Liu Kun, Guo Xiaoyong, Yi Hongming, Chen Weidong, Zhang Weijun, Gao Xiaoming
Environmental Spectroscopy Laboratory, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.
Opt Lett. 2009 May 15;34(10):1594-6. doi: 10.1364/ol.34.001594.
An off-beam (OB) detection approach is suggested and experimentally investigated and optimized for quartz-enhanced photoacoustic spectroscopy (QEPAS). This OB-QEPAS configuration, very simple in assembly, not only allows for use of larger excitation optical beams and facilitating optical alignment but also provides higher enhancement of photoacoustic signals than previously published results based on the common on-beam QEPAS under the same experimental conditions. A normalized noise equivalent absorption coefficient (1sigma) of 5.9 x 10(-9) cm(-1)W/Hz(1/2) was obtained for water vapor detection at normal atmospheric pressure.
本文提出了一种离轴（OB）检测方法，并对其进行了实验研究和优化，用于石英增强光声光谱（QEPAS）。这种OB-QEPAS配置在组装上非常简单，不仅允许使用更大的激发光束并便于光学对准，而且在相同实验条件下，与先前基于普通同轴QEPAS发表的结果相比，能提供更高的光声信号增强。在常压下检测水蒸气时，获得了5.9×10^(-9) cm^(-1)W/Hz^(1/2)的归一化噪声等效吸收系数（1σ）。
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