OPTICAL DEVICE FOR MEASURING A PHYSICAL PARAMETER IN A HYDROGEN CONTAMINATED SENSING ZONE

摘要

A signal processing apparatus which has an input for receiving a signal c onveying a response from first and second optical components to an optical e xcitation. The first and second optical components are in an optical sensor which is intended to be placed in a sensing zone. The sensing zone contains hydrogen susceptible to migrate into the optical sensor. The signal processi ng apparatus has a processing entity for processing the response from the fi rst and second optical components to derive information on hydrogen concentr ation in the optical sensor.