Qiao Shunda, He Ying, Ma Yufei
Opt Lett. 2021 May 15;46(10):2449-2452. doi: 10.1364/OL.423801.
A single-quartz-enhanced dual spectroscopy (S-QEDS)-based trace gas sensor is reported for the first time, to the best of our knowledge. In S-QEDS, a quartz tuning fork (QTF) was utilized to detect the photoacoustic and photothermal signals simultaneously and added the two signals together. The S-QEDS technique not only improved the detection performance but also avoided the issue of resonant frequency mismatching of QTFs for the multi-QTFs-based sensor systems. Water vapor (${\rm H}_2{\rm O}$) was selected as the target gas to investigate the S-QEDS sensor performance. The photoacoustic, photothermal, and composited signals were measured, respectively, under the same conditions. The experimental results verified the ideal adding of the photoacoustic and photothermal signals by using a single QTF in this S-QEDS sensor system.
据我们所知，首次报道了一种基于单石英增强双光谱（S-QEDS）的痕量气体传感器。在S-QEDS中，使用石英音叉（QTF）同时检测光声信号和光热信号，并将这两个信号相加。S-QEDS技术不仅提高了检测性能，还避免了基于多QTF的传感器系统中QTF的共振频率失配问题。选择水蒸气（H₂O）作为目标气体来研究S-QEDS传感器的性能。在相同条件下分别测量了光声信号、光热信号和复合信号。实验结果验证了在该S-QEDS传感器系统中使用单个QTF对光声信号和光热信号进行理想相加的情况。
