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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 the detection of dynamic strain by fiber Bragg grating, the basic principle of the demodulation scheme of matching fiber Bragg grating wavelength shift is analyzed. By using the advantages of high sensitivity of matched grating detection and the advantages of FBG sensor, this new method is combined with ultrasonic testing. It is innovatively used to study the relationship between the propagation speed of ultrasonic wave and the temperature in ice sample. Through fiber Bragg grating The relationship between the propagation velocity of longitudinal and transverse waves and temperature in ice samples was simulated and the data were fitted and calculated by Matlab. The law of acoustic parameters of ice samples with temperature was obtained. The lower the temperature, the higher the propagation speed of ultrasonic waves in ice samples . The measured data are compared with the data measured by the ultrasonic system. The results show that the data measured by fiber Bragg grating is correct and reliable, which proves that fiber Bragg grating can be used to detect the acoustic performance of ice.