High sensitivity diaphragm-based extrinsic Fabry-Pérot interferometric optical fiber underwater ultrasonic sensor

WANG Wenhua; Qingxu YU; Xinsheng JIANG

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High sensitivity diaphragm-based extrinsic Fabry-Pérot interferometric optical fiber underwater ultrasonic sensor

WANG Wenhua 1,Qingxu YU 2 *,Xinsheng JIANG 3

1.School of Physics and Optoelectronic Technology, Dalian University of Technology, LiaoNing DaLian 116024

2. School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024

3.Fujian Castech Crystals Inc., Fuzhou 350002

*Correspondence author

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Funding: University Doctor Special Research Foundation of the Ministry of Education（No.20100041110028）, National Natural Science Foundation of China（No.60977055）

Opened online:10 August 2012

Accepted by: none

Citation: WANG Wenhua ,Qingxu YU,Xinsheng JIANG.High sensitivity diaphragm-based extrinsic Fabry-Pérot interferometric optical fiber underwater ultrasonic sensor[OL]. [10 August 2012] http://en.paper.edu.cn/en_releasepaper/content/4485857

In this paper, a novel structure of the diaphragm-based extrinsic Fabry-Pérot interferometric (DEFPI) optical fiber ultrasonic sensor with a through vent hole of the fused silica ferrule was present. In this sensor system, the amplified spontaneous emission (ASE) optical source and the Fabry-Pérot filter are used to adjust the wavelength of the operation point of the sensor. We performed the ultrasonic distance detection experiment from 1 cm to 31 cm and the sensor sensitivity experiment, and the pressure sensitivity of the sensor is 9.68 nm/kPa (66.69 nm/psi). The sensitivity of the fusion silica structure DEFPI optical fiber is much higher than that of the HCPCF-ILFP (hollow-core photonic crystal fiber in-line fiber-optic Fabry-Pérot) and the fiber Bragg grating (FBG).

Keywords:Optical fiber sensors; Ultrasonic sensor; Extrinsic Fabry-Pérot interferometer; Diaphragm

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