| Volumes and Issues Contents of Issue 1 |
www.atmos-meas-tech.net/2/1/2009/
doi:10.5194/amt-2-1-2009
© Author(s) 2009. This work is distributed
under the Creative Commons Attribution 3.0 License.
A cavity ring down/cavity enhanced absorption device for measurement of ambient NO3 and N2O5
1Max-Planck-Institut für Chemie, Mainz, Germany
*now at: NXP Semiconductors, Nijmegen, The Netherlands
Abstract. An inexpensive, compact instrument for the sensitive measurement of NO3 and N2O5 in ambient air at high time resolution is described. Light from a red-emitting laser diode (≈662 nm) is coupled off-axis into an optical resonator defined by two highly reflective mirrors to achieve effective absorption paths exceeding 20 km. Light leaking from the cavity is detected either as single ring-down events (time constant of ≈100 μs) following rapid switching of the laser intensity at 200 Hz (Cavity Ring Down mode), or as an integrated intensity (Cavity Enhanced Absorption mode). The operational conditions, detection limits (2 pptv in 5 s) and total uncertainty (<15% for NO3<10 pptv) for the prototype device for NO3 and N2O5 detection/monitoring are assessed and the first measurements in ambient air and from an environmental chamber are described.
Final Revised Paper (PDF, 727 KB) Discussion Paper (AMTD)
Citation: Schuster, G., Labazan, I., and Crowley, J. N.: A cavity ring down/cavity enhanced absorption device for measurement of ambient NO3 and N2O5, Atmos. Meas. Tech., 2, 1-13, doi:10.5194/amt-2-1-2009, 2009. Bibtex EndNote Reference Manager XML
