Nitrogen Dioxide Detection Using An
Optoelectronic Sensor
Author(s)
Z. Bielecki, W. Kołosowski, G. Różański, E. Sędek
& J. Wojtas
Abstract
Sensitive laser absorption spectroscopy requires a long effective pathlength of
the laser beam in the analyzed media. Traditionally, this requirement is satisfied
using an optical multipass cell. We present the opportunities of detection of
nitrogen dioxide using cavity enhanced spectroscopies. These techniques can be
applied for construction of a fully optoelectronic NO2 sensor with a detection
limit better than 1 ppb. The setup usually includes the resonance optical cavity,
which is equipped with spherical and high reflectance mirrors, the pulsed or cw
laser and a photomultiplier which is connected with the digital oscilloscope or
with others digitizers. The optical signal leaving a cavity can be used to
determine an absorption coefficient of the intracavity medium.
Keywords: optoelectronic sensor, absorption spectroscopy.
1 Introduction
Nitrogen dioxide is one of the most important factors in atmosphere quality. At
present, NO2 is commonly detected using the methods based on
chemiluminescence. Their sensitivity reaches single ppb.
Laser absorption spectroscopy is an effective tool in studies of gaseous
species. The Beer-Lambert law for week absorption indicates that the minimum
detectable concentration of absorbers is inversely proportional to the effective
sample-path length, and directly proportional to the minimum intensity
fluctuation detected by a photodetector. In order to increase the absorption
sensitivity, the optical path through the absorber should be maximised and the
relative-intensity variations should be minimised.
Keywords
optoelectronic sensor, absorption spectroscopy.
Related Book
Other papers in this volume
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