高精度中红外大气C2H6传感系统的研制  

High-Accuracy Mid-Infrared Atmospheric Ethane Sensing System

作　　者：叶玮琳 孟永贤 周波 余红志 何迅 吴福培 郑志丹[1] 郑传涛 Ye Weilin1, Meng Yongxian1, Zhou BO1, Yu Hongzhi1, He Xun1, Wu Fupei1, Zheng Zhidan1, Zheng Chuantao2(1Intelligent Manufacturing Key Laboratory of Ministry of Education, Shantou University Shantou, Guangdong 515063, China; 2 State Key Laboratory on Integrated Optoelectronics, Jilin University Region, College of Electronic Science and Engineering, Jilin University, Changchun, Jilin 130012, Chin)

机构地区：[1]汕头大学智能制造技术教育部重点实验室,广东汕头515063 [2]吉林大学电子科学与工程学院,集成光电子学国家重点联合实验室吉林大学实验区,吉林长春130012

出　　处：《光学学报》2018年第3期212-216,共5页Acta Optica Sinica

基　　金：国家自然科学基金(61775079,61627823,61307124)、广东省自然科学基金(2015A030313442)、广东省高等学校优秀青年教师培养计划(YQ2015071)、广东省科技计划(2017A020216011)、国家留学基金(201508440112)

摘　　要：C_2H_6作为温室气体之一,对光化学污染的产生和臭氧层的破坏具有促进作用。C_2H_6在大气中的含量极低,对传感器的探测精度具有较高要求。报道了一种使用中红外连续波长带间级联激光器(ICL)检测大气中C_2H_6浓度的传感器,其测量精度可达到10^(-9)量级。采用容积为220mL、光程为54.6m的多通池增加气体吸收光程,降低检测下限,提高灵敏度。采用LabVIEW虚拟仪器平台编程产生激光器扫描、调制信号及其叠加,通过数据采集卡(DAQ)输出到ICL驱动源。通过DAQ读取探测器输出信号,由LabVIEW程序进行信号的锁相放大及二次谐波提取。实验结果表明:当系统采样时间为1.67s时,阿伦标准差为1.86×10^(-9),且阿伦标准差在平均时间为775s时达到最小值,即系统达到最佳稳定度,为0.026×10^(-9)。将该系统放置于燃气站进行检测实验,证明所研制的C_2H_6传感器具有实用价值。As one of the greenhouse gases, ethane can promote the generation of photochemical pollution and destruction of ozone. Due to its extremely low concentration in the atmosphere, it requires a sensor with high accuracy for measurement. A continuous-wave interband cascade laser （ICL） based on mid-infrared sensor system with high-precision of 10-9 level is demonstrated for detection of ethane in atmospheric. A multi-pass gas cell with volume of 220 mL and an optical path of 54.6 m is used. The LabVIEW visual instrument platform is used to program the scan and modulation signal as well as their superposition. A date acquisition （DAQ） card is employed to output the signal of the ICL driver. The output signal from detector is acquired by the DAQ and programmed by LabVIEW for data processing such as lock-in amplifier and second-harmonic extraction. Experimental results show that an Allan deviation of 1.86×10-9 for ethane with an averaging time of 1.67 s is achieved, and it is as low as 0.026×10-9 at an averaging time of 775 s. Outdoor atmospheric ethane concentration measurement is carried out in a compressed natural gas station. The experimental result shows that this ethane sensor system has a great practical value in application.

关 键 词：传感器 红外光谱学 痕量气体检测 C2H6传感器 

分 类 号：TH83[机械工程—仪器科学与技术]