Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/1930
Title: Use of polyethylene glycol coatings for optical fibre humidity sensing
Authors: Açıkgöz, Sabriye
Bilen, Bukem
Demir, Mustafa Muammer
Menceloğlu, Yusuf Z.
Skarlatos, Yani
Aktaş, Gülen
İnci, Mehmet N.
Keywords: Humidity
Optics
Plastic fibre
Polyethylene glycol
Sensors
Publisher: Springer Verlag
Source: Açıkgöz, S., Bilen, B., Demir, M. M., Menceloğlu, Y. Z., Skarlatos, Y., Aktaş, G., and İnci M. N. (2008). Use of polyethylene glycol coatings for optical fibre humidity sensing. Optical Review. 15(2), 84-90. doi:10.1007/s10043-008-0012-1
Abstract: Humidity induced change in the refractive index and thickness of the polyethylene glycol (PEG) coatings are in situ investigated for a range from 10 to 95%, using an optical waveguide spectroscopic technique. It is experimentally demonstrated that, upon humidity change, the optical and swelling characteristics of the PEG coatings can be employed to build a plastic fibre optic humidity sensor. The sensing mechanism is based on the humidity induced change in the refractive index of the PEG film, which is directly coated onto a polished segment of a plastic optical fibre with dip-coating method. It is observed that PEG, which is a highly hydrophilic material, shows no monotonic linear response to humidity but gives different characteristics for various ranges of humidity levels both in index of refraction and in thickness. It undergoes a physical phase change from a semi-crystalline structure to a gel one at around 80% relative humidity. At this phase change point, a drastic decrease occurs in the index of refraction as well as a drastic increase in the swelling of the PEG film. In addition, PEG coatings are hydrogenated in a vacuum chamber. It is observed that the hydrogen has a preventing effect on the humidity induced phase change in PEG coatings. Finally, the possibility of using PEG coatings in construction of a real plastic fibre optic humidity sensor is discussed.
URI: https://doi.org/10.1007/s10043-008-0012-1
http://hdl.handle.net/11147/1930
ISSN: 1340-6000
1340-6000
1349-9432
Appears in Collections:Materials Science and Engineering / Malzeme Bilimi ve Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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