Fig. 1. Relationship of (a) quality factor and (b) cell constant with size of resonant cell

Fig. 2. Structural diagrams of (a) fiber-optic F-P microphone probe and (b) cantilever

Fig. 3. Frequecy response of fiber-optic F-P microphone

Fig. 4. Near-infrared absorption lines of acetylene and moisture

Fig. 5. Structural diagram of laser photoacoustic spectroscopic system

Fig. 6. Frequency response of resonant photoacoustic cell

Fig. 7. (a) Second harmonic signals and (b) photoacoustic responses under different volume fractions of acetylene

Fig. 8. Background noise measurement with photoacoustic cell filled with pure nitrogen