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Compact open-path detection of N2O gas with low concentration of ppb level based on QCL
Conference proceeding

Compact open-path detection of N2O gas with low concentration of ppb level based on QCL

Byoung-Uk Sohn, Peng Xing, Dawn T. H. Tan and IEEE
CLEO-PR : 2017 Conference on Lasers and Electro-Optics Pacific Rim : July 31, 2017-August 4, 2017, Vol.2017-, pp.1-2
07/2017
DOI: https://doi.org/10.1109/CLEOPR.2017.8118802

Abstract

Absorption Gas lasers Gas sensing Laser beams Laser noise mid-IR Nitrous Oxide Photonics quantum cascade laser Quantum cascade lasers Sensors
We measured nitrous oxide (N 2 O) gas at concentrations as low as 2ppb using a multi-pass gas cell (MPGC) with an path length of 10m. The quantum cascade laser (QCL) was spectrally scanned in the range of 4529.4nm-4531nm having the strongest linear absorption cross-section of 3.6710 -18 cm 2 , where the spectral absorption region of CO and CO 2 is avoided. The absorption levels at spectral lines of 4529.80nm and 4530.22nm were measured to demonstrate a relation with variation of concentration of N 2 O. This strategy could be used in low power of laser with a limit of power detector because we are using linear absorption phenomena.

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