Method for making an optical fiber chemical sensor comprising a colored indicator, useful in particular for measuring nitric acid
US6864095B2 · kind B2 · utility
1Cited by
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16Claims
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Key dates
| Filing date | Aug 21, 2001 |
| Grant date | Mar 8, 2005 |
| Priority date | — |
| Expiry date | Jul 21, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T436/2525
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention concerns the production of a chemical sensor which can be used to measure nitric acidity.This sensor is produced using a sol-gel method for depositing a porous film, containing a colored indicator, on the core of an optic fiber. The pH of the initial sol is adjusted as are other conditions for implementing the sol-gel method to obtain stability of the signal (curves 1 to 4) emitted by the sensor in an 8N nitric medium for at least 1000 hours.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.