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Sensors 2017, 17(9), 2129;

Tilted Fiber Bragg Grating Sensor with Graphene Oxide Coating for Humidity Sensing

Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, No. 415, Jiangong Rd., Sanmin Dist., Kaohsiung 807, Taiwan
Department of Aeronautical and Mechanical Engineering, Air Force Academy, Kaohsiung 807, Taiwan
Author to whom correspondence should be addressed.
Received: 8 August 2017 / Revised: 8 September 2017 / Accepted: 14 September 2017 / Published: 15 September 2017
(This article belongs to the Special Issue Selected Papers from IEEE ICASI 2017)
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In this study, we propose a tilted fiber Bragg grating (TFBG) humidity sensor fabricated using the phase mask method to produce a TFBG that was then etched with five different diameters of 20, 35, 50, 55 and 60 μm, after which piezoelectric inkjet technology was used to coat the grating with graphene oxide. According to the experimental results, the diameter of 20 μm yielded the best sensitivity. In addition, the experimental results showed that the wavelength sensitivity was −0.01 nm/%RH and the linearity was 0.996. Furthermore, the measurement results showed that when the relative humidity was increased, the refractive index of the sensor was decreased, meaning that the TFBG cladding mode spectrum wavelength was shifted. Therefore, the proposed graphene oxide film TFBG humidity sensor has good potential to be an effective relative humidity monitor. View Full-Text
Keywords: humidity sensor; tilted fiber Bragg grating; graphene oxide humidity sensor; tilted fiber Bragg grating; graphene oxide

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Chiu, Y.-D.; Wu, C.-W.; Chiang, C.-C. Tilted Fiber Bragg Grating Sensor with Graphene Oxide Coating for Humidity Sensing. Sensors 2017, 17, 2129.

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