Highly Sensitive, Calibration-Free WM-DAS Method for Recovering Absorbance-Part I: Theoretical Analysis.

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ID: 89329
2020
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Abstract
The absorbance is of great importance in the tunable diode laser absorption spectroscopy (TDLAS) as it contains information of both gas properties and spectroscopic parameters. A novel, calibration-free wavelength modulation-direct absorption spectroscopy (WM-DAS) is proposed and experimentally verified in this two-part paper. This method combines the capability of absorbance measurement from DAS and the advantages of enhanced noise rejection and high sensitivity from WMS. In this , we focus on the full theoretical basis and procedures of this method from the following three aspects: the high-accuracy characterizations of laser frequency and intensity, noise rejection ability by extracting the characteristic spectra through the fast Fourier transform (FFT) of the light intensity, and the simultaneous fitting strategy for both baseline and absorbance. The preliminary validation experiment of CO transition at 4300.6999 cm in a static gas cell shows the high accuracy of the proposed method.
Reference Key
peng2020highlysensors Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Peng, Zhimin;Du, Yanjun;Ding, Yanjun;
Journal sensors
Year 2020
DOI
E681
URL
Keywords
spectroscopic parameters absorbance calibration-free fast-fourier transform gas temperature and concentration tunable diode laser absorption spectroscopy

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