Absorbance properties of gold coated fiber Bragg grating sensor for aqueous ethanol
Arasu, P. T. and Muhammad Noor, Ahmad Shukri and Shabaneh, Arafat A. and Girei, Saad Hayatu and Mahdi, Mohd Adzir and Lim, Hong Ngee and Abdul Rashid, Hairul Azhar and Yaacob, Mohd. Hanif (2014) Absorbance properties of gold coated fiber Bragg grating sensor for aqueous ethanol. Journal of the European Optical Society: Rapid Publications, 9 . art. no. 14018. pp. 1-5. ISSN 1990-2573
Official URL: http://www.jeos.org/index.php/jeos_rp/article/view...
Optical Fiber Bragg Grating (FBG) is commonly deployed as a wavelength selective filter in telecommunication as well as to detect physical changes such as pressure, temperature and strain in sensing applications. This paper presents an investigation of FBG as a chemical sensor towards ethanol in aqueous solution. Telecommunication standard single mode FBGs were coated with different thicknesses of thin gold films via sputtering deposition method. The combination of Bragg gratings and gold film enhances the evanescent wave on the surface of the optical fiber. It was found that the FBG coated with 50 nm gold layer exhibits the strongest response towards water with varying concentrations of ethanol. The sensor shows 55% change in absorbance levels when the concentration of ethanol is increased from 0 to 99.7% in water.
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