Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Development of Reflection-type Fiber-optic pH Sensor Using Sol-gel Film

졸-겔 필름을 이용한 반사형 광섬유 pH 센서의 개발

  • Yoo, Wook-Jae (School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University) ;
  • Seo, Jeong-Ki (School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University) ;
  • Jang, Kyoung-Won (School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University) ;
  • Moon, Jin-Soo (School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University) ;
  • Han, Ki-Tek (School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University) ;
  • Park, Jang-Yeon (School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University) ;
  • Lee, Bong-Soo (School of Biomedical Engineering, College of Biomedical & Health Science, Research Institute of Biomedical Engineering, Konkuk University) ;
  • Cho, Seung-Hyun (Department of Organic Materials & Fiber Engineering, College of Engineering, Soongsil University) ;
  • Heo, Ji-Yeon (Diagnostic Medical Devices Division, Medical Device safety Bureau, Korea Food & Drug Administration) ;
  • Park, Byung-Gi (Department of Energy & Environment Engineering, College of Engineering, Soonchunhyang University)
  • 유욱재 (건국대학교 의료생명대학 의학공학부, 의공학실용기술연구소) ;
  • 서정기 (건국대학교 의료생명대학 의학공학부, 의공학실용기술연구소) ;
  • 장경원 (건국대학교 의료생명대학 의학공학부, 의공학실용기술연구소) ;
  • 문진수 (건국대학교 의료생명대학 의학공학부, 의공학실용기술연구소) ;
  • 한기택 (건국대학교 의료생명대학 의학공학부, 의공학실용기술연구소) ;
  • 박장연 (건국대학교 의료생명대학 의학공학부, 의공학실용기술연구소) ;
  • 이봉수 (건국대학교 의료생명대학 의학공학부, 의공학실용기술연구소) ;
  • 조승현 (숭실대학교 공과대학 유기신소재.파이버공학과) ;
  • 허지연 (식품의약품안전청, 의료기기안전국, 의료기기 심사부 진단기기과) ;
  • 박병기 (순천향대학교 공과대학 에너지환경공학과)
  • Received : 2011.06.16
  • Accepted : 2011.07.20
  • Published : 2011.07.31
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Abstract

A reflection-type fiber-optic pH sensor, which is composed of a pH sol-gel film, plastic optical fibers, a mirror, a light source and a spectrometer, is developed in this study. As pH indicators, a bromthymol blue, a cresol red and a thymol blue are used, and they are immobilized in the sol-gel films. The emitted light from a light source is guided by a fiber-optic Y-coupler and plastic optical fibers to the pH sol-gel film in a pH sensing probe. The pH change in the sensing probe gives rise to a change in the color of the pH sol-gel film, and the optical characteristic of reflected light through the pH sol-gel film is also changed. Therefore, we have measured the spectra of reflected lights, which are changed according to the color variations of the pH sol-gel films with different pH values, by using of a spectrometer. Also, the relationships between the pH values and the intensities of reflected lights are obtained on the basis of the color variations of the pH sol-gel films.

Keywords

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