Method for determining no gas
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United States of America Patent
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Nov 11, 2003
Grant Date -
N/A
app pub date -
Dec 10, 1999
filing date -
Jun 18, 1994
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical sensor for detection of gases such as nitrogen oxides includes a thin film of an active material comprising a highly polarisable organic material deposited by the Langmuir-Blodgett technique or otherwise on a substrate and interrogated optically, to detect changes in at least one optical property such as reflectance or complex refractive index. Preferred materials include a specific polysiloxane and low-molecular-mass compounds (FIGS 1 to 5b), having specific electron donating and/or accepting groups, including azobenzenes. The optical change may include a visible colour change.
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