Investigation of a hybrid FBG sensing system for multi-parameters detection

• Published in: Optical fiber technology Vol. 83; p. 103679
• Main Authors: Yu, Yi-Lin, Huang, Ming-Huei, Chen, Yong-Ji, Teng, Chun-Yao, Wang, Yu-Lin, Kishikawa, Hiroki, Oguchi, Kimio
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.03.2024
• Subjects: Fiber Bragg grating; Fiber sensor; Silicon core fiber; Silicon core fiber; Fiber sensor; Fiber Bragg grating
• ISSN: 1068-5200; 1095-9912
• DOI: 10.1016/j.yofte.2024.103679

•We designed a fiber sensor system comprising fused silica fiber Bragg grating and silicon core fiber-based fiber Bragg grating.•A hybrid fiber Bragg grating sensor system was proposed, employing only two sensing devices to detect three different environmental targets.•Our focus was solely on addressing the connection between two distinct fibers, namely fused silica and silicon core fiber. We discussed the associated loss and spectral distortion issues. In this article, we introduce a multi-parameter fiber sensor system that utilizes a hybrid FBG design. The design combines a fused silica fiber Bragg grating and a fiber Bragg grating based on a silicon core fiber. This combination enables the sensor to detect surrounding temperature, water level, and refractive index. The sensor successfully measured temperature within the range of 10 to 40 °C, water level within the range of 40 to 140 cm, and refractive index within the range of 1.2 to 1.4. These ranges exhibit a high level of linearity within the proposed sensing range. Additionally, we discuss the challenges associated with connecting the fused silica fiber and the silicon core fiber.