光学学报, 2013, 33 (4): 0430002, 网络出版: 2013-03-05
基于室温连续量子级联激光器的HONO气体检测
Nitrous Acid Measurement Based on Room-Temperature Continuous Wave Quantum Cascade Laser
光谱学 可调谐半导体激光吸收光谱 量子级联激光器 亚硝酸 spectroscopy tunable diode laser absorption spectroscopy quantum cascade laser nitrous acid
摘要
采用8 μm室温连续量子级联激光器开展对HONO的痕量监测。利用纯甲烷气体估算和描述该装置的特性,用直接吸收光谱技术结合125 m的多次反射吸收池进行HONO气体检测。由H2SO4和NaNO2发生化学反应而产生的HONO气体浓度用一个溶蚀器系统和一个NOx分析仪来量化,得到HONO的最低探测浓度在1 s的积分时间内为7.3 μg/m3。研究了由光学池壁表面而导致的HONO的衰减效应并得到一个反应率常数,这个常数有望应用于真实大气HONO的现场测量,特别是采用吸收池的测量。
Abstract
The results of HONO trace detection using mid-infrared tunable laser absorption spectroscopy technology based on the 8 μm room-temperature continuous wave quantum cascade laser are reported. The characteristics of the device are estimated and described with pure methane gas. Direct absorption spectroscopy is applied to trace gaseous HONO detection via a 125 m long multi-pass cell. The sensitivity of the instrument is evaluated using HONO sample generated by chemical reaction of H2SO4 and NaNO2. The generated HONO concentration is quantified by means of a denuder system associated with a conventional NOx analyzer, and the minimum detectable HONO concentration is found to be about 7.3 μg/m3 in 1 s integrated time. HONO losses resulting from the optical cell wall are experimentally investigated. The rate constant of HONO determined in the present work might be helpful for future field measurements of HONO, especially when an absorption cell is used.
崔小娟, 董凤忠, 陈卫东, 刘文清, Eric Fertein. 基于室温连续量子级联激光器的HONO气体检测[J]. 光学学报, 2013, 33(4): 0430002. Cui Xiaojuan, Dong Fengzhong, Chen Weidong, Liu Wenqing, Eric Fertein. Nitrous Acid Measurement Based on Room-Temperature Continuous Wave Quantum Cascade Laser[J]. Acta Optica Sinica, 2013, 33(4): 0430002.