Response Analysis of Distributed Feedback Fiber Laser Sensor in High-Frequency Ultrasonic Field

摘要

The response of the distributed feedback (DFB) fiber laser sensor under ultrasonic excitation is represented by the change in the reflection spectrum. In this paper, we simulate the strain of the axial distribution of DFB by finite element method and calculate the reflection spectrum by transfer matrix method. The results show that under the action of high-frequency ultrasonic, the wavelength shift of DFB is small, and it is not sensitive to high-frequency ultrasonic waves. The peak with lower reflectivity in the spectrum is distorted.