2006•Optical TechniqueRequires access

Study on the arithmetic of trace gas concentration based on tunable diode absorption spectroscopy

Dong Feng-zhong

Abstract

Gas analyzers based on tunable diode-laser absorption spectroscopy(TDLAS) is provide with high sensitivity,fast response and highly specific in situ measurement of atmospheric trace gases.Characteristics of the second harmonic signal with TDLAS were analyzed.A method of the linear least-squares fitting used to deal with second harmonic signal of the measured trace gas based on the signal of high concentration was presented.The concentrations of trace gases were obtained with highly precision.The relationship between concentrations and the correlation coefficient was studied.Some measurements of methane were presented and discussed.

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Key concepts: Tunable diode laser absorption spectroscopy, Trace gas, Harmonic, Absorption spectroscopy, Analytical Chemistry (journal), Spectroscopy, SIGNAL (programming language), Absorption (acoustics)