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Ultra-sensitive carbon monoxide detection by using EC-QCL based quartz-enhanced photoacoustic spectroscopy (Springer Link)

Abstract

A quartz-enhanced photoacoustic spectroscopy (QEPAS) based sensor for carbon
monoxide detection at ppbv levels was developed with a 4.65 μm external-cavity
quantum cascade laser operating both in continuous wave (cw) and pulsed modes.
A 23-fold enhancement of the measured CO signal amplitude was obtained when
water vapor, acting as a catalyst for vibrational energy transfer, was added
to the targeted analyte mixture. In the cw mode, a noise-equivalent
sensitivity (NES, 1_σ_) of 2 ppbv was achieved at a gas pressure of 100 Torr,
for 1-s lock-in amplifier (LIA) time constant (TC), which corresponds to a
normalized noise equivalent absorption coefficient (NNEA) of . In the pulsed
mode, the determined NES and NNEA were 46 ppbv and , respectively, for a 3-ms
LIA TC at atmospheric pressure with a laser scan rate of 18 cm-1/s and a 50 %
duty cycle. An intercomparison between cw and pulsed QEPAS-based CO detection
is also reported.

* Content Type Journal Article

* Pages 1-9

* DOI 10.1007/s00340-012-4949-1

* Authors

* L. Dong, Department of Electrical and Computer Engineering, Rice
University, 6100 Main Street, Houston, TX 77005, USA

...

Springer Link

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