Sub-ppbv nitric oxide concentration measurements using cw thermoelectrically cooled quantum cascade laser-based integrated cavity output spectroscopy
A nitric oxide (NO) gas sensor based on a thermoelectrically cooled, continuous-wave, distributed feedback quantum cascade laser operating at 5.45 μm (1835 cm-1) and off-axis integrated cavity output spectroscopy combined with a wavelength-modulation technique was developed to determine NO concentrations at the sub-ppbv levels that are essential for a number of applications, such as medical diagnostics, environmental monitoring, and industrial process control. The sensor employs a 50-cm-long high-finesse optical cavity that provides an effective path length of ∼700 m. A noise equivalent (SNR=1) minimum detection limit of 0.7 ppbv with a 1-s observation time was achieved.
Unable to display preview. Download preview PDF.
- 2.Steinfeld JH, Pandis SN (1998) Atmospheric Chemistry and Physics: From Air Pollution to Climate Change. Wiley, New YorkGoogle Scholar
- 7.Amann A, Smith D (eds) (2005) Breath Analysis for Clinical Diagnosis and Therapeutic Monitoring. World Scientific, Singapore , pp 75–84Google Scholar
- 10.S. Blaser, Y. Bonetti, L. Hvozdara, A. Mueller, Quantum-cascade lasers for TDLS. In 5th International Conference on Tunable Diode Laser Spectroscopy, Florence, Italy, 11–15 July 2005Google Scholar
- 15.Paldus BA, Kachanov AA, Spectroscopic techniques: cavity-enhanced methods. In Atomic, Molecular, and Optical Physics Handbook, Part C: Molecules, ed. by Drake GWF (Springer, Berlin 2005), Chap. 43, p. 621Google Scholar