Optical fiber humidity sensor based on a tapered fiber with hydroxyethylcellulose/polyvinylidenefluoride composite

Lokman, A. and Nodehi, S. and Batumalay, Malathy and Arof, Hamzah and Ahmad, Harith and Harun, Sulaiman Wadi (2014) Optical fiber humidity sensor based on a tapered fiber with hydroxyethylcellulose/polyvinylidenefluoride composite. Microwave and Optical Technology Letters, 56 (2). pp. 380-382. ISSN 0895-2477

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/mop.280...

Abstract

A simple relative humidity (RH) sensor is demonstrated using a tapered fiber with an hydrogel coating. Hydroxyethylcellulose/polyvinylidenefluoride polymers are used to form the hydrogel coating of the tapered fiber as they are sensitive to moisture and thus the humidity of the atmosphere. Changes in humidity level alter the refractive index of the fiber coating and this condition leads to variation in optical output power. A difference of up to 0.89 dB of the transmitted optical power is observed when RH changes from 50 to 80%. The proposed sensor has a sensitivity of about 0.0228 dB/%RH with a slope linearity of more than 99.91%. In summary, the hydrogel coating acts as an inner cladding whose refractive index decreases with the rise in humidity and thus allows more light to be transmitted in humid state.

Item Type: Article
Uncontrolled Keywords: Fiber optic sensor; Tapered optical fiber; Humidity sensor; Relative humidity; Hydroxyethylcellulose/polyvinylidenefluoride
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 26 Oct 2015 09:00
Last Modified: 09 Oct 2018 05:26
URI: http://eprints.um.edu.my/id/eprint/14340

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