Abstract

A miniature airborne sound detector based on distributed feed-back (DFB) fiber laser is designed and tested. The DFB fiber laser is packaged in a hollow cylinder cell and fixed to a thin film at one end. Its lasing wavelength will change along with the vibrating polyimide film in sound field. The modeling of detector is based on finite element method, and the simulation results illustrate the influence of the parameters of the thin film on the frequency response and the sensitivity. Experiments have been completed by demodulating the relative phase change signal converted from unbalanced Michelson interferometer, which come to a conclusion of the high sensitivity of 0.012 pm/Pa.

© 2018 The Author(s)