光声技术测量液体吸收系数的数据仿真及实验验证

Measuring Optical Absorption Coefficient by Using Pulsed Photoacoustic Method

提出了用脉冲光声技术测量样品吸收系数的方法.首先假设光在某些样品中传播其强度是沿一指数曲线衰减.则探测器探测到的光声信号可看作是指数衰减曲线与探测器脉冲响应卷积的结果,通过衰减系数的值反映出光吸收系数的大小.用数据仿真及实验验证的方法对文中提出的理论做了论证,所获得的结果与用其他方法所获得的测量结果有一定的吻合性,这为光声技术的无损检测提供了一种参考方法.

This paper describes a new approach to recover an absolute optical absorption coefficient from measured photoacoustic signals based on an exact solution of the wave equation.Photoacoustic signal is detected by a detector can be seen as the convolution results by an exponential decay curve and the pulse response of detector,then attenuation coefficient index reflects the light absorption coefficient.The results obtained are consistent with the results obtained by the other methods.This provides a reference method for nondestructive detection of photoacoustic technique.