Method for determining no gas
US6645771B1 · kind B1 · utility
1Cited by
3References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1999 |
| Grant date | Nov 11, 2003 |
| Priority date | — |
| Expiry date | Dec 10, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/177692
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.