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URN etd-0827107-222919 Statistics This thesis had been viewed 4116 times. Download 2534 times. Author Ming-Che Hung Author's Email Address No Public. Department Electro-Optical Engineering Year 2006 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 78 Title A SOL-GEL BASED FIBER OPTIC SENSOR FOR pH MEASUREMENT Keyword pH fiber sensor sol-gel sol-gel fiber sensor pH Abstract In this thesis, we have fabricated a novel side-polished fiber sensor for pH measurement. To utilize the structure to measure the variation of the pH in the acid or base solution, we measure the signal by the particular wavelength was absorbed to change the spectrum within the side-polished or the grating region. To increase the sensitivity of the sensor, we polish the surface of the fiber into the core region which have a good Evanescent-wave response ,and then a long period grating surface was also made on the side-polished surface by virtue of ICP RIE technique. The comparison of both side-polished and long period grating fiber sensors have been carried out. Beside, we introduced a sol-gel method to synthesize the sensing film (including three indicators such as cresol red, bromophenol blue and chlorophenol red) on the polished surface of the fiber pH concentration measurement. The light sources (halogen light, 690nm laser, 1537.86nm laser) were used to define the light into the fiber sensor to sensing the range of pH concentration. It identification the pH value change from 2.4 to 11.2 can be measured by the sensor we proposed. Moreover, small size and easy fabrication are the advantages of the sensors. The experimental results haveing very good pH response from strong acid to strong base. Advisor Committee Woo-Hu Tsai - advisor
Wen-Ching Shih - co-chair
Yu-Cheng Lin - co-chair
Files Date of Defense 2007-07-25 Date of Submission 2007-08-30