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http://dx.doi.org/10.5369/JSST.2002.11.6.335

Side Polished Fiber Optic UV Sensor Using Evanescent Coupling of Photo-Functional Polymer  

Kim, Sang-Woo (Dept. of Sensor Engineering, Kyungpook National University)
Seo, Gyoo-Won (Dept. of Sensor Engineering, Kyungpook National University)
Yoon, Jong-Kuk (Dept. of Sensor Engineering, Kyungpook National University)
Jang, Su-Won (Dept. of Electronic Engineering, Kyungpook National University)
Yu, Yun-Sik (School of Science and Technology, Dongeui University)
Lee, Seung-Ha (School of Electronic and Electrical Eng., Kyungpook National University)
Kang, Shin-Won (School of Electronic and Electrical Eng., Kyungpook National University)
Publication Information
Journal of Sensor Science and Technology / v.11, no.6, 2002 , pp. 335-341 More about this Journal
Abstract
In this paper, we investigated a novel UV sensor using evanescent field coupling between the side polished fiber and photo-functional polymer waveguide. It was found that resonant wavelength shifts occur due to variation in the refractive index of polymer planar waveguide for its photo-functional properties on exposed UV. Spiroxazine (photochromic dye) was used as the planar waveguide. The resonant wavelength responses were exhibited at 1.44 nm/mW, 1.64 nm/mW, and 1.78 nm/mW when UV irradiations were exposed for 20 seconds, 30 seconds, and 40 seconds, respectively. The recovery time of sensor was independent of UV exposure power and 90% recovery time was 100 seconds.
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