光电探测器
量子级联激光器
材料科学
光谱学
光学
光电子学
红外线的
时滞与积分
光声光谱学
探测器
一氧化碳
吸收(声学)
激光器
化学
物理
太赫兹辐射
催化作用
量子力学
生物化学
作者
Shunda Qiao,Yufei Ma,Yaning He,Pietro Patimisco,Angelo Sampaolo,Vincenzo Spagnolo
出处
期刊:Optics Express
[The Optical Society]
日期:2021-07-21
卷期号:29 (16): 25100-25100
被引量:73
摘要
In this paper, we report on an ultra-highly sensitive light-induced thermoelastic spectroscopy (LITES)-based carbon monoxide (CO) sensor exploiting custom quartz tuning forks (QTFs) as a photodetector, a multi-pass cell and a mid-infrared quantum cascade laser (QCL) for the first time. The QCL emitting at 4.58 µm with output power of 145 mW was employed as exciting source and the multi-pass cell was employed to increase the gas absorption pathlength. To reduce the noise level, wavelength modulation spectroscopy (WMS) and second harmonic demodulation techniques were exploited. Three QTFs including two custom QTFs (#1 and #2) with different geometries and a commercial standard QTF (#3) were tested as photodetector in the gas sensor. When the integration time of the system was set at 200 ms, minimum detection limits (MDLs) of 750 part-per-trillion (ppt), 4.6 part-per-billion (ppb) and 5.8 ppb were achieved employing QTF #1 #2, and #3, respectively. A full sensor calibration was achieved using the most sensitive QTF#1, demonstrating an excellent linear response with CO concentration.
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