基于光纤激光传感器的双频超声测量

Dual-frequency ultrasound measurements based on fiber laser sensor

提出一种基于分布布拉格反射式(DBR)光纤激光传感器用于液体环境中的双频超声测量系统。选用3MHz和7MHz的双频超声信号,通过改变调频指数,获得了四种不同情况下DBR光纤激光器的频谱输出,与理论分析相一致。结果证明,DBR光纤激光传感器可以用来检测双频超声信号。

A dual-frequency ultrasound （ DFUS） measurement system based on distributed Bragg reflector （DBR） fiber laser sensor in liquid medium is presented. It fixed the driving frequencies of two ultrasound signals at 3MHz and 7MHz, and obtained four types spectra of the DBR fiber laser corresponding to the modulation index. Good agreement between theoretical and experimental results was achieved. The results demonstrate that the DBR fiber laser sensor can be used for dual-frequency ultrasound measurements.