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Phase-locked optical fiber fluorescence temperature sensor based on double-reference light sources

A phase-locked optical-fiber fluorescence temperature sensor based on double-reference light sources is proposed, which results in a significant improvement in the measurement resolution. The system uses the methods of phase-locked, frequency modulation and phase modulation. The double-reference light sources is used to solve the leakage of intrinsic exciting light which has influence on fluorescence decay signal. Ruby of fluorescent substance is used as sensor material in the system. The probe is tested in the temperature range from 0°C to 200°C. The experimental result shows that the system of measurement temperature is feasible and also proposed to be used for the highly accurate monitoring of the real time.