Title :
Multimodal Interferometer Based on a Suspended Core Fiber for Simultaneous Measurement of Physical Parameters
Author :
Rota-Rodrigo, Sergio ; Lopez-Amo, Manuel ; Kobelke, Jens ; Schuster, Kay ; Santos, Jose Luis ; Frazao, Orlando
Author_Institution :
Dept. of Electron. & Electron. Eng., Univ. Publica de Navarra, Pamplona, Spain
Abstract :
In this study, a multimodal interferometer based on a suspended core photonic crystal fiber (PCF) for simultaneous strain and temperature measurements is proposed. The structure is also employed for angle measurements. The sensor comprises a 3-mm-suspended core PCF between SMFs and is based on the combination of two multimodal interferences with different frequency fringe patterns. The interferometric patterns show different sensitivity responses to strain and temperature. Through a low-pass frequency filtering of the detected spectrum, the wavelength shift of the two patterns can be measured allowing the discrimination of strain and temperature effects with resolutions of 0.45 °C and 4.02 με, respectively. The sensor is also characterized for angle measurements showing a maximum sensitivity of 9.17 pm/° in the range from 0° to 90°. It is demonstrated that with this sensing structure is possible to obtain simultaneous measurement of bend angle and temperature with resolutions of 1.69 ° and 0.92 °C, respectively.
Keywords :
angular measurement; fibre optic sensors; holey fibres; light interferometers; low-pass filters; photonic crystals; strain measurement; temperature measurement; SMF; angle measurements; bend angle; frequency fringe patterns; interferometric patterns; low-pass frequency filtering; multimodal interferometer; sensitivity responses; size 3 mm; strain measurements; suspended core PCF; suspended core photonic crystal fiber; temperature 0.45 degC; temperature 0.92 degC; temperature measurements; wavelength shift; Optical fiber sensors; Optical fibers; Photonic crystal fibers; Strain; Temperature measurement; Temperature sensors; Curvature sensor; Strain sensor; curvature sensor; fiber optic sensor; photonic crystal fiber; strain sensor; temperature sensor;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2014.2375896
