PACS 05.40.Ca, 07.07.Df, 42.25.Bs, 42.62.-b, 42.82.-m, 89.60.-k
Analysis of sensitivity of an integrated-optical sensor of
gaseous substances in the presence of an additive statistic noise
A.A. Egorov,1
T.K. Chekhlova,2 V.I. Grygoruk,3 A.V. Kovalenko3
1 A.M. Prokhorov General
Physics Institute, Russian Academy of Sciences
2 Peoples' Friendship
University of Russia
3 Taras Shevchenko
National University of Kyiv
Received September 8, 2010
Abstract.
The
dependence of the sensitivity of an integrated-optical waveguide sensor on the
length of a waveguide sensor cell, efficiency of input of the laser radiation in
a waveguide,
absorption
cross-section and a level of an additive statistic noise is analyzed. On data of
the computer modeling it is established, that the integrated-optical sensor of
the given type can find out the contents of gaseous ammonia in the air with the
limiting theoretical concentration about 0.1 ppm for an absorption cross-section
of researched substance 4∙10-16
ρμ2,
the magnitude of the a signal-to-noise relation about 20, length of a sensor
cell approximately 4 cm, efficiency of input of a laser radiation in a waveguide
not less than 40%.
Keywords: integral optical sensor, chemical sensor,
laser radiation, gaseous matter, numerical simulation, random noise.