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Sensors 2017, 17(12), 2922; https://doi.org/10.3390/s17122922

A Highly Sensitive Two-Dimensional Inclinometer Based on Two Etched Chirped-Fiber-Grating Arrays

1
Program of Electrical and Communications Engineering, Feng-Chia University, 100 Wenhwa Rd., Seatwen, Taichung 40724, Taiwan
2
Department of Electrical Engineering, National Changhua University of Education, 2 Shida Rd., Changhua 50074, Taiwan
3
Department of Electrical Engineering, Feng-Chia University, 100 Wenhwa Rd., Seatwen, Taichung 40724, Taiwan
This paper is an expanded version based on the idea presented in the Conference on Lasers and Electro-Optics, San Jose, CA, USA, 9 June 2016.
*
Author to whom correspondence should be addressed.
Received: 29 October 2017 / Revised: 5 December 2017 / Accepted: 13 December 2017 / Published: 15 December 2017
(This article belongs to the Section Physical Sensors)
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Abstract

We present a novel two-dimensional fiber-optic inclinometer with high sensitivity by crisscrossing two etched chirped fiber Bragg gratings (CFBG) arrays. Each array is composed of two symmetrically-arranged CFBGs. By etching away most of the claddings of the CFBGs to expose the evanescent wave, the reflection spectra are highly sensitive to the surrounding index change. When we immerse only part of the CFBG in liquid, the effective index difference induces a superposition peak in the refection spectrum. By interrogating the peak wavelengths of the CFBGs, we can deduce the tilt angle and direction simultaneously. The inclinometer has a resolution of 0.003° in tilt angle measurement and 0.00187 rad in tilt direction measurement. Due to the unique sensing mechanism, the sensor is temperature insensitive. This sensor can be useful in long term continuous monitoring of inclination or in real-time feedback control of tilt angles, especially in harsh environments with violent temperature variation. View Full-Text
Keywords: etched fiber Bragg grating; chirped fiber Bragg grating (CFBG); level meter; inclinometer; tilt meter; fiber sensor etched fiber Bragg grating; chirped fiber Bragg grating (CFBG); level meter; inclinometer; tilt meter; fiber sensor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Chang, H.-Y.; Chang, Y.-C.; Liu, W.-F. A Highly Sensitive Two-Dimensional Inclinometer Based on Two Etched Chirped-Fiber-Grating Arrays. Sensors 2017, 17, 2922.

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