Applied Physics B

, Volume 103, Issue 2, pp 451–459

Faraday rotation spectrometer with sub-second response time for detection of nitric oxide using a cw DFB quantum cascade laser at 5.33 μm

  • P. Kluczynski
  • S. Lundqvist
  • J. Westberg
  • O. Axner
Article

Abstract

A Faraday modulation spectrometer for sensitive and fast detection of nitric oxide at 5.33 μm utilizing a room temperature continuous wave distributed feedback quantum cascade laser and a Peltier cooled MCT detector is presented. The magnetic field was modulated at 7.4 kHz whereas the laser wavelength was scanned at 20 Hz across the most favorable rotational-vibrational transition for FAMOS, Q3/2(3/2), at 5.33 μm. Using a 15 cm optical path and lineshape fitting, the spectrometer provides a detection limit of 4.5 ppb for a response time of 1 s. An Allan variance analysis demonstrates that the system has an excellent stability, up to several hours of operation.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • P. Kluczynski
    • 1
  • S. Lundqvist
    • 1
  • J. Westberg
    • 2
  • O. Axner
    • 2
  1. 1.IIA SLA R&DSiemens ABGöteborgSweden
  2. 2.Department of PhysicsUmeå UniversityUmeåSweden

Personalised recommendations