Abstract
Abstract ： This paper reports a preliminary experimental investigation and characterization of an optical fiber-based submersion sensor sy stem for applications in water flooding and leakage. The sensor system comprises a multi-mode fiber spliced with fiber Bragg grating and an intensity-based interrogator. S ubmersion tests were conducted in water-air and Glycerin-air environments. By the re fractive index of the fiber-probe surrounding materials, the reflectance and the dete cting power level is determined. When the probe is dipped into the water, the optica l output power dramatically decreases from -7.5dBm to -17.5dBm. But, the cente r of Bragg wavelength is not affected in spite of external material changes. Temporal response characteristics of the sensor system is investigated to verify the real-time reaction. When the probe is immersed into the liquid, there is no transition time. Key words ：Fiber optic sensors (광섬유 센서), Submersion sensors ( 침수센서), Reflectance (반사도), Multi-mode fiber (다중모드 광섬유), Fiber Bragg grating (광섬유 브래그 격자)
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