Linear Measurement Method of Gas Concentration Based on Adaptive Differential Absorption Spectroscopy

Abstract

The invention provides a linear measurement method of gas concentration based on adaptive differential absorption spectroscopy technology, which includes the acquisition and processing of the full spectrum data of the gas to be measured, the automatic selection of the measurement band and the calculation of the estimated coefficient by the adaptive sliding window, and the adaptive dynamic screening of the most the optimal estimation coefficient, inverting the optimal measurement concentration value of the gas to be measured, and calculating the relative measurement error; the invention completes the automatic division of the measurement band through an adaptive sliding window, and calculates the estimation coefficient under different measurement bands; The optimal estimation coefficient of the gas to be measured is obtained, the optimal measured concentration value of the gas to be measured is inverted, and the relative measurement error is calculated to verify the feasibility of the method; the invention eliminates the nonlinear effect in the gas measurement process based on the differential absorption spectroscopy technology, and solves the problem of It solves the difficult problem of calibration in gas measurement, improves the measurement accuracy, finally realizes the accurate measurement of unknown concentration gas, and at the same time expands the detection limit and realizes the dynamic measurement of gas.

Description

technical field [0001] The present application relates to the technical field of gas detection, in particular to a method for linear measurement of gas concentration based on adaptive band selection and differential absorption spectroscopy technology. Background technique [0002] In recent years, the excessive levels of suspended particulate matter in the atmosphere have led to smog weather, which in turn causes problems such as turbidity of the atmosphere, blurred vision, deterioration of visibility, and affecting the normal operation of human systems. The main components of smog are sulfur dioxide, nitrogen oxides and inhalable particulate matter. The gaseous pollutants mainly come from automobile exhaust and coal combustion, and the pollutants such as nitrogen oxides and metal oxide particles in the air are converted into , it is easy to cause environmental disasters such as the Maas Valley incident; the formation of acid rain causes soil acidification, corrodes building...

AI Technical Summary

Problems solved by technology

[0004] In current research results, when DOAS technology is used to measure polluted gases, some discrete wavelengths with obvious differential absorption structure and corresponding absorption lines are selected according to certain rules to invert the gas concentration. If the ratio is very low, the transmitted light intensity received by the spectrometer is weak, and there must be errors in the measured concentration value; for the full-spectrum measurement method, it is only suitable for the measurement of low-concentration gases. If the concentration is too high, it will lead to saturated absorption in the band with strong absorbance. phenomenon, resulting in measurement errors

Images