Abstract

We applied for the first time, to our knowledge, broadband off-beam quartz-enhanced photoacoustic spectroscopy (BB-OB-QEPAS) to trace ${\mathrm{NO}}_2$ detection using a broadband blue laser diode centered at $450\mathrm{nm}$. A detection limit of $18\mathrm{ppbv}$ (parts in ${10}^9$ by volume) for ${\mathrm{NO}}_2$ in ${\mathrm{N}}_2$ at atmospheric pressure was achieved with an average laser power of $7\mathrm{mW}$ at a $1\mathrm{s}$ integration time, which corresponds to a $1\mathrm{\sigma }$ normalized noise equivalent absorption coefficient of $4.1\times {10}^{-9}{\mathrm{cm}}^{-1}\mathrm{W}/{\mathrm{Hz}}^{1/2}$. An Allan variance analysis was performed to investigate the long-term stability of the BB-OB-QEPAS-based ${\mathrm{NO}}_2$ sensor.

© 2011 Optical Society of America

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