Performance of dual-frequency ultrasound measurement based on DBR fiber laser hydrophone

摘要

Highlights?We report a detailed investigation of potential of DBR fiber lasers as a sensor designed for dual-frequency ultrasound measurement.?We analyze in detail theories which demonstrate the ability of DBR laser to measure DFUS considering the effects of ultrasound far and near field.?We conduct a series of experiments compared with the theory to support the results.?Agreement between theoretical and experimental results was obtained for ultrasound wave propagating from different distances and different DFUS driving voltage.AbstractThe ability of distributed Bragg reflector (DBR) fiber laser sensor in dual-frequency ultrasound (DFUS) measurement has been demonstrated. The influences of DFUS pressure on fiber grating laser sensor were theoretically analyzed, considering the effects of relative distance of the ultrasound field and the amplitude of the DFUS on the degrees of birefringence modulation