ppb-Level SO2 Photoacoustic Sensors with a Suppressed Absorption-Desorption Effect by Using a 7.41 μm External-Cavity Quantum Cascade Laser

被引：130

作者：

Yin, Xukun ^{[1
,2
,3
]}

Wu, Hongpeng ^{[1
,2
]}

Dong, Lei ^{[1
,2
]}

Li, Biao ^{[1
,2
]}

Ma, Weiguang ^{[1
,2
]}

Zhang, Lei ^{[1
,2
]}

Yin, Wangbao ^{[1
,2
]}

Xiao, Liantuan ^{[1
,2
]}

Jia, Suotang ^{[1
,2
]}

Tittel, Frank K. ^{[3
]}

机构：

[1] Shanxi Univ, Inst Laser Spect, State Key Lab Quantum Opt & Quantum Opt Devices, Taiyuan 030006, Peoples R China

[2] Shanxi Univ, Collaborat Innovat Ctr Extreme Opt, Taiyuan 030006, Peoples R China

[3] Rice Univ, Dept Elect & Comp Engn, Houston, TX 77005 USA

来源：

ACS SENSORS | 2020年 / 5卷 / 02期

基金：

美国国家科学基金会; 中国国家自然科学基金;

关键词：

photoacoustic spectroscopy; trace gas sensor; adsorption-desorption effects; quantum cascade lasers; differential photoacoustic cell; sulfur dioxide detection; SPECTROSCOPY-BASED SENSOR; DIOXIDE DETECTION; GAS SENSOR; H2S; OXIDE; CELL; CO;

D O I：

10.1021/acssensors.9b02448

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A sensitive photoacoustic sensor system for the detection of ppb-level sulfur dioxide (SO2) was developed by the use of a continuous-wave room-temperature, high-power quantum cascade laser (QCL) with an external diffraction grating cavity geometry. The excitation wavelength of the QCL was set to 7.41 mu m for the strongest SO 2 absorption line strength. A custom-made differential photoacoustic cell (PAC) with two identical resonators was designed to allow a gas flow rate up to 1200 sccm. A qualitative theoretical model was employed in order to understand the dynamic adsorption and desorption processes of SO2 in the PAC walls. A 1 sigma detection limit of 2.45 ppb, corresponding to a normalized noise equivalent absorption value of 3.32 X 10(-9) cm(-1) W/Hz(1/2), was achieved after measures for suppressing the absorption-desorption effect were taken.

引用

页码：549 / 556

页数：15

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