Method for making an optical fibre chemical sensor comprising a coloured indicator,useful in particular for measuring nitric acid

摘要

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.