Universiti Teknologi Malaysia Institutional Repository

Optical relative humidity sensor based on a hollow core-photonic bandgap fiber

Mohd. Noor, Muhammad Yusof and Khalili, N. and Skinner, I. and Peng, G. D. (2012) Optical relative humidity sensor based on a hollow core-photonic bandgap fiber. Measurement Science & Technology, 23 (8). pp. 1-7. ISSN 0957-0233

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Official URL: http://dx.doi.org/10.1088/0957-0233/23/8/085103

Abstract

We propose a novel relative humidity (RH) sensor based on a hollow core-photonic bandgap fiber (HC-PBF) using a wavelength scan and a reference technique in this paper. The wavelength scan of water vapor absorption peak around 1368.59nm is realized by injecting sawtooth modulated current to a DFB laser diode. The humidity level is determined by the voltage difference (?V) between the reference signal and absorption signal at the peak of water vapor absorption. The reference signal is used not only as a zero absorption baseline but also to reduce the influence of intensity noise from DFB laser source. We have experimentally implemented the wavelength scanning modulation scheme with a HC-PBF sensing head of 5cm and a small gap between SMF and HC-PBF to allow air diffusion into air holes of HC-PBF. High humidity sensitivity of 3.02mV/1% RH over the range from 0 to 90% RH is achieved without the use of any coating material for humidity sensing.

Item Type:Article
Uncontrolled Keywords:water vapor absorption band, wavelength scanning
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:32980
Deposited By: Fazli Masari
Deposited On:31 Jul 2013 05:37
Last Modified:30 Nov 2018 06:33

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