A Temperature Independent Inclinometer Based on a Tapered Fiber Bragg Grating in a Fiber Ring Laser

Abstract

We demonstrate a new concept for an all-fiber inclinometer based on a tapered fiber Bragg grating (tFBG) in a fiber ring laser (FRL) with the capability of measuring the tilt angle and temperature simultaneously. The sensor performance is analyzed theoretically and investigated experimentally. The dependence of tilt angle on the spectral response in variable temperature conditions was measured. Two inclinometers with different lengths have been fabricated and characterized in FRL. The sensitivity is 0.583 dB/° and 0.849 dB/°, respectively, in the range of 0° to 90°. Thanks to the FRL system, narrow 3-dB bandwidth (<0.1 nm) and high optical signal-to-noise ratio (~60 dB) are achieved. The tFBG in the FRL system can be used for working as a temperature insensitive inclinometer. The results suggested that the proposed inclinometer has the advantages of compact size and convenient manufacture, enhancing its potential for application prospect.

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A Study of the Lossy Mode Resonances during the Synthesis Process of Zinc Telluride Films

“…Currently, one of the most rapidly developing areas in this domain is dedicated to fiber-optic sensors (FOSs) [ 2 ]. Resistance to external electromagnetic fields, physical and chemical durability, the small transverse size and linear density of the optical fiber, and most importantly, the possibility of the remote monitoring of almost any parameter of the environment make such sensors indispensable devices in many areas of modern life [ 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. Quite often, as sensitive elements for FOS, an optical fiber with a coating on the lateral surface is used, which makes it possible to realize in them such phenomena as surface plasmon resonance (SPR) [ 10 , 11 , 12 , 13 , 14 ] and lossy mode resonance (LMR) [ 15 , 16 , 17 , 18 , 19 ].…”