Fig. 1. Schematic of the proposed FBGM.

Fig. 2. (a) Acoustic model of the FBGM and (b) electric-circuit element analogous to the acoustic model, where l and a are the length and the internal radius of the capillary glass tube, respectively, and V is the volume of the cavity.

Fig. 3. Response characteristic curve of the microphone.

Fig. 4. Simulated response of the microphone.

Fig. 5. Simulated responses of the microphones with capillary glass tubes of different internal radii.

Fig. 6. Photograph of a microphone prototype.

Fig. 7. Schematic for the experimental layout.

Fig. 8. Tested response of the fiber microphone.

Fig. 9. (a) Wavelength shift versus static pressure and (b) wavelength shift versus dynamic pressure amplitude of 1000 Hz.

Fig. 10. Tested temperature sensitivity of the fiber microphone.

Fig. 11. Tested directional characteristics of the fiber microphone.