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22 February 2018 Mid-infrared photoacoustic spectroscopy for atmospheric NO2 measurements
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Proceedings Volume 10539, Photonic Instrumentation Engineering V; 105390J (2018)
Event: SPIE OPTO, 2018, San Francisco, California, United States
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.
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Mikael Lassen, Laurent Lamard, David Balslev-Harder, Andre Peremans, and Jan C. Petersen "Mid-infrared photoacoustic spectroscopy for atmospheric NO2 measurements", Proc. SPIE 10539, Photonic Instrumentation Engineering V, 105390J (22 February 2018);

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