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Fiber-ring laser intracavity QEPAS gas sensor using a 7.2 kHz quartz tuning fork.
- Source :
-
Sensors & Actuators B: Chemical . Sep2018, Vol. 268, p512-518. 7p. - Publication Year :
- 2018
-
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 7.2 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 1.5 cm, significantly extending the linear dynamic range of the gas sensor to an order of 10 5 . As a proof of principle, the fiber laser was tuned to the C 2 H 2 absorption line at 1531.6 nm. Operating at the optimal gas pressure and modulation depth selected for wavelength modulation spectroscopy, a minimum detectable C 2 H 2 concentration of 29 ppbv at 300-s integration time has been achieved. [ABSTRACT FROM AUTHOR]
- Subjects :
- *GAS detectors
*PHOTOACOUSTIC spectroscopy
*QUARTZ
*ERBIUM
*RING lasers
Subjects
Details
- Language :
- English
- ISSN :
- 09254005
- Volume :
- 268
- Database :
- Academic Search Index
- Journal :
- Sensors & Actuators B: Chemical
- Publication Type :
- Academic Journal
- Accession number :
- 129507935
- Full Text :
- https://doi.org/10.1016/j.snb.2018.04.139