Open AccessIntegration of T-type half-open photoacoustic cell and fiber-optic acoustic sensor for trace gas detection
Author(s) -
Zhenfeng Gong,
Ke Chen,
Yewei Chen,
Liang Mei,
Qingxu Yu
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.018222
Subject(s) - photoacoustic spectroscopy , materials science , detection limit , optics , trace gas , resonator , optical fiber , fiber optic sensor , signal (programming language) , analytical chemistry (journal) , photoacoustic imaging in biomedicine , optoelectronics , physics , chemistry , chromatography , computer science , programming language , meteorology
We present a novel T-type half-open resonant photoacoustic (PA) cell for trace gas detection. The T-type PA cell has just one buffer volume, and a fiber-optic acoustic sensor is placed at one end of the resonator. Compared with the conventional H-type PA cell, the first-order resonant frequency of the T-type PA cell is reduced by half and the PA signal is enhanced with the same resonator. The T-type resonant PA cell was used in acetylene (C 2 H 2 ) gas detection system based on PA spectroscopy. Experimental results show that the minimum detectable limit of C 2 H 2 is calculated to be 0.70 parts per billion (ppb), which is lower than the traditional H-type PA cell.