Journal
APPLIED PHYSICS LETTERS
Volume 113, Issue 17, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5049872
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Funding
- THORLABS GmbH, within the joint-research laboratory PolySense
- Welch Foundation [C0568]
- U.S. Army [W911SR-16-C-0005]
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We present a gas sensing system based on quartz-enhanced photoacoustic spectroscopy (QEPAS) employing a monolithic distributed-feedback quantum cascade laser (QCL) array operated in a pulsed mode as a light source. The array consists of 32 quantum cascade lasers emitting in a spectral range from 1190 cm(-1) to 1340 cm(-1). The optoacoustic detection module was composed of a custom quartz tuning fork with a prong spacing of 1 mm, coupled with two micro-resonator tubes to enhance the signal-to-noise ratio. The QEPAS sensor was validated by detecting the absorption of the P-and R-branches of nitrous oxide. The measurements were performed by switching the array QCLs in sequence while tuning their operating temperature to retrieve the fine structure of the two N2O branches. A sensor calibration was performed, demonstrating a linear responsivity for N2O: N-2 concentrations from 1000 down to 200 parts-per-million. With a 10 s lock-in integration time, a detection sensitivity of less than 60 parts-per-billion was achieved permitting the monitoring of nitrous oxide at global atmospheric levels. Published by AIP Publishing.
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