Acta Optica Sinica, Volume. 33, Issue 9, 906001(2013)
Acoustic Detection Technology Based on Fiber Bragg Grating Fabry-Perot Interferometer in Liquid Medium
Combining with fiber Bragg grating Fabry-Perot interferometer (FBG-FPI) with cylinder oscillator coupling technology, a highly sensitive sensor is designed for detecting acoustic signal in liquid dielectrics of electrical equipment. A fiber Bragg gratting (FBG) with reflectivity of 50% is cut in the middle to produce two identical half-length Bragg gratings, and a piece of 20-mm SMF-28 monomode fiber is spliced between the FBGs to produce the FBG-FPI. The parameters of the cylinder oscillator are determined for high sensitivity by finite element analysis method based on the theory of elasticity. A novel method of temperature compensation using a tunable distributed feedback (DFB) laser is presented to solve FBG-FPI static working point drift influenced by temperature change. The effect of temperature compensation is proved by raising and falling temperature experiment. A contrast system with FBG-FPI sensor and RC6500T transducer is designed and constructed. The experimental results show that FBG-FPI in liquid dielectrics has the same sensitivity as acceleration transducer for the 1.1 kHz acoustic signal.
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Zhang Weichao, Zhao Hong, Liu Tong, Wang Guoli, Li Ruihai. Acoustic Detection Technology Based on Fiber Bragg Grating Fabry-Perot Interferometer in Liquid Medium[J]. Acta Optica Sinica, 2013, 33(9): 906001
Category: Fiber Optics and Optical Communications
Received: Feb. 23, 2013
Accepted: --
Published Online: Aug. 27, 2013
The Author Email: Weichao Zhang (weichaozhang@163.com)