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염세혁 ( Se Yuk Yeom ),임준우 ( Jun Woo Lim ),김학린 ( Hak Rin Kim ),강신원 ( Shin Won Kang ),( Yuan Heng ) 한국센서학회 2010 센서학회지 Vol.19 No.6
In this study, a novel gas sensor based on evanescent field coupling between single mode side polished fiber and solvatochromic dye dispersed polymer waveguide was demonstrated. We fabricated a side polished optical fiber device as a volatile organic compounds gas detector. Solvatochromic dye was coated on the top of the side polished optical fiber to take advantage of evanescent field coupling. The solvatochromism can be defined as the phenomenon whereby a compound changes color, either by a change in the absorption or emission spectra of molecule, when reacted in different VOCs. The device reacted to polarity gases like a hexane, butane, xylene etc. The resonance wavelength was shifted by the xylene concentration which range was 0.1 ppm -100 ppm. Also, the response with the concentration was lineer and the detection limit was 0.1 ppb.