City Research Online

Abstract

An innovative vibration sensor based on a Fabry-Perot Interferometer (FPI) using Fiber Bragg Grating (FBG) reflectors has been discussed in this work. The sensor has been designed to be compact and easy to fabricate and independent of temperature, to overcome limitations seen in some previous designs, providing an effective correction for temperature effects in FBG-based FPI (FBG-FPI) sensors. In this approach, light from a broadband source in the wavelength range 1500 – 1580 nm has been used to illuminate the FBGs used (having a reflective peak of 1547.42 nm), employing in this way a light source within the FPI optimum wavelength operating range of 1547.15 nm – 1547.80 nm. The sensor developed in this work has been shown able to capture a 3 kHz burst signal from a signal generator, in 1 Hz, 2 Hz, and 3 Hz intervals. In addition, the research carried out has revealed that the sensor could be used to capture sinusoidal signals at frequencies up to 9 kHz, creating a performance comparable with many existing conventional piezoelectric sensors. The ability to operate regardless of any ambient temperature changes (in the range from 26.5°C (room temperature) up until 80°C), opens the way to use such a sensor system over a wide range of engineering applications taking advantage of the next generation of FBG-based FPIs.

Publication Type:	Article
Additional Information:	Copyright, that authors, 2022, Society of Photo‑Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this publication for a fee or for commercial purposes, and modification of the contents of the publication are prohibited.
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments:	School of Science & Technology > Engineering
SWORD Depositor:	Symplectic Administrator

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