Abstract
A capillary encapsulated fiber optic surface plasmon resonance (SPR) temperature sensor was prepared and analyzed in this paper. The properties of sensors with different filling materials and different capillaries were measured and compared. Finally, polydimethylsiloxane was selected as the filling material and the brass tube was selected as the encapsulated capillary for temperature sensing. Experimental results demonstrated that the sensitivity of the fiber optic SPR temperature sensor could be −1.87 nm °C−1, and the sensor showed good stability, reliable repeatability, and good reversibility. In addition, the encapsulation of the sensor with brass capillary tube also enhanced the protection of the sensor probe and improved the mechanical strength of the sensor, so that it can be well applied in practical measurement.
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