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Evanescent Field Absorption Sensor Based On Special U Shaped Optical Fiber

Chun Lan Liu, En Ming Zhao, En Tao Li, Ai Zhou, Xing Hua Yang

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In this article, an evanescent field absorption sensor based on special U shaped optical fiber is proposed. This optical fiber has a hollow structure and an inner core in the cave. The methylene blue is absorbed into the optical fiber and the absorbance is tested. Results show that the value of the absorption will reflect the concentration of the concentration of methylene blue in optical fiber.