Laser-based systems for trace gas detection in life sciences
Laser-based systems for trace gas detection in life sciences
复制标题
DOI：
10.1007/s00340-008-3092-5
复制
发表时间：
2008-09-01
影响因子：
2.1
通讯作者：
Harren, F. J. M.
中科院分区：
文献类型：
--
作者：
Cristescu, S. M.;Persijn, S. T.;Harren, F. J. M.
红外气相光谱在许多生命科学应用中变得非常普遍。在这里，我们提出了三种类型的痕量气体检测系统的基础上，CO2激光器和连续波（cw）光参量振荡器（OPO）结合光声光谱和连续波量子级联激光器（QCL）结合波长调制光谱。举例说明了CO2激光系统对植物和微生物中各种动态过程以及汽车尾气中乙烯排放的真实的实时监测的适用性。基于OPO的检测器的多功能性通过同时检测C-13-甲烷和C-12-甲烷（在3240 nm处）以按体积计每十亿份0.1的相似检测限来证明。介绍了使用连续波QCL（输出功率25 mW，调谐范围1891-1908 cm（-1））的基于QCL的光谱仪的最新进展，并与标准化学发光仪器进行了比较，用于分析呼出气中的NO。
Infrared gas phase spectroscopy is becoming very common in many life science applications. Here we present three types of trace gas detection systems based on CO2 laser and continuous wave (cw) optical parametric oscillator (OPO) in combination with photoacoustic spectroscopy and cw quantum cascade laser (QCL) in combination with wavelength modulation spectroscopy. Examples are included to illustrate the suitability of CO2 laser system to monitor in real time ethylene emission from various dynamic processes in plants and microorganisms as well as from car exhausts. The versatility of an OPO-based detector is demonstrated by simultaneous detection of C-13-methane and C-12-methane (at 3240 nm) at similar detection limits of 0.1 parts per billion by volume. Recent progress on a QCL-based spectrometer using a continuous wave QCL (output power 25 mW, tuning range of 1891-1908 cm(-1)) is presented and a comparison is made to a standard chemiluminescence instrument for analysis of NO in exhaled breath.