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

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ppb-Level SO2 Photoacoustic Sensors with a Suppressed Absorption-Desorption Effect by Using a 7.41 μm External-Cavity Quantum Cascade Laser.
ACS Sensors ( IF 8.2 ) Pub Date : 2020-01-24 , DOI: 10.1021/acssensors.9b02448
Xukun Yin _{1,

2,

3} , Hongpeng Wu _{1,

2} , Lei Dong _{1,

2} , Biao Li _{1,

2} , Weiguang Ma _{1,

2} , Lei Zhang _{1,

2} , Wangbao Yin _{1,

2} , Liantuan Xiao _{1,

2} , Suotang Jia _{1,

2} , Frank K Tittel ₃

Affiliation

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 μm for the strongest SO2 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 1σ detection limit of 2.45 ppb, corresponding to a normalized noise equivalent absorption value of 3.32 × 10-9 cm-1 W/Hz1/2, was achieved after measures for suppressing the absorption-desorption effect were taken.

中文翻译：

ppb级SO2光声传感器，通过使用7.41μm外腔量子级联激光器抑制吸收-解吸作用。

通过使用具有外部衍射光栅腔几何形状的连续波室温，高功率量子级联激光器（QCL），开发了一种用于检测ppb级二氧化硫（SO2）的灵敏光声传感器系统。QCL的激发波长设置为7.41μm，以获得最强的SO2吸收线强度。具有两个相同谐振器的定制差分光声电池（PAC）设计为允许气体流速高达1200 sccm。为了了解PAC壁中SO2的动态吸附和解吸过程，采用了定性理论模型。在采取了抑制吸收-解吸效果的措施之后，获得了1.45的检测下限（2.45 ppb），对应于3.32×10-9 cm-1 W / Hz1 / 2的归一化噪声等效吸收值。

更新日期：2020-01-24

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