Fig. 1. Fiber-optic F-P cantilever sensor

Fig. 2. Interference spectrum of fiber-optic F-P cantilever sensor

Fig. 3. Absorption line and relationship between central wavelength of DFB laser and current

Fig. 4. Multi-pass resonant photoacoustic cell

Fig. 5. Fiber-optic photoacoustic sensing system

Fig. 6. Minimum sound pressure level measured at 1 kHz

Fig. 7. Relationship between photoacoustic response and modulation current

Fig. 8. Frequency response of photoacoustic cell

Fig. 9. Linearity analysis analysis of the system

Fig. 10. Performance analysis of the system