Sun Bo, Zifarelli Andrea, Wu Hongpeng, Dello Russo Stefano, Li Shangzhi, Patimisco Pietro, Dong Lei, Spagnolo Vincenzo
State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China.
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China.
Anal Chem. 2020 Oct 20;92(20):13922-13929. doi: 10.1021/acs.analchem.0c02772. Epub 2020 Oct 1.
An optical sensor for highly sensitive detection of carbon monoxide (CO) in sulfur hexafluoride (SF) was demonstrated by using the quartz-enhanced photoacoustic spectroscopy technique. A spectrophone composed of a custom 8 kHz T-shaped quartz tuning fork with grooved prongs and a pair of resonator tubes, to amplify the laser-induced acoustic waves, was designed aiming to maximize the CO photoacoustic response in SF. A theoretical analysis and an experimental investigation of the influence of SF gas matrix on spectrophone resonance properties for CO detection have been provided, and the performances were compared with the standard air matrix. A mid-infrared quantum cascade laser with a central wavelength at 4.61 μm, resonant with the fundamental band of CO, and an optical power of 20 mW was employed as the light excitation source. A minimum detection limit of 10 ppb at 10 s of integration time was achieved, and a sensor response time of ∼3 min was measured.
通过使用石英增强光声光谱技术，展示了一种用于高灵敏度检测六氟化硫（SF）中一氧化碳（CO）的光学传感器。设计了一种分光电话，它由一个定制的8 kHz T形石英音叉（带有带槽叉指）和一对谐振管组成，用于放大激光诱导的声波，旨在使SF中CO的光声响应最大化。提供了关于SF气体基质对用于CO检测的分光电话共振特性影响的理论分析和实验研究，并将性能与标准空气基质进行了比较。使用中心波长为4.61μm、与CO的基频共振且光功率为20 mW的中红外量子级联激光器作为光激发源。在10 s积分时间内实现了10 ppb的最低检测限，并测量到传感器响应时间约为3分钟。
