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Proceedings Paper

Optoelectronic system for NO2 detection
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Paper Abstract

This paper presents application of Cavity Ring-Down Spectroscopy (CRDS) and Cavity Enhanced Spectroscopic (CEAS) techniques with blue laser diodes-based system for nitrogen dioxide (NO2) detection. CES technique bases on integration of the light from a resonator. Since the integrated intensity is proportional to the decay time, the experimental signal can be related to the absorption process. The minimum detectable concentration of the absorber for a specific transition is inversely proportional to the effective sample-path length, and directly proportional to the minimum intensity fluctuation detected by a receiving system. In the presented system, the blue laser diode was mounted in a temperature-controlled housing. The light transmitted through the cavity was focused onto a PMT of H5783-03 type. The detector signal enters a lock-in amplifier and next a computer with a 16-bit data acquisition board.

Paper Details

Date Published: 14 October 2005
PDF: 6 pages
Proc. SPIE 5964, Detectors and Associated Signal Processing II, 59640Q (14 October 2005); doi: 10.1117/12.627422
Show Author Affiliations
Zbigniew Bielecki, Military Univ. of Technology (Poland)
Piotr Pregowski, PIRS Pregowski Infrared Services (Poland)
Jacek Wojtas, Military Univ. of Technology (Poland)

Published in SPIE Proceedings Vol. 5964:
Detectors and Associated Signal Processing II
Jean-Pierre Chatard; Peter N. J. Dennis, Editor(s)

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