Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7139374 | Sensors and Actuators B: Chemical | 2018 | 7 Pages |
Abstract
A novel trace gas sensor exploiting fiber-ring laser intracavity quartz-enhanced photoacoustic spectroscopy (FLI-QEPAS) is reported. The gas sensor system couples an erbium-doped fiber-ring laser with a custom-designed quartz tuning fork (QTF) operating at 7.2â¯kHz. The QTF is placed in the fiber cavity to fully utilize intracavity optical power for photoacoustic excitation. We obtained a short intracavity absorption length of 1.5â¯cm, significantly extending the linear dynamic range of the gas sensor to an order of 105. As a proof of principle, the fiber laser was tuned to the C2H2 absorption line at 1531.6â¯nm. Operating at the optimal gas pressure and modulation depth selected for wavelength modulation spectroscopy, a minimum detectable C2H2 concentration of 29â¯ppbv at 300-s integration time has been achieved.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Qiang Wang, Zhen Wang, Wei Ren, Pietro Patimisco, Angelo Sampaolo, Vincenzo Spagnolo,