光学学报, 2020, 40 (11): 1130001, 网络出版: 2020-06-10   

基于中红外中空波导光纤的呼吸气体CO2实时测量 下载: 1143次

Real-Time Exhaled CO2 Gas Measurement Using a Mid-Infrared Hollow Waveguide Fiber
作者单位
南昌航空大学无损检测教育部重点实验室, 江西 南昌 330063
摘要
提出一种基于中红外中空波导光纤的呼吸气体CO2测量系统,该系统使用中心波长为2.73 μm的分布式反馈(DFB)激光器结合1 m长的中空波导光纤,采用免标定波长调制光谱技术(CF-WMS)对呼吸气体CO2进行实时测量。采用CF-WMS技术得到的CO2气体浓度与配制所得的标准气体浓度之间的线性度为0.9999,在体积分数为0%~6%的范围内,测量结果与标准气体体积分数值之间的最大绝对误差为0.01%。由CF-WMS 技术反演的CO2体积分数精度为1.01×10 -5,在最佳积分时间26.00 s时,CO2气体的探测极限为1.3×10 -6。基于CF-WMS技术与传统的标定式波长调制技术(WMS)测量CO2气体体积分数的精度和灵敏度,并将两者进行比较,结果发现CF-WMS技术相对于WMS技术,测量精度提高了一倍,CF-WMS技术测量灵敏度为WMS技术测量灵敏度的1.4倍。对呼吸气体CO2实时测量时,采用CF-WMS技术测量的背景CO2体积分数基本稳定在3.8×10 -4左右,呼吸末CO2体积分数稳定在5.7%附近。
Abstract
In this study, we propose an exhaled CO2 gas measurement system based on a mid-infrared hollow waveguide fiber. A distributed-feedback (DFB) laser with a central wavelength of 2.73 μm and a 1-m hollow waveguide fiber were used in the proposed system. The exhaled CO2 gas was measured in real time via calibration-free wavelength modulation spectroscopy (CF-WMS). The linearity with respect to the CO2 concentration obtained via CF-WMS and the prepared standard CO2 gas concentration is 0.9999. Further, when the volume fraction is 0%--6%, the maximum absolute error between the measurement results and the volume fractions of the standard gas is 0.01%. The precision of the CO2 volume fraction retrieved via CF-WMS is 1.01×10 -5, and the CO2 gas detection limit is 1.3×10 -6 at an optimal integration time of 26.00 s. Subsequently, the measurement accuracy and measurement sensitivity of CF-WMS and the traditional calibrated wavelength modulation spectroscopy (WMS) were compared. The obtained results demonstrate that the measurement accuracy and measurement sensitivity of CF-WMS are twice and 1.4 times those of WMS, respectively. The background CO2 volume fraction obtained via CF-WMS is observed to remain stable at approximately 3.8×10 -4 during real-time measurement of the exhaled CO2 gas; further, the CO2 volume fraction observed immediately after exhalation remains stable at approximately 5.7%.

马帅, 吴涛, 孙城林, 周韬, 何兴道. 基于中红外中空波导光纤的呼吸气体CO2实时测量[J]. 光学学报, 2020, 40(11): 1130001. Shuai Ma, Tao Wu, Chenglin Sun, Tao Zhou, Xingdao He. Real-Time Exhaled CO2 Gas Measurement Using a Mid-Infrared Hollow Waveguide Fiber[J]. Acta Optica Sinica, 2020, 40(11): 1130001.

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