导数光声光谱技术

Differential Photoacoustic Spectroscopy

本文报道了一种新的光声光谱技术即导数光声光谱技术 ,它利用一台单色仪和一个波长分束器 ,同时获得两束光强相同但波长有微小差别的两束光 ,这两束光分别入射到两个光声传感器 ,光声传感器的输出信号输送到锁相放大器并实现差分输出 ,输出信号输送到 X - Y记录仪进行记录 ,最后扫描单色仪的波长从而获得导数光声光谱 ,这种光谱技术既具有光声光谱技术灵敏度高的优点 。

A new photoacustic spectroscopy technique,called differential photoacoustic spectroscopy is presented in this paper.Using a monochromator and a wavelength beam split,two light beams with identical intensity but different in wavelength are obtained at the same time.This two light beams are focal in two photoacoustic detectors respectively and the output of each detectors is transmitted to a lock in amplifier.Then the output (A B) of the lock in amplifier is transmitted to a X Y recorder.Finally the differential photoacoustic spectroscopy is obtained by scanning the wavelength of monochromator.This differential photoacoustic spectroscopy has both the advantages of photoacoustic spectroscopy with high sensitivity and differential spectroscopy with high resolution.