Add to BibSonomy
Abstract
In this work, a photoacoustic (PA) gas sensor with a micro-embedded acoustic resonator for gas leakage detection was demonstrated. The micro-embedded acoustic resonator was fabricated by putting a leaky hollow-core fiber (L-HCF) into a cylindrical buffer chamber. The L-HCF was utilized as the PA cavity and the light transmission media simultaneously. The optimal inner diameter of the L-HCF was 1.7 mm. The embedded acoustic resonator was experimentally proven to be equivalent to a T-type half-open acoustic resonator, but the structure became much more compact. The volume of the amount of gas in the cell was only ∼0.3 mL, and the gas diffusion time to fill the sensor under room temperature (25°C) and ambient pressure (101 kPa) was ∼44 s. Trace acetylene (C2H2) in pure nitrogen (N2) was chosen as the target gas, and the minimum detectable limit (MDL) reached 29 ppb when the lock-in integration time was 1 s. The normalized noise equivalent absorption (NNEA) coefficient was calculated to be 3.0 × 10−9 W·cm-1·Hz-1/2. The micro-resonant PA gas sensor, with merits of compactness, low gas consumption, and low cost, has the potential to be a remote gas sensing scheme in fields of environmental protection, industrial process monitoring, and so on.
© 2023 Optica Publishing Group
Full Article | PDF ArticleMore Like This
Bo Zhang and Yiwei Shi
Opt. Express 31(21) 34708-34720 (2023)
Fupeng Wang, Liyan Fu, Jianguo Zhang, Ze Han, Shuo Pang, Qingsheng Xue, Diansheng Cao, Qian Li, and Qiang Wang
Opt. Lett. 49(8) 2173-2176 (2024)
Guojie Wu, Xue Wu, Zhenfeng Gong, Jiawei Xing, Yeming Fan, Junsheng Ma, Wei Peng, Qingxu Yu, and Liang Mei
Opt. Express 31(21) 34213-34223 (2023)