T-type cell mediated photoacoustic spectroscopy for simultaneous detection of multi-component gases based on triple resonance modality

Compact gas cell for simultaneous detection of atmospheric aerosol optical properties based on photoacoustic spectroscopy and integrating sphere scattering enhancement

“…Under identical simulation conditions, the acoustic pressure amplitude of the DTPAC surpasses that of both the sphere-tube coupled photoacoustic cell (2 ×10 −6 Pa) [40] and the H-type differential photoacoustic cell (3 ×10 −5 Pa) designed in our previous work [41] . In comparison with recently reported innovative photoacoustic cells, such as the differential integrating sphere photoacoustic cell (1.1 ×10 −6 Pa) [25] and the novel T-type photoacoustic cell (1.2 ∼ 6 ×10 −5 Pa) [23] , the DTPAC maintains a competitive edge in terms of acoustic pressure amplitude.…”

“…The photoacoustic cell, serving as the core of the photoacoustic detection system, significantly influences the performance of photoacoustic detection. In recent years, researchers have designed innovative high-performance photoacoustic cells [20] , [21] , [22] , [23] , [24] , [25] , [26] , including the Helmholtz photoacoustic cell, differential H-type photoacoustic cell, T-type photoacoustic cell, differential multi-pass photoacoustic cell, and integrating sphere photoacoustic cell. These advancements have notably enhanced the capability of photoacoustic spectroscopy for the detection of trace gases.…”

Photoacoustic Spectroscopy Gas Detection Technology Research Progress

“…This is very meaningful research, and it is the first time that a single photoacoustic cell has been truly used to simultaneously detect multiple gases (Figure 19). 88 The spherical photoacoustic cell is similar in structure to the T-type photoacoustic cell by turning the absorption cavity of the T-type photoacoustic cell into a sphere. The advantage of the spherical photoacoustic cell is that there is no viscous loss in the spherical absorption cavity and multiple reflections can be easily achieved inside, [89][90][91] but this photoacoustic cell has high fabrication requirements and requires a sufficiently smooth interior of the absorption cavity.…”

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

“…Trace gas sensing is of great significance in the areas of medical diagnosis [1] , [2] , combustion diagnostic [3] , environmental monitoring [4] , [5] , fire alarm [6] , etc. Laser-based photoacoustic spectroscopy (PAS) has been successfully implemented for ultra-sensitive trace gas sensing in recent years [7] , [8] , [9] , [10] , [11] , [12] , [13] , [14] , [15] , [16] , [17] , [18] , [19] , [20] , [21] . The photoacoustic effect is that the modulated light source is absorbed resulting in periodic heating of the gas in a photoacoustic cell (PAC), generating acoustic waves that can be detected by a microphone [22] , [23] , [24] , [25] .…”