论文标题
通过吸附富集PPT级苯检测的光声光谱的增强
Enhancement of photoacoustic spectroscopy with sorption enrichment for ppt-level benzene detection
论文作者
论文摘要
展示了苯的实时痕量气体检测器。测量系统在短暂的吸附周期中利用了适度的富集，以达到PPT级检测极限，采样周期为90 s，其中包括样品吸附，解吸和光谱测量。苯在Tenax Ta吸附剂上收集30 s，然后从具有光声光谱的富集样品中检测到。使用悬臂增强的光声光谱和在波长14.8 $μ$ m处发射的连续波量子级联激光器，可以实现高灵敏度，这对应于最强的苯苯红外带的吸收波长。在一个采样周期内，我们达到150 ppt苯的检测极限。评估了湿度和其他常见石化物的干扰。
A real time trace gas detector for benzene is demonstrated. The measurement system takes an advantage of modest enrichment through short adsorption periods to reach a ppt-level detection limit with a sampling cycle of 90 s, which includes sample adsorption, desorption and a spectroscopic measurement. Benzene is collected on Tenax TA sorbent for 30 s and then detected from the enriched samples with photoacoustic spectroscopy. A high sensitivity is achieved using cantilever-enhanced photoacoustic spectroscopy and a continuous-wave quantum cascade laser emitting at the wavelength 14.8 $μ$m, which corresponds to the absorption wavelength of the strongest benzene infrared band. We reach a detection limit of 150 ppt of benzene, over one sampling cycle. Interference from humidity and other common petrochemicals is evaluated.
