N2O Detection With The CEAS Method
Author(s)
J. Wojtas, B. Rutecka, T. Stacewicz, J. Mikolajczyk
& Z. Bielecki
Abstract
Nitrous oxide (N2O) plays a significant role in many different fields therefore its
monitoring is an important task. In this paper the opportunity of application of
cavity enhanced absorption spectroscopy for N2O detection is presented. This
method is a modification of cavity ring down spectroscopy. The laser radiation
tuned to absorption line of N2O is injected into an optical cavity under a very
small angle in respect to its axis. In the case of lack of the absorption, the result
is determined by the mirrors reflectivity coefficient, diffraction losses and length
of the cavity. When the absorber is present in the cavity, the result additionally
depends on absorption and scattering of light in cavity. The method provides the
determination of a very weak absorption coefficient as well as the concentration
of the absorbing gas.
Our N2O sensor consisted of a pulsed radiation source, optical cavity,
detection module and a digital oscilloscope. As the light source anoptical
parametric generator was applied. It enabled the wavelength tuning in a broad
spectral range with resolution of 1 nm. The optical cavity was composed of two
high-reflective spherical mirrors. Optical signal registration was done with
detection module equipped with HgCdTe photodetector.
The spectral range of 4.52–4.53 μm is the best for N2O detection. Operation
at these wavelengths provides opportunity avoiding of interferences with other
atmosphere gases, like CO2 and H2O. Assuming 2% uncertainty of
measurements and the effective value of the absorption cross section of about
6·10-19 cm2 the detection limit of 10 ppb was achieved.
Keywords: CEAS, N2O detection, optoelectronic sensor.
Keywords
CEAS, N2O detection, optoelectronic sensor
Related Book
Other papers in this volume
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