Wavelength modulation spectroscopy for recovering absolute absorbance | Zendy

Yanjun Du | Zendy; Zhimin Peng | Zendy; Yanjun Ding | Zendy

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Wavelength modulation spectroscopy for recovering absolute absorbance

Author(s) -

Yanjun Du,

Zhimin Peng,

Yanjun Ding

Publication year - 2018

Publication title -

optics express

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.26.009263

Subject(s) - absorbance , optics , materials science , spectroscopy , calibration , wavelength , modulation (music) , tunable diode laser absorption spectroscopy , sensitivity (control systems) , absorption spectroscopy , laser , absorption (acoustics) , noise (video) , residual , tunable laser , physics , computer science , electronic engineering , algorithm , quantum mechanics , artificial intelligence , acoustics , image (mathematics) , engineering

A highly sensitive, calibration-free method, wavelength modulation - direct absorption spectroscopy (WM-DAS), is proposed by extracting the characteristic frequencies of modulated laser intensity. This method combines the advantages of measuring absolute absorbance profile from calibration-free DAS with the enhanced noise rejection and high sensitivity of WMS. The preliminary validation experiment of H 2 O transitions shows that the WM-DAS method improves the accuracy of the absorbance profile measurement with a best-fit standard residual of 4.9 × 10 -5 . This new method might inspire new approaches to high-precision measurement of spectral line parameters and gas information with weak absorptions or industrial applications.

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