摘要
以光纤布拉格光栅检测动态应变为基础,分析了匹配型光纤布拉格光栅波长移动解调方案的基本原理。利用匹配光栅法检测的高灵敏性及光纤光栅传感器本身的优点,将其与超声波检测相结合,创新性地用于研究超声波在冰样中的传播速度随温度的变化关系,通过光纤布拉格光栅检测冰样中纵波、横波传播速度与温度的关系,利用Matlab对数据进行拟合及计算,得到了冰样的声学参数随温度变化的规律:温度越低,超声波在冰样中的传播速度越高。并将所测数据与超声波系统所测数据进行对比,结果表明,光纤布拉格光栅所测数据正确可靠,证明了光纤布拉格光栅可用于检测冰的声学性能。
Based on dynamic strain detection with fiber Bragg gratings, the basic principles of wavelength shift demodulation using matching fiber Bragg gratings are analyzed. The high sensitivity of matching grating demodulation and the advantage of fiber Bragg gratings, which are combined with ultrasonic testing, are innovatively used for studying dependence of the propagation of ultrasonic waves on temperature in the ice. By using the fiber Bragg grating, the relationship between the velocity velocities of the longitudinal wave and shear wave, and temperature of the ice samples are detected. Using Matlab for data processing, the relationship of acoustic parameters with temperature in the ice is obtained, which shows that both the longitudinal wave and the shear wave have an increasing trend with the decrease of temperature. The measured data are also compared with ones measured by ultrasonic system, which demonstrates the accuracy and reliability of the data obtained with the fiber Bragg gratings. Therefore, the present technique can be used to conveniently and proficiently study the acoustic properties of ice.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2015年第11期61-70,共10页
Acta Optica Sinica
基金
国家自然科学基金(41376185)
国家科技支撑计划项目(2012BAK04B03)
公益性行业科研专项经费项目(201311041)
海洋公益性行业科研专项经费项目(201405026-01)
关键词
光纤光学
光纤布拉格光栅
声学性能
超声波检测
冰
fiber optics
fiber Bragg grating
acoustic performance
ultrasonic testing
ice
