基于单个量子级联激光器的大气多组分测量方法

发布时间：2018-07-17 15:16

【摘要】：利用单个新型中红外量子级联激光器作为激光光源,结合长程光学吸收池技术开展了大气多组分同时测量方法的研究.通过结合基于自适应性Savitzky-Golay滤波的数据处理算法,有效地提高了系统检测灵敏度和光谱分辨率.研究结果表明,在1 s的时间分辨率和1 atm压力条件下,采用二次微分探测技术可实现CO,N_2O和H_2O测量精度分别为8.20 ppb,7.90 ppb和64.00 ppm(1 ppb=10~(-9),1 ppm=10~(-6));通过提高信号平均时间,在最佳的积分时间(85 s)时,系统可实现的最小检测限分别为1.25 ppb(CO),1.15 ppb(N_2O)和35.77 ppm(H_2O).整个系统具有结构紧凑,成本相对较低,通过选择其他波段的量子级联激光器的激光光源,即可实现对其他分子的实时分析.本系统可广泛应用于大气化学等领域的应用研究.
[Abstract]:A new type of mid-infrared quantum cascade laser is used as the laser light source and the multi-component simultaneous measurement method of atmosphere is studied in combination with the long range optical absorption cell technology. By combining the data processing algorithm based on adaptive Savitzky-Golay filter, the detection sensitivity and spectral resolution of the system are improved effectively. The results show that under the condition of 1 s time resolution and 1 atm pressure, the measurement accuracy of CON _ 2O and H _ 2O can be 8.20 ppb _ 2O 7.90 ppb and 64.00 ppm (1 ppb ~ (-9) ~ (-1 ppm ~ (-9) ~ (-1) ppm ~ (-6);) by increasing the mean signal time by using the second-order differential detection technique. The minimum detectable limits of the system are 1.25 ppb (CO) 1.15 ppb (N2O) and 35.77 ppm (H2O) at the best integral time (85 s). The whole system has compact structure and relatively low cost. The real-time analysis of other molecules can be realized by selecting the laser light source of quantum cascade lasers in other bands. The system can be widely used in the field of atmospheric chemistry.
【作者单位】：安徽大学光电信息获取与控制教育部重点实验室;
【基金】：国家重点研发计划(批准号:2016YFC0302202) 国家自然科学基金(批准号:61675005,61440010) 安徽省自然科学基金(批准号:1508085MF118) 安徽省科技攻关项目(批准号:1501041136) 安徽省留学回国人员科技活动资金(批准号:J05015143) 安徽大学人才引进基金(批准号:10117700014) 学校创新训练和科研训练计划(批准号:J10118515790,J10118520289)资助的课题~~
【分类号】：TN248

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