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Optical Fiber Sensor Based on Air-Gap Long-Period Fiber Gratings

Ming-Yue Fu, Guei-Ru Lin1, Wen-Fung Liu2, Hao-Jan Sheng2, Po-Chun Su2, and Chuen-Lin Tien2

Department of Avionics Engineering, Air Force Academy, Kangshan, Kaohsiung 820, Taiwan, R.O.C.
1Ph. D. Program in Electrical and Communications Engineering, Feng-Chia University, Taichung 407, Taiwan, R.O.C.
2Department of Electrical Engineering of Feng-Chia University, Taichung 407, Taiwan, R.O.C.

(Received August 6, 2009; accepted September 17, 2009; published online December 7, 2009)

In this work, we propose a novel fiber sensor that is based on an air-gap long-period fiber grating (AG-LPG), which is fabricated by combining fiber side polishing with fiber lithography. Its sensing mechanism is based on the loss-peak wavelength shift of the AG-LPG as the refractive index around the sensing head varies. Experimental results show that the maximum sensitivity is 620 nm/unit index (1.1 nm/%) in the sensing of various sugar solution concentrations. This novel sensing head provides a simple, reliable, repeatable, accurate, and nondestructive approach for detecting various chemical solutions and mixing gases and for biomedical applications.

DOI: 10.1143/JJAP.48.120211

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