摘要
采用8μm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125m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1s的积分时间内为7.3μg/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。
The results of HONO trace detection using mid-infrared tunable laser absorption spectroscopy technology based on the 8μm 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 NO, analyzer, and the minimum detectable HONO concentration is found to be about 7.3 μg/m^3 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.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2013年第4期276-282,共7页
Acta Optica Sinica
基金
国家863计划(2007AA06Z420)
国家自然科学基金青年科学基金项目(11204319)资助课题
