Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Side Polished Fiber Optic UV Sensor Using Evanescent Coupling of Photo-Functional Polymer

광기능성 폴리머의 소산장 결합을 이용한 측면연마 광섬유형 자외선 센서

  • 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)
  • Published : 2002.11.30
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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.

측면연마된 광섬유와 광기능성 색소가 분산된 평면도파로 결합기를 이용한 새로운 형태의 자외선 센서를 제작하여 그 특성을 측정하였다. 자외선 조사에 의해 유효굴절률이 변화하는 광변색성 색소가 분산된 폴리머를 평면 도파로 재료로 사용하였다. 박막 광도파로는 광변색성 색소인 스파이록사진을 사용하였다. 자외선 조사시간을 20초, 30초, 40초로 증가시켰을 경우 센서의 파장응답은 1.44nm/mW, 1.64nm/mW, 1.78nm/mW였고 1550nm 파장에서 센서의 90% 복귀시간은 100초로 나타났다.

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References

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