High-Sensitivity Detection of Water Vapor Concentration: Optimization and Performance

High-Sensitivity Detection of Water Vapor Concentration: Optimization and Performance

We demonstrate a trace gas sensor to measure the water vapor (H 2 O) concentration based on quartzenhanced photoacoustic spectroscopy (QEPAS). Here, the wavelength-modulation spectroscopy (WMS) with the second-harmonic detection is utilized. We add two metallic tubes acting as a microresonator (mR)...

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Veröffentlicht in:Journal of Russian laser research 2018, Vol.39 (1), p.95-97
Hauptverfasser: Dang, Hongtao, Ma, Yufei, Li, Yu, Wan, Shaosong
Format: Artikel
Sprache:eng
Schlagworte:
Gas sensors
Lasers
Microwaves
Modulation
Optical Devices
Optics
Optimization
Photonics
Physics
Physics and Astronomy
RF and Optical Engineering
Sensors
Spectrum analysis
Trace gases
Tubes
Water vapor
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Beschreibung
Zusammenfassung:We demonstrate a trace gas sensor to measure the water vapor (H 2 O) concentration based on quartzenhanced photoacoustic spectroscopy (QEPAS). Here, the wavelength-modulation spectroscopy (WMS) with the second-harmonic detection is utilized. We add two metallic tubes acting as a microresonator (mR) to the quartz tuning fork (QTF) sensor design to improve the sensor signal level. After optimization of the mR dimensions and laser modulation depth, we obtain a minimum detection limit (MDL) of 5.73 ppm.
ISSN:1071-2836
1573-8760
DOI:10.1007/s10946-018-9694-4