Quartz Enhanced Photoacoustic Detection Based on an Elliptical Laser Beam
Source abstract
Abstract
A quartz enhanced photoacoustic spectroscopy (QEPAS) sensor system based on an elliptical laser beam for trace gas detection was demonstrated. A Powell lens was exploited to shape the circular laser beam into an elliptical laser beam for the full utilization of the quartz tuning fork (QTF) prong spacing. Based on the finite element modeling (FEM) simulation software COMSOL, the distribution of acoustic pressure on QTF prongs with different beam shapes was simulated theoretically. The experimental results showed that the QEPAS signal based on the elliptical laser beam had a 1.4-fold improvement compared with the circular laser beam, resulting in a minimum detection limit of 418.6 ppmv and the normalized noise equivalent absorption (NNEA) of 1.51 × 10−6 cm−1 W/√Hz at atmospheric pressure.
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Research context
OpenAlex topics: Spectroscopy and Laser Applications · Atmospheric and Environmental Gas Dynamics · Atmospheric Ozone and Climate
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
Funding
National Natural Science Foundation of China · National Key R&D Program of China · Changjiang Scholars 244 and Innovative Research Team in University of Ministry of Education of China · 111 project · Outstanding Innovative Teams of Higher Learning Institutions of Shanxi, Foundation for Selected 246 Young Scientists Studying Abroad, Sanjin Scholar
References (33)
Show source-provided references
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