利用计算全息技术重构激光超声的激发面源

把计算全息技术引入激光超声无损检测系统,此系统借助直接搜索算法生成计算全息图,利用空间光调制器液晶器件代替传统全息干板再现全息图像,并将此生成、再现方法具体用于空间调制的脉冲激光源的产生,以辅助固体表面的窄带超声波的激发。由于算法的稳健性和重建方法灵活性,大大简化了激光超声实验系统,缩短了实验周期,在激光超声无损检测领域有广泛的应用空间。

Pump Source Reconstruction of Laser Ultrasonic by Computer Generated Holography

The technique of computer-generated holography (CGH) is introduced into the experimental system on laser ultrasonic non-destructive evaluation (NDE). This system employs a direct-search algorithm to generate the hologram and further reconstructs the hologram via aliquid crystal spatial light modulator. Specifically, a generation and reconstruction method is applied to help the spatial modulation of the laser pulse to excite narrow-band ultrasound. Due to the robusticity of the algorithm and the flexibility of the reconstruction method, this method can simplify the laser ultrasonic setup and substantially shorten the experiment period. Thus there will be a variety of applications for this system in the fields of NDE.