A Miniaturized Optical Fiber Tip High-Temperature Sensor based on Concave-Shaped Fabry-Perot Cavity


We present a miniaturized optical fiber tip Fabry-Perot interferometer for high-temperature measurement based on a concave-shaped cavity. The fabrication process of the diaphragm-free Fabry-Perot cavity is quite simple, involving only two steps: fusion splicing and cleaving. By adjusting the arc power during fusion splicing, a concave-shaped structure is obtained, through which the light is coupled/split into the wall of the spliced hollow core fiber. By cleaving the end-face of the hollow-core fiber, a concave-shaped diaphragm-free Fabry-Perot interferometer is formed. The temperature response of the sensor was demonstrated, showing a high-temperature tolerance up to 1000 °C and a sensitivity of 0.01226 nm/°C. The proposed sensor, with all-silica-structure, high compactness, robustness, and ease of fabrication, could find wide applications in high-temperature harsh environments.


Electrical and Computer Engineering

Research Center/Lab(s)

Intelligent Systems Center

Keywords and Phrases

Cable jointing; Cavity resonators; Composite structures; Diaphragms; Fiber optic sensors; High temperature applications; Optical fiber fabrication; Optical fibers; Silica; Structure (composition); Temperature measurement; Temperature sensors; Wave interference; Extrinsic Fabry Perot interferometer; Fabrication process; Fiber gratings; High temperature; High temperature measurement; High temperature sensors; Hollow core fiber; Temperature response; Fabry-Perot interferometers; Extrinsic Fabry-Perot interferometer; High-temperature; Optical fiber sensor

International Standard Serial Number (ISSN)


Document Type

Article - Journal

Document Version


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© 2019 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Jan 2019