Fekete János, Torma Péter, Szabó Anna, Balogh Miklós, Horváth Csaba, Weidinger Tamás, Szabó Gábor, Bozóki Zoltán
Department of Optics and Quantum Electronics, University of Szeged, H-6720 Szeged, Hungary.
ELKH-SZTE Research Group for Photoacoustic Monitoring of Environmental Processes, H-6720 Szeged, Hungary.
Photoacoustics. 2023 Feb 26;30:100469. doi: 10.1016/j.pacs.2023.100469. eCollection 2023 Apr.
High temporal resolution concentration measurements in rapid gas flows pose a serious challenge for most analytical instruments. The interaction of such flows with solid surfaces can generate excessive aero-acoustic noise making the application of the photoacoustic detection method seemingly impossible. Yet, the fully open photoacoustic cell (OC) has proven to be operable even when the measured gas flows through it at a velocity of several m/s. The OC is a slightly modified version of a previously introduced OC based on the excitation of a combined acoustic mode of a cylindrical resonator. The noise characteristics and analytical performance of the OC are tested in an anechoic room and under field conditions. Here we present the first successful application of a sampling-free OC for water vapor flux measurements.
对于大多数分析仪器而言，在快速气流中进行高时间分辨率浓度测量是一项严峻挑战。此类气流与固体表面的相互作用会产生过多的气动声学噪声，使得光声检测方法的应用看似不可能实现。然而，事实证明，即使被测气体以每秒数米的速度流经完全开放式光声池（OC），它仍可运行。该OC是基于圆柱形谐振器的组合声学模式激发而对先前引入的OC进行轻微修改后的版本。在消声室和现场条件下测试了OC的噪声特性和分析性能。在此，我们展示了无采样OC在水汽通量测量中的首次成功应用。
