Ppb-Level Miniaturized Flow Gas Sensor Based on Photoacoustic Spectroscopy With Advanced 3-D Printed T-Type Resonant Cell

被引：0
作者：
Feng, Zhiyu [1 ,2 ]
Sima, Chaotan [1 ,2 ]
Li, Tailin [1 ]
Ai, Yan [1 ]
Tong, Chen [1 ]
Wang, Wenzhe [1 ]
Lu, Ping [1 ,2 ]
机构：
[1] Huazhong Univ Sci & Technol, Natl Engn Res Ctr Next Generat Internet Access Sy, Sch Opt & Elect Informat, Wuhan 430074, Peoples R China
[2] Opt Valley Lab, Wuhan 430074, Hubei, Peoples R China
来源：
IEEE SENSORS JOURNAL | 2024年 / 24卷 / 21期
基金：
中国国家自然科学基金;
关键词：
3-D printing; flowing gas detection; photoacoustic spectroscopy; trace acetylene sensing; tube effect;
D O I：
10.1109/JSEN.2024.3459418
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
We present a highly sensitive, miniaturized flow gas sensor with advanced T-type photoacoustic cell (TPAC) for dynamic trace gas detection. The tube effect inside the TPAC was innovatively discovered and analyzed, which would affect the acoustic excitation mode, leading to a first-order cylindrical resonance mode with three operating frequencies. A TPAC with a rounded transition cross section was proposed, as well as its acoustic and fluid properties were investigated. The geometry of the transition section and the tube was further optimized to reduce the flow noise and enhance the signal. The TPAC was 3-D printed with a volume of 5.7 mL. The wavelength modulation spectroscopy and second-harmonic (WMS-2f) technique was applied in the gas sensor. At a flow rate of 50 mL/min of acetylene, the minimum detection limit (MDL) reached 64.5 ppb with 1-s integration time, corresponding to a normalized noise equivalent absorption (NNEA) coefficient of 1.28 x 10(-8) cm(-1) . W . Hz(-1/2). With the relatively large flow rate up to 500 mL/min, the signal-to-noise ratio (SNR) stayed above 60 dB and the MDL was measured to be 277.7 ppb. This work allows new perspectives for the applications of photoacoustic spectroscopy.
引用
收藏
页码：33962 / 33969
页数：8
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