Sub-ppt level detection of carbon monoxide and nitrous oxide enabled by mid-infrared doubly resonant photoacoustic spectroscopy.
Opt Lett
; 49(13): 3648-3651, 2024 Jul 01.
Article
em En
| MEDLINE
| ID: mdl-38950231
ABSTRACT
We report highly sensitive detection of carbon monoxide (CO) and nitrous oxide (N2O) using doubly resonant photoacoustic spectroscopy paired with a quantum cascade laser (QCL) at 4.57â
µm. The butterfly-packaged QCL is used to exploit the CO absorption line at 2190.02â
cm-1 and the N2O absorption line at 2191.42â
cm-1 by scanning the injection current. Leveraging the simultaneous acoustic and optical resonances and adopting a lower photoacoustic detection frequency, we achieve a minimum detection limit of 0.85â
part-per-trillion (ppt) for CO over the 500â
s averaging time, and 0.7â
ppt for N2O over the 200â
s averaging time. Our approach demonstrates record sensitivity for CO and N2O detection compared to state-of-the-art optical gas sensors.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Opt Lett
Ano de publicação:
2024
Tipo de documento:
Article
País de publicação:
EEUU
/
ESTADOS UNIDOS
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ESTADOS UNIDOS DA AMERICA
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EUA
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UNITED STATES
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UNITED STATES OF AMERICA
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US
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USA