Fig. 1. FP cavity dual beam interference model

Fig. 2. Distribution of light field before and after collimation

Fig. 3. Schematic diagram of fiber optic cutting and sensor structure

Fig. 4. Layout setup of optical fiber sensor array for sound location

Fig. 5. Experimental system diagram

Fig. 6. Time domain and frequency domain diagram of sensor at 70 Hz and 500 Hz

Fig. 7. Comparison of interference fringes and slopes for EFPI with or without collimator

Fig. 8. Comparison diagram of sound pressure response， sound pressure sensitivity and frequency response of EFPI sensor with or without collimator at 500 Hz frequency

Fig. 9. Schematic diagram of sensor array

Fig. 10. Sound press response of the Sensor array at 1 kHz

Fig. 11. Schematic diagram and results of acoustic directivity experiment

Fig. 12. Time-domain waveforms and cross correlation results of the three sensors when the sound source coordinate is （50 cm， 70 cm）.

Fig. 13. Sensor array detection results