Optical fibre sensor using frequency beating technique

Resen, Deyhaa A. and Hmood, Jassim K. and Harun, Sulaiman Wadi (2020) Optical fibre sensor using frequency beating technique. International Journal of Nanoelectronics and Materials, 13 (2). pp. 241-248. ISSN 1985-5761,

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Official URL: https://ijneam.unimap.edu.my/images/PDF/IJNEAM%20A...


In this paper, a new method to realize the optical fibre sensor using an optical heterodyne technique (OHT) is proposed and numerically demonstrated. In this method, the bandpass filter (BPF) was utilized as a reference element and fibre Bragg grating (FBG) served as a sensing element. The wideband light is equally split and launched to sensing and reference elements. The reflected light of sensing element coherently interferes with the output of BPF inside 3-dB coupler. A photodiode detects the interfered signal and the beat frequency can be determined to achieve a high-resolution. To examine the proposed method, the scheme for temperature sensing is investigated. The Fabry-Perot narrow-bandpass filter type (F7 glass) serve as BPF. The results reveal that a good and fast response to temperature change with the sensitivity of 1.152 GHz/oC can be obtained. © 2020, Universiti Malaysia Perlis. All rights reserved.

Item Type: Article
Uncontrolled Keywords: Bragg Grating Fibre; Fabry-Perot Narrow-Bandpass Filter; Interferometric Sensors; Optical Heterodyne Technique
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 05 Aug 2020 07:37
Last Modified: 05 Aug 2020 07:37
URI: http://eprints.um.edu.my/id/eprint/25267

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