摘要
人体呼出气体中CO2和水汽的浓度变化与身体状况密切相关,因此对其浓度进行检测具有重要意义。提出一种基于2.73μm分布反馈式激光器的呼出气体检测装置,选取3659.402cm-1和3659.934cm-1处的谱线,利用波长调制光谱技术分别对人体呼出气体中的CO2和水汽同时进行测量。结果表明:利用二次谐波信号对气体浓度进行定标,当CO2和水汽的体积分数分别小于35%和2.3%时,线性度分别达到0.99945和0.99679;对呼吸循环过程中CO2和水汽的浓度进行实时测量,积分时间为0.92s时,探测灵敏度分别为4.33×10-3和1.37×10-4;在采集时间为56.8s时,CO2的探测精度为0.12%,在最佳积分时间为17min时,CO2的探测极限可达到1.49×10-4。
The concentration changes of exhaled carbon dioxide and water vapor are closely related to the physical condition.Therefore,it is of great significance to detect their concentrations.An exhaled gas detection device based on a 2.73μm distributed feedback laser is proposed.Spectral lines at 3659.402cm-1 and 3659.934cm-1 are selected to measure carbon dioxide and water vapor respectively by using the wavelength modulation spectroscopy.The results show that using the second harmonic signal to calibrate the gas concentration,the linearity of 0.99945 and 0.99679 is obtained when the volume fractions of carbon dioxide and water vapor are less than 35% and 2.3%,respectively.The concentrations of carbon dioxide and water vapor during the respiratory cycle are measured in real time.With the measurement time of 0.92 s,the sensor achieves a detection sensitivity of 4.33×10-3 and 1.37×10-4for carbon dioxide and water vapor,respectively.At the acquisition time of 56.8s,the detection accuracy with 0.12% of carbon dioxide is achieved,and a detection limit of 1.49×10-4 at the optimal integration time of 17 min is achieved for carbon dioxide measurement.
作者
吴涛
张怀林
孔维平
何兴道
陈忠平
陈卫东
Wu Tao;Zhang Huailin;Kong Weiping;He Xingdao;Chen Zhongping;Chen Weidong(School of Measuring and Optical Engineering,Nanchang Hangkong University, Nanchang,Jiangxi 330063,China;Laboratoire de Physicochimie de lAtmosphere,Universitedu Littoral Cote dOpale ,Dunkerque 59140,France)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2018年第12期402-409,共8页
Acta Optica Sinica
基金
国家自然科学基金(41265011)
江西省科技厅重点研发计划(20171BBG70003)
人社部留学人员科技活动项目择优资助项目
关键词
光谱学
呼出气体分析
波长调制光谱技术
激光吸收光谱
CO2
水汽
spectroscopy
exhaled gas analysis
wavelength modulation spectroscopy
laser absorption spectroscopy
carbon dioxide
water vapor
