Signal processing and calibration procedures for in situ diode-laser absorption spectroscopy

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Peter WerleF Slemr

Abstract

Gas analyzers based on tunable diode-laser spectroscopy (TDLS) provide high sensitivity, fast response and highly specific in situ measurements of several atmospheric trace gases simultaneously. Under optimum conditions even a shot noise limited performance can be obtained. For field applications outside the laboratory practical limitations are important. At ambient mixing ratios below a few parts-per-billion spectrometers become more and more sensitive towards noise, interference, drift effects and background changes associated with low level signals. It is the purpose of this review to address some of the problems which are encountered at these low levels and to describe a signal processing strategy for trace gas monitoring and a concept for in situ system calibration applicable for tunable diode-laser spectroscopy. To meet the requirement of quality assurance for field measurements and monitoring applications, procedures to check the linearity according to International Standard Organization regulations are described and some measurements of calibration functions are presented and discussed.

References

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Citations

Mar 18, 2006·Isotopes in Environmental and Health Studies·Peter WerleFrancesco D'amato
Feb 28, 2006·Isotopes in Environmental and Health Studies·Hans-Jürg JostH William Wilson
May 13, 2009·Analytical and Bioanalytical Chemistry·Timothy J JohnsonThomas A Blake
May 2, 2008·Applied Optics·Xiutao LouZhiguo Zhang
Jul 2, 2005·Applied Optics·Johan HultClemens F Kaminski
Sep 23, 2014·Applied Spectroscopy·Lizhu ZhangBenli Yu
May 6, 2019·Optics Express·Johannes P WaclawekBernhard Lendl
Dec 29, 2020·Critical Reviews in Analytical Chemistry·María José CardadorVicente Rodríguez-Estévez
May 21, 2021·Annual Review of Analytical Chemistry·Gérard Liger-Belair, Clara Cilindre

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