Dual-Path Excitation Multiquartz-Enhanced Photoacoustic Spectroscopy
A dual-path excitation multiquartz-enhanced photoacoustic spectroscopy (DE-M-QEPAS) sensor was reported for trace gas detection. The system employs a custom multipass cell (MPC) with a pentagonal star-shaped spot pattern, creating dual acoustic sources on both the inner and outer sides of each quartz tuning fork (QTF) prong. This dual-path excitation yielded a 1.31-fold signal enhancement. By further superimposing the outputs from the five QTFs, a combined signal enhancement factor of 3.8 was achieved. A minimum detection limit of 1.33 ppm was obtained for H<sub>2</sub>O detection at normal atmospheric pressure with a calculated normalized noise equivalent absorption coefficient of 1.23 × 10<sup>-8</sup> cm<sup>-1</sup>W/√Hz.
Authors
- Zhijin Shang
- Chuanliang Li (ORCID: https://orcid.org/0000-0003-4831-7130)
- Chenhua Liu (ORCID: https://orcid.org/0000-0002-0336-9407)
- Shuai Shi (ORCID: https://orcid.org/0009-0003-6563-4047)
- Yi Fan (ORCID: https://orcid.org/0009-0003-0743-408X)
- Xuanbing Qiu (ORCID: https://orcid.org/0000-0002-4271-4648)
- Zizhen Yang
- Yufei Ma
Institutions
- Harbin Institute of Technology (CN)
- Taiyuan University of Science and Technology (CN)
Publication Details
- Journal
- Analytical Chemistry
- Published
- 2026-02-27
- DOI
- https://doi.org/10.1021/acs.analchem.5c07833
- Primary Topic
- Spectroscopy and Laser Applications
- Type
- article
- Field-Weighted Citation Impact
- 0.00