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Proceedings Paper

Mid-infrared photoacoustic spectroscopy for atmospheric NO2 measurements
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Paper Abstract

A photoacoustic (PA) sensor for spectroscopic measurements of NO2-N2 at ambient pressure and temperature is demonstrated. The PA sensor is pumped resonantly by a nanosecond pulsed single-mode mid-infrared (MIR) optical parametric oscillator (OPO). Spectroscopic measurements of NO2-N2 in the 3.25 μm to 3.55 μm wavelength region with a resolution bandwidth of 5 cm-1 and with a single shot detection limit of 1.6 ppmV (μmol/mol) is demonstrated. The measurements were conducted with a constant flow rate of 300 ml/min, thus demonstrating the suitability of the gas sensor for real time trace gas measurements. The acquired spectra is compared with data from the Hitran database and good agreement is found. An Allan deviation analysis shows that the detection limit at optimum integration time for the PAS sensor is 14 ppbV (nmol/mol) at 170 seconds of integration time, corresponding to a normalized noise equivalent absorption (NNEA) coefficient of 3.3×10-7 W cm-1 Hz-1/2.

Paper Details

Date Published: 22 February 2018
PDF: 7 pages
Proc. SPIE 10539, Photonic Instrumentation Engineering V, 105390J (22 February 2018); doi: 10.1117/12.2314125
Show Author Affiliations
Mikael Lassen, Danish Fundamental Metrology Institut (Denmark)
Laurent Lamard, LaserSpec BVBA (Belgium)
David Balslev-Harder, Danish Fundamental Metrology Institut (Denmark)
Andre Peremans, LaserSpec BVBA (Belgium)
Univ. of Namur (Belgium)
Jan C. Petersen, Danish Fundamental Metrology Institut (Denmark)

Published in SPIE Proceedings Vol. 10539:
Photonic Instrumentation Engineering V
Yakov G. Soskind, Editor(s)

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