Open AccessReal-time calibration of laser absorption spectrometer using spectral correlation performed with an in-line gas cell
Author(s) -
Christian Smith,
Wen Wang,
Gerard Wysocki
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.022488
Subject(s) - spectrometer , optics , calibration , laser , trace gas , materials science , spectroscopy , quantum cascade laser , line (geometry) , tunable diode laser absorption spectroscopy , absorption spectroscopy , gas laser , sensitivity (control systems) , absorption (acoustics) , physics , tunable laser , geometry , mathematics , quantum mechanics , electronic engineering , meteorology , engineering
A real-time drift correction and calibration method using spectral correlation based on a revolving in-line gas cell for laser-based spectroscopic trace-gas measurements has been developed and evaluated experimentally. This technique is relatively simple to implement in laser spectroscopy systems and assures long-term stability of trace-gas measurements by minimizing the effects of external sources of drift in real-time. Spectroscopic sensitivity sufficient for environmental monitoring and effective drift suppression has been achieved for long-term measurements of CO₂ with a quantum cascade laser based spectrometer.