Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 117, Issue 1, Pages 245-251Publisher
SPRINGER
DOI: 10.1007/s00340-014-5828-8
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Funding
- National Science Foundation (NSF) ERC MIR-THE award
- NSF-ANR award for international collaboration in chemistry
- Next generation of Compact Infrared Laser based Sensor for Environmental Monitoring (NexCILAS)
- Robert Welch Foundation [C-0586]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1124677] Funding Source: National Science Foundation
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A quantum cascade laser (QCL)-based absorption sensor for the simultaneous dual-species monitoring of CH4 and N2O was developed using a novel compact multipass gas cell (MGC). This sensor uses a thermoelectrically cooled, continuous wave, distributed feedback QCL operating at similar to 7.8 A mu m. The QCL wavelength was scanned over two neighboring CH4 (1275.04 cm(-1)) and N2O (1274.61 cm(-1)) lines at a 1 Hz repetition rate. Wavelength modulation spectroscopy (f = 10 kHz) with second harmonic (2f) detection was performed to enhance the signal-to-noise ratio. An ultra-compact MGC (16.9 cm long and a 225 ml sampling volume) was utilized to achieve an effective optical path length of 57.6 m. With such a sensor configuration, a detection limit of 5.9 ppb for CH4 and 2.6 ppb for N2O was achieved, respectively, at 1-s averaging time.
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