Abstract
This paper proposes and demonstrates an integrated optical fiber sensor, which combines Fabry-Perot interference (FPI) and surface plasmon resonance (SPR) to measure the thermo-optical coefficient of liquid samples. SPR is excited by the total reflection of light on the capillary fiber wall and the reflected light on the two reflective surfaces of the Fabry-Perot (FP) cavity to produce FPI. Two sensing units measure temperature and refractive index (RI), respectively. This sensor not only separates two sensing wavebands but also solves the inherent cross-sensitivity problems. The SPR sensing unit has a sensitivity of 2565.4 nm/RIU, and its sensing waveband range is 500−900 nm. The FPI sensing unit has a sensitivity of 394.3 pm/°C, and its sensing waveband range is 1500−1600 nm. The measurement range of RI is 1.333–1.393, and the measurement range of temperature is 20 °C–80 °C. We verify the feasibility of the sensor in various liquid samples. The experimental results indicate that the measured value of the thermo-optical coefficient agrees with the theoretical value. The measurement error of the thermo-optical coefficient of absolute ethanol is about 0.51 %. This research provides a novel insight into solving the inherent cross-sensitivity problems and how to separate the sensing wavebands.
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