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  4. Integrated optical gas sensors using organically modified silicates as sensitive films
 
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1993
Journal Article
Title

Integrated optical gas sensors using organically modified silicates as sensitive films

Abstract
A new type of optical sensor for the detection of gases is proposed. The working principle is as follows: the gas to be measured is absorbed by a sensitive film, which changes its refractive index with gas absorption. The sensitive film is deposited onto an integrated optical interferometer. As the intensity distribution of waveguide modes is not totally confined to the waveguide, the interferometer phase changes with the refractive index of the film. Tests have been made with interferometers of Fabry-Perot and Mach-Zehnder type. Organically modified silicates are used as sensitive films. Films sensitive towards, eg. CO2 and SO2, have been tested under different gas atmospheres. The temperature dependence of the sensor signal and cross sensitivities towards other gases and humidity have been investigated. A sensor element has been fabricated that will be suitable for the detection of the threshold limit value of CO2.
Author(s)
Brandenburg, A.
Edelhäuser, R.
Hutter, F.
Journal
Sensors and Actuators. B  
DOI
10.1016/0925-4005(93)85276-G
Language
English
Fraunhofer-Institut für Silicatforschung ISC  
Keyword(s)
  • gas sensor

  • optical sensor

  • ormocere

  • sol-gel

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