Li Biao, Feng Chaofan, Wu Hongpeng, Jia Suotang, Dong Lei
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.
Photoacoustics. 2022 Aug 9;27:100388. doi: 10.1016/j.pacs.2022.100388. eCollection 2022 Sep.
A breath sensor for real-time measurement of human exhaled carbon monoxide is reported. This breath sensor is based on a novel photoacoustic heterodyne gas sensing technique, which combines the conventional photoacoustic spectroscopy with the beat-frequency detection algorithm, thus offering a fast response time and a convenient optical alignment, as well as eliminating the needs for frequency calibration and wavelength locking. The principle of photoacoustic heterodyne gas sensing was explained in detail. The performance of the photoacoustic heterodyne breath sensor was evaluated in terms of minimum detection limit, response time, and linearity. The exhaled carbon monoxide levels of eight volunteers were measured and the results demonstrate the reliability and feasibility of this breath sensor.
报道了一种用于实时测量人体呼出一氧化碳的呼吸传感器。这种呼吸传感器基于一种新型光声外差气体传感技术，该技术将传统光声光谱与拍频检测算法相结合，从而提供快速响应时间和便捷的光学对准，同时消除了频率校准和波长锁定的需求。详细解释了光声外差气体传感的原理。从最低检测限、响应时间和线性度方面评估了光声外差呼吸传感器的性能。测量了八名志愿者呼出的一氧化碳水平，结果证明了这种呼吸传感器的可靠性和可行性。
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