result.

Description

technical field [0001] The invention relates to the field of gas online analysis based on spectral analysis, including online analysis of oil and gas components in oil and natural gas exploration, online analysis of power equipment fault gas, online analysis of mine safety gas, factory flue gas and petrochemical associated gas in environmental protection , On-line analysis of internal combustion engine exhaust, on-line monitoring of air quality in factories and ships. Background technique [0002] Spectral analysis is one of the important methods for analyzing gas components and their concentrations. In recent years, with the improvement of data processing, data transmission, and data storage technology, spectral analysis has begun to be applied to on-site online analysis of gases. Since there are many components involved in the spectrometer, and many components are affected by environmental factors, for example, the TGS detector in the spectrometer is affected by temperatu...

AI Technical Summary

Problems solved by technology

Since there are many components involved in the spectrometer, and many components are affected by environmental factors, for example, the TGS detector in the spectrometer is affected by temperature, so that after the spectrometer works continuously for a long time, the spectrum is prone to distortion, which may cause the analysis results to be out of order. The large deviation seriously affects the popularization and application of the spectrometer

Although regular background scanning helps to reduce the probability of spectral distortion and the degree of distortion, because the gas cell needs to be cleaned during background scanning, it takes several minutes, resulting in the loss of online analysis data

Images