High-precision detection of acetylene using photoacoustic spectroscopy with a three-step cylindrical cell

Qiaoyun Wang*, Lei Li, Shunyuan Xu, Ziheng Zhu, Jilong Wang, Xin Zou, Qiang Liu, Jibing Cheng, Richard Fu

*Corresponding author for this work

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High-precision photoacoustic spectroscopy (PAS) with a three-step cylindrical photoacoustic cell (TSC-PAC) was developed for acetylene (C2H2) detection. Finite element analysis was used to investigate the acoustic properties of the proposed TSC-PAC and conventional H-type cylindrical photoacoustic cell (HTC-PAC). Simulation results showed that acoustic pressure signal of the TSC-PAC was higher than that of HTC-PAC with the same dimension. Resonance frequency of the TSC-PAC was identified at 984 Hz. In experimental studies, a plane mirror was used to reflect the incident light and increase the optical length in the PAC. A silicon-cantilever-based fiber-optic sensor was positioned at the terminal point of the TSC-PAC, where the maximum photoacoustic (PA) signal was located. With C2H2 concentration of 100 ppm, the 2f signal of TSC-PAC was 1.43 times that of HTC-PAC. When the integration time was 100 s, the linear fitting (R2) and minimum detection limit (MDL) of C2H2 measured by TSC-PAC at the atmospheric pressure were 0.996 and 13.74 ppb, respectively. The normalized noise equivalent absorption (NNEA) coefficient was 8.18×10-8cm-1·W·Hz-1/2. Both simulation and experimental results proved that the developed TSC-PAC enhanced the performance of the PAS and it had certain application potential in the PAS.
Original languageEnglish
Number of pages8
JournalIEEE Sensors Journal
Early online date15 May 2024
Publication statusE-pub ahead of print - 15 May 2024

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