Autonomous apparatus for reading an active chemical sensor using at least one optical fibre and method for its implementation

摘要

Modulated excitation means (34) excite an active chemical sensor (1) with several wavelengths; a synchronous detection (40) analyses the light power returned by the sensor (1); processing means (50) calculate, from the demodulated signals, the absorbence of the sensor (1) then determine the pH of the medium in which the sensor (1) is immersed by application of a relationship (R1): pH = pK - log (Amax - A DIVIDED A - Amin where pK, Amax, Amin are previously determined parameters, A being the absorbence of the sensor (1). Application to the measurement of pH and pCO2. IMAGE