We demonstrate a trace gas sensor to measure the water vapor (H2O) 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.
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Dang, H., Ma, Y., Li, Y. et al. High-Sensitivity Detection of Water Vapor Concentration: Optimization and Performance. J Russ Laser Res 39, 95–97 (2018). https://doi.org/10.1007/s10946-018-9694-4
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DOI: https://doi.org/10.1007/s10946-018-9694-4