| Summary: | 碩士 === 大同大學 === 光電工程研究所 === 96 === The theory of fluorescence is broadly applied to the chemical detection and the biomedical engineering. In recent years, in Taiwan, many people use hydrogen peroxide (H2O2) as bleacher in the food treatment in order to make the appearance of the food better. However, it is harmful to health of the consumer that most over-the-counter peroxide solutions are ingested, so we develop a fiber-based fluorescence sensor to detect the concentration of hydrogen peroxide using the property of fluorescence.
In this study, we have to polish the side surface of an optical fiber (multi-mode) and utilized the evaporation Coater to coat a metal thin film(Al) on the fiber end faucet and then prepare to coat the fluorescent sol-gel on the polished surface. After the BPEA film is coated, a near-UV LED is applied to excite the BPEA film and an OSA is used to monitor the peak of fluorescence spectrum. Finally, we will carry out the experiments for the temperature measurement and different concentrations of H2O2 solutions detection.
In the results that the fluorescence intensity of the sensor in temperature measurement is a function of the temperature with the linear response region is about from 4℃ to 100℃ and the thermal hysteresisratio is about 2.77％. In the measurement of concentration of hydrogen peroxide, the fluorescence emission increases versus the concentration of hydrogen peroxide increases.
In the future work, we will reform the technology of BPEA so-gel or fabricate the second structure on the polished surface to improve the sensitivity of temperature sensor and the concentration of hydrogen peroxide sensor better.
|
|---|
