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http://dx.doi.org/10.5369/JSST.2011.20.4.266

Development of Reflection-type Fiber-optic pH Sensor Using Sol-gel Film  

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)
Publication Information
Journal of Sensor Science and Technology / v.20, no.4, 2011 , pp. 266-271 More about this Journal
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
Fiber-Optic Sensor; Optical Fiber; pH Sensor; pH Indicator; Sol-Gel;
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Times Cited By KSCI : 3  (Citation Analysis)
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