中红外大气甲烷乙烷双组分气体的同步移动监测

为了实现大范围、长距离的大气烷烃气体检测, 将研制的中红外双组分甲烷、乙烷传感器以车载方式, 对某一地区的大气甲、乙烷含量进行了移动探测。该传感器系统采用中红外室温连续的带间级联激光器(ICL)作为光源, 采用高速数据采集卡采集信号, 利用上位机LabVIEW平台编写程序产生激光器扫描及调制信号、获取探测器信号并提取二次谐波, 通过计算, 确定大气烷烃气体浓度。根据气体采样时间、实时风速及车速, 计算得到系统的响应时间为82.5 s, 实验测量为85~95 s, 与理论一致。对系统噪声水平进行测试, 实验室中甲烷浓度波动为±40 nL/L, 乙烷波动为±2 nL/L, 车载过程甲烷浓度波动为+40至-80 nL/L, 乙烷波动为±4 nL/L。为验证传感器性能, 与美国Aeries公司的商用传感器结果做了对比, 二者呈现较好的一致性。最后, 给出了车载传感器系统在某条线路上的甲烷、乙烷浓度移动探测结果, 以及某小区甲烷、乙烷浓度的二维分布测绘结果, 分析了二种烷烃气体的变化关系。本文所开展的工作为探测烷烃气体泄漏并监测大气质量提供了技术保障。

Abstract

For realizing atmospheric alkane gas detection in a wide area and a long distance, a dual-gas simultaneous methane (CH4) and ethane (C2H6) sensor system was demonstrated. Measurements were conducted in an area. A Continuous-Wave (CW) Interband Cascade Laser (ICL) was used as the light source, a high-speed Data Acquisition card (DAQ) was used to acquire the detection signal, and a LabVIEW based laptop platform was developed for signal generation, signal acquisition, harmonic extraction, concentration calculation, and display. Considering sampling period, local wind speed, and vehicle speed, the calculated response time is 82.5 s, and the measurement time is 85-90 s. The noise level of CH4 is ± 40 nL/L and C2H6 is ± 2 nL/L in the laboratory, while CH4 is from +40 to -80 nL/L and C2H6 is ± 4 nL/L in mobile conditions. Furthermore, a good agreement was found between this sensor and a commercial sensor from Aeries, USA. Concentration measurements of CH4 and C2H6 along a street and a 2-D concentration distribution in one block were shown. The varied relationship between these two kinds of gases was analyzed. This work provides a technique for detecting the leakage of alkane gases and monitoring the atmospheric gases.

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叶玮琳, 周波, 余红志, 孟永贤, 郑传涛. 中红外大气甲烷乙烷双组分气体的同步移动监测[J]. 光学精密工程, 2018, 26(8): 1938. YE Wei-lin, ZHOU Bo, YU Hong-zhi, MENG Yong-xian, ZHENG Chuan-tao. In-motion monitoring of atmospheric methane and ethane using a mid-infrared dual-gas simultaneous detection sensor[J]. Optics and Precision Engineering, 2018, 26(8): 1938.

中红外大气甲烷乙烷双组分气体的同步移动监测

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