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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