液体的脉冲差分光声喇曼光谱

Pulsed differential PARS of liquid

采用脉冲光声方法测量了各种有机和无机液体的受激喇曼光谱,探讨了影响这种光谱技术灵敏度的主要原因,即来自线性吸收信号的干扰,并进一步采用一种改进的方法——差分方法,消除了线性光声信号的影响,可以测量到比较弱的喇曼谱线以及浓度比较低的物质的喇曼光谱,并探讨了这种技术在痕量物质测量以及探测环境污染物质等领域中的应用前景.

Nonlinear Raman spectrum of various of liquids is detected by using pulsed photoacoustic method. The cause of limiting the detect sensitivity of PARS techenique, mainly due to linear absorption, is discussed. Furthermore, an improvement method, differential method, is used to elimnate the disturbance from linear absorption. The detect sensitivity of PARS techenique is increased, so that the Raman spectrum of low concentration matter and the weakline of Raman spectrum can be detected. The probability of using differential PARS techenique to detect contaminant is discussed.