Rapid formaldehyde monitoring in ambient air by means of mid-infrared cavity leak-out spectroscopy
Rapid formaldehyde monitoring in ambient air by means of mid-infrared cavity leak-out spectroscopy
复制标题
DOI：
10.1007/s00340-002-0986-5
复制
发表时间：
2002-09-01
影响因子：
2.1
通讯作者：
Mürtz, M
中科院分区：
文献类型：
--
作者：
Dahnke, H;Von Basum, G;Mürtz, M
我们报告了使用腔泄漏光谱法（腔衰荡光谱法的一种连续波变体）对环境空气中甲醛的光谱检测。该技术被证明适用于污染空气的实时定量分析，而无需对空气样品进行任何预处理。使用可调谐CO-泛音边带激光器的; = 3妈妈的光谱区域和衰荡细胞与R = 99.95%的镜子，我们实现了检测限为2十亿分之二的甲醛在环境空气中，相应的最小可检测的吸收系数为7 × 10（-9）/cm（采样时间：2秒）。校准所产生的分子的极性和由于HITRAN数据库的不确定性的问题进行了讨论。
We report the spectroscopic detection of formaldehyde in ambient air using cavity leak-out spectroscopy, a cw variant of cavity ring-down spectroscopy. This technique proved to be suitable for a real-time quantitative analysis of polluted air without any preprocessing of the air sample. Using a tunable CO-overtone sideband laser for the; = 3 mum spectral region and a ring-down cell with R = 99.95% mirrors, we achieved a detection limit of 2 parts per billion formaldehyde in ambient air, corresponding to a minimum detectable absorption coefficient of 7 x 10(-9)/cm (sampling time: 2 s). Calibration problems arising from the polarity of the molecule and due to HITRAN database uncertainties are discussed.