A new design method for miniature dual-resonance photoacoustic structure based on piezoelectric ceramics slice

A mini-resonant photoacoustic sensor based on a sphere-cylinder coupled acoustic resonator for high-sensitivity trace gas sensing

“… PAC operating mode Laser wavelength (nm) Cavity volume (cm 3 ) Detection limit @ IT (ppb) NNEA (W∙cm −1 ∙Hz 1/2 ) Ref. Non-resonate Non-resonate 1650.96 1650.96 1.1 × 10 −3 4.19 51100 @ 1 s 1230 @ 1 s 4.57 × 10 −7 not stated [13] [25] Resonate 1653.7 267.8 1800 @ 183 s 2.7 × 10 −9 [40] Resonate 1645.61 3.75 15750 @ 10 s not stated [47] Resonate 1650.96 222 200 @ 400 s 2.9 × 10 −9 [54] Resonate 1650.96 186.83 430 @ 1 s 9.75 × 10 −9 [55] Resonate 3311 9.1 14930 @ 1 s 2.2 × 10 −7 [56] Resonate 1650.96 0.8 1000 @ 1 s 10.4 × 10 −9 [ This paper ] …”

“…In 2023, Zhou et al . reported a miniature dual-resonance PAS sensor based on a piezoelectric ceramics slice and a miniature TR-PAC [47] . The volume of the entire sensor was reduced by optimizing the size of the TR-PAC’s resonator and buffer chamber.…”

A dual‐resonance enhanced photoacoustic spectroscopy gas sensor based on a fiber optic cantilever beam microphone and a spherical photoacoustic cell

“…The first‐order resonance frequency (FORF) of the T‐type PAC was matched with that of the piezoelectric ceramic wafer, realizing the dual‐resonance amplification of the photoacoustic signal. The LOD of the sensor for CH 4 was 542 ppb when the integration time was 217 s 36 . However, the above proposed PAC has a low Q value, making it difficult to achieve higher amplification of the photoacoustic signal.…”