Abstract
In this letter, a quartz-enhanced photoacoustic spectroscopy (QEPAS) based trace gas sensor using a quartz tuning fork (QTF) with resonant frequency of 40 kHz as the acoustic wave transducer was demonstrated for the first time. A 1.395 μm continuous wave (CW), fiber-coupled distributed feedback (DFB) diode laser was employed as the exciting source. Water vapor was selected as the target gas, and wavelength modulation spectroscopy (WMS) with 2nd harmonic detection was utilized. After optimization of the laser modulation depth, a minimum detection limit (MDL) of 139 ppmv was obtained.
| Original language | English |
|---|---|
| Pages (from-to) | 351-353 |
| Number of pages | 3 |
| Journal | Optoelectronics and Advanced Materials, Rapid Communications |
| Volume | 10 |
| Issue number | 5-6 |
| State | Published - 1 May 2016 |
Keywords
- Quartz tuning fork
- Quartz-enhanced photoacoustic spectroscopy
- Resonant frequency
- Water vapor
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