Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 100, Issue 1, Pages 125-130Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00340-010-3984-z
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Funding
- Regione Puglia
- II. Faculty of Engineering of the Politecnico di Bari
- National Science Foundation Engineering Research Center
- Princeton University
- Welch Foundation [C-0586]
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A gas sensor based on quartz-enhanced photoacoustic detection and an external cavity quantum cascade laser was realized and characterized for trace nitric oxide monitoring using the NO R(6.5) absorption doublet at 1900.075 cm(-1). Signal and noise dependence on gas pressure were studied to optimize sensor performance. The NO concentration resulting in a noise-equivalent signal was found to be 15 parts per billion by volume, with 100 mW optical excitation power and a data acquisition time of 5 s.
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