基于光频域反射仪的光纤水听器探头结构形变研究  

Structural Deformation of Fiber Optic Hydrophone Probe Based on Optical Frequency Domain Reflectometry

作　　者：王宇 肖迪 牛洋洋 杨洁 杨鹏希 朱兆昊 尹国路 朱涛[1,2] Wang Yu;Xiao Di;Niu Yangyang;Yang Jie;Yang Pengxi;Zhu Zhaohao;Yin Guolu;Zhu Tao(Key Laboratory of Optoelectronic Technology&Systems,Ministry of Education,Chongqing University,Chongqing 400044,China;State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China;Hunan Great Wall Hidden Optical Fiber Technology Company,LTD.,Changsha 410000,Hunan,China)

机构地区：[1]重庆大学光电技术及系统教育部重点实验室,重庆400044 [2]重庆大学煤矿灾害动力学与控制国家重点实验室,重庆400044 [3]湖南长城海盾光纤科技有限公司,湖南长沙410000

出　　处：《光学学报》2023年第5期235-243,共9页Acta Optica Sinica

基　　金：国家自然科学基金(61975022);国家杰出青年科学基金(61825501);重庆市自然科学基金创新研究群体科学基金(cstc2020jcyj-cxttX0005);重庆英才·青年拔尖人才项目(CQYC202005011)。

摘　　要：光纤水听器探头在深海静水压力下存在变形,这会影响其对水下声信号的探测性能,甚至会使探头失稳而无法在深海环境中继续作业。传统电学传感器因受限于尺寸和电磁干扰等因素,故难以被用于水听器探头的形变监测中。光纤光栅点式传感器的空间分辨率较低,故也无法对尺寸小的光纤水听器探头进行全分布式力学监测。为此,提出了一种基于光频域反射仪的高空间分辨率、高精度的光纤水听器探头形变监测方法。在实验中,光纤紧密缠绕在水听器探头的表面,采用自主研制的分布式光纤形状监测分析仪测量了探头形变产生的光纤瑞利散射光谱的波长漂移,并采用逆向积分的方法实现了探头形状的二维重构。研究结果表明:随着静水压力的增大,水听器探头直径逐渐缩小,并沿周向出现周期性凹陷;当静压力达到6 MPa时,三个周期性凹陷深度达到124μm。该实验研究结果与基于ANASYS的耐压性仿真结果相符。Objective Fiber optic hydrophones are a kind of underwater acoustic information sensor built on optical fiber and optoelectronic technology platform.They mainly use optical coherence detection technology to convert an underwater acoustic signal into an optical signal and transmit it to the signal processing system through optical fiber so that useful sound data can be obtained.They have the advantages of high sensitivity,wide dynamic range,resistance to electromagnetic dry radiation,flexible structure,being ready to form large-scale arrays,and being suitable for extremely harsh conditions.Thus,since their advent,they have developed rapidly under the impetus of huge military strategy and civilian value and become an important development direction of modern optical sensing technology and underwater acoustic sensing technology.In recent years,with the increase in the frequency of maritime shipping and seabed mining activities,there are higher requirements for the detection ability of underwater targets,and the research focus of fiber optic hydrophones has gradually moved closer to the array multiplexing technology.However,as one of the key technologies of the underwater acoustic detection system,the hydrophone unit technology cannot be ignored,and the probe technology is particularly important.Fiber optic hydrophone probes will be deformed by the hydrostatic pressure in a deep-sea environment,which affects the detection performance of underwater acoustic signals and even makes the probe unstable and cannot continue to operate in the deep-sea environment.For the sake of ensuring that the hydrophones can work stably and effectively,a high-precision shape measurement method is urgently needed to provide an accurate and reliable approach to detecting the structural deformation of the fiber optic hydrophone probe.Traditional electrical sensors are difficult to be used for the deformation monitoring of hydrophone probes due to factors such as size and electromagnetic interference.Fiber Bragg grating cannot perform the fu

关 键 词：传感器 分布式光纤传感 光频域反射仪 光纤水听器 形状传感 

分 类 号：TN29[电子电信—物理电子学]