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Updated: Feb 28, 2026
Three-dimensional Optical-resolution Photoacoustic Microscopy
Published on: May 3, 2011
Dual-Path Excitation Multiquartz-Enhanced Photoacoustic Spectroscopy
Zhijin Shang1, Yashan Fan1, Shuai Shi1
1Shanxi Engineering Research Center of Precision Measurement and Online Detection Equipment and School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China.
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 H2O detection at normal atmospheric pressure with a calculated normalized noise equivalent absorption coefficient of 1.23 × 10-8 cm-1W/√Hz.
