Dual-Path Excitation Multiquartz-Enhanced Photoacoustic Spectroscopy
Abstract
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 2 O detection at normal atmospheric pressure with a calculated normalized noise equivalent absorption coefficient of 1.23 × 10 –8 cm –1 W/√Hz.
Fields of Study & Subjects
Spectroscopy and Laser Applications
Photoacoustic and Ultrasonic Imaging
Thermography and Photoacoustic Techniques
Publication details
- Journal / source
- Analytical Chemistry
- Publisher
- American Chemical Society (ACS)
- Volume
- 98
- Issue
- 9
- Pages
- 7050–7056
- Publication date
- 27 February 2026
- Language
- EN