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Sensors 2018, 18(1), 301; https://doi.org/10.3390/s18010301

A Polymer Optical Fiber Temperature Sensor Based on Material Features

1
Graduate Program of Electrical Engineering, Federal University of Espirito Santo, Vitória-ES 29075-910, Brazil
2
Instituto de Telecomunicações and Physics Department & I3N, University of Aveiro, 3810-193 Aveiro, Portugal
*
Author to whom correspondence should be addressed.
Received: 30 November 2017 / Revised: 12 January 2018 / Accepted: 16 January 2018 / Published: 19 January 2018
(This article belongs to the Section Physical Sensors)
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Abstract

This paper presents a polymer optical fiber (POF)-based temperature sensor. The operation principle of the sensor is the variation in the POF mechanical properties with the temperature variation. Such mechanical property variation leads to a variation in the POF output power when a constant stress is applied to the fiber due to the stress-optical effect. The fiber mechanical properties are characterized through a dynamic mechanical analysis, and the output power variation with different temperatures is measured. The stress is applied to the fiber by means of a 180° curvature, and supports are positioned on the fiber to inhibit the variation in its curvature with the temperature variation. Results show that the sensor proposed has a sensitivity of 1.04 × 10−3 °C−1, a linearity of 0.994, and a root mean squared error of 1.48 °C, which indicates a relative error of below 2%, which is lower than the ones obtained for intensity-variation-based temperature sensors. Furthermore, the sensor is able to operate at temperatures up to 110 °C, which is higher than the ones obtained for similar POF sensors in the literature. View Full-Text
Keywords: polymer optical fiber; temperature sensor; dynamic mechanical analysis polymer optical fiber; temperature sensor; dynamic mechanical analysis
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Leal-Junior, A.; Frizera-Neto, A.; Marques, C.; Pontes, M.J. A Polymer Optical Fiber Temperature Sensor Based on Material Features. Sensors 2018, 18, 301.

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