Two-point temperature sensor using an optical fiber-switching scheme

摘要

Abstract: A two-point optical fiber temperature sensor which makes use of a multimode 1 $MUL 2 fiber switch has been developed. It exploits the fluorescence decay of a Nd-doped glass as temperature sensing mechanism. The fluorescence responses from the Nd:glass probes are alternatively routed, via the optical switch, to a DSP which converts the fluorescence decay time into a modulation frequency proportional to it. The system, which demonstrates the feasibility of multi-point temperature sensing with a decay time-based approach, could be easily expanded to multiple- sensor configuration by means of a binary-tree scheme. The probes were tested in the temperature range 0$DGR@C to 250$DGR@C. The results of the tests and the calibration of one probe are reported.!10