MEASUREMENT OF FLUID CONCENTRATION

摘要

A system for operating an opto-luminescent chemical transducer which is adapted to generate, in response to an input of excitation light, an output radiation capable of absorption by an analyte, thereby to enable a concentration level of the analyte to be established, comprises: a source of cyclically-varying incident excitation light directed upon the transducer; a detector adapted to generate an output signal whose amplitude varies with time in accordance with intensity of output radiation generated by the transducer as a result of its opto-luminescence; and a phase detection module for determining phase of the output signal within a cycle of variation of the excitation light.