基于π相移光纤布拉格光栅的超灵敏超声传感器研究
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摘要：
针对高温、高压和核辐射等极端环境下金属构件的在线服役状态检测难题,提出了一种基于π相移光纤布拉格光栅(πPS-FBG)的超灵敏超声传感器.该传感器使用处于低成本通信波段(1550 nm)的单模分布式反馈(DFB)激光器为光源,以πPS-FBG为超声应变敏感器件,采用平衡差分探测方法显著抑制了激光光源噪声、探测器噪声和电子噪声等,提高了探测的信噪比.以线性压电陶瓷管为激励源,采用传统应变片为参考,对比测量了传统FBG和πPS-FBG的中心波长与应变的关系.通过静态实验得到πPS-FBG的电压响应灵敏度为190.907×109 V/m,为传统FBG的5倍.动态响应特性实验表明,传感器在1~5 MHz范围内的频率响应灵敏度变化小于19 dB,灵敏度为79.583×10-12ε.这为基于πPS-FBG传感器的金属构件服役状态检测提供了实验依据,有助于极端环境下激光超声无损检测技术的进一步发展和应用.
Aiming at addressing the problem that the structural health monitoring of metal components in extreme environments such as high temperature,high pressure,and nuclear radiation,an ultra-sensitive laser ultrasonic sensor based onπphase-shifted fiber Bragg grating(πPS-FBG)is proposed.The sensor used a single-mode distributed feedback(DFB)laser in the low-cost communication band(1550 nm)as the light source,improving the signal-to-noise ratio of detection by using aπPS-FBG as ultrasonic strain sensitive device,and combined with balanced differential detection method which significantly suppresses the laser light source noise,detector noise or electronic noise.Taking linear piezoelectric ceramic tube as excitation source and traditional strain gauge as reference,the relationship between central wavelength and strain was compared and measured.Through static experiments,the voltage response sensitivity ofπPS-FBG is 190.907 mV/pm,which was five times that of traditional FBG.The dynamic response characteristic experiment shows that the frequency response sensitivity of the sensor in the range of 1-5 MHz was less than 19 dB,and the sensitivity was 79.583 pε.These research results would provide an experimental basis for the structural health monitoring of metal components based onπPS-FBG,and contribute to the further development and application of nondestructive testing technology base on laser ultrasonic in extreme environment.
作者：
郭古青 尹梦科 于隽雅 邱选兵 李传亮
Guo Guqing;Yin Mengke;Yu Junya;Qiu Xuanbing;Li Chuanliang(Shanxi Engineering Research Center of Precision Measurement and Online Detection Equipment,School of Applied Science,Taiyuan University of Science and Technology,Taiyuan 030024,China)
机构地区：
太原科技大学山西省精密测量与在线检测装备工程研究中心
出处：
《betway官方app 学报：自然科学版》 CAS 北大核心 2022年第2期29-35,共7页
Journal of Henan Normal University(Natural Science Edition)
基金：
国家自然科学基金(52076145,U1810129,11904252) 山西省重点研发计划(201803D121090,201803D31077) 山西科技厅青年科技研究基金(201801D221017) 山西省高等学校优秀青年学术带头人(2018) 山西省高等学校科技创新项目(2019L0612) 应用光学国家重点实验室开放基金(SKLAO--201902) “1331工程”研究生教育创新计划经费(2019SY500) 太原科技大学博士启动金(20162039).
关键词：
超声传感器 πPS-FBG 传感器特性 激光解调法
ultrasonic sensor πPS-FBG sensor characteristics laser demodulation
分类号：
O439 [机械工程—光学工程]
