Abstract

We applied for the first time, to our knowledge, broadband off-beam quartz-enhanced photoacoustic spectroscopy (BB-OB-QEPAS) to trace NO2 detection using a broadband blue laser diode centered at 450nm. A detection limit of 18ppbv (parts in 109 by volume) for NO2 in N2 at atmospheric pressure was achieved with an average laser power of 7mW at a 1s integration time, which corresponds to a 1σ normalized noise equivalent absorption coefficient of 4.1×109cm1W/Hz1/2. An Allan variance analysis was performed to investigate the long-term stability of the BB-OB-QEPAS-based NO2 sensor.

© 2011 Optical Society of America

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