Tuning fork enhanced interferometric photoacoustic spectroscopy: a new method for trace gas analysis
Tuning fork enhanced interferometric photoacoustic spectroscopy: a new method for trace gas analysis
复制标题
DOI：
10.1007/s00340-010-4222-4
复制
发表时间：
2011-01-01
影响因子：
2.1
通讯作者：
Schade, W.
中科院分区：
文献类型：
--
作者：
Koehring, M.;Pohlkoetter, A.;Schade, W.
介绍了一种基于石英音叉光读出法的光声痕量气体传感器。本文提出了一种利用干涉仪读出音叉振动信号的方法，取代了传统的石英增强光声光谱（QEPAS）中的压电信号读出方法。为了证明光声中音叉的光学读出的潜力，报道了具有干涉读出的传感器和具有压电读出的常规QEPAS的性能之间的比较。这两种传感器显示出相似的特性。光学读出的检测极限（L）被确定为L（opt）=（2598 +/- 84）ppm（1 sigma），相比之下压电读出的L（opt）=（2579 +/- 78）ppm（1 sigma）。在这两种情况下，检测极限由音叉的热噪声定义。
A photoacoustic trace gas sensor based on an optical read-out method of a quartz tuning fork is shown. Instead of conventional piezoelectric signal read-out, as applied in well-known quartz-enhanced photoacoustic spectroscopy (QEPAS), an interferometric read-out method for measurement of the tuning fork's oscillation is presented. To demonstrate the potential of the optical read-out of tuning forks in photoacoustics, a comparison between the performances of a sensor with interferometric read-out and conventional QEPAS with piezoelectric read-out is reported. The two sensors show similar characteristics. The detection limit (L) for the optical read-out is determined to be L (opt)=(2598 +/- 84) ppm (1 sigma) compared to L (elec)=(2579 +/- 78) ppm (1 sigma) for piezoelectric read-out. In both cases the detection limit is defined by the thermal noise of the tuning fork.