一种高信噪比的双光束激光光声光谱仪原理及应用

作为一种新兴的检测手段 ,激光光声光谱技术与其他检测技术相比具有很多优点。本文设计的光声光谱仪用激光做光源 ,有两个光声池 ,分别用来放置参考样品和待测样品 ,输出结果为二者光声信号的比值。利用这一比值 ,可以由参考样品的性能参数方便地求出待测样品的相关性能参数。该光声光谱仪有效地减小了本底吸收噪声的影响 ,提高了信噪比 ,扩大了固体光声理论的应用范围。本文还阐述了该光声光谱仪在定性定量分析中的一些应用

Principle and Applications of Double-beam Laser Photoacoustic Spectrometer of High Signal-noise Ratio

As a rising measuring technique, the photoacoustic spectroscopy ( PAS) has many advantages over other classical measuring technology.The doublebeam laser photoacoustic spectrometer presented in this paper has two photoacoustic cells used to contain the test specimen and the reference specimen. The ratio of the two specimens photoacoustic signals is the devices output,And it can be used to study the property of the test specimen . For based on ratio approach, this system decreases the influence of the background noise effectively, increases the signalnoise ratio,and makes PAS can be used more widely. This paper also introduces some applications of this photoacoustic spectrometer.