Developing of Scanning Photoacoustic Microscope

研制了一种由低价格部件组成的扫描光声显微镜（SPAM）的硬件和软件。我们发现我们的SPAM可以很好地用于了解可加工陶瓷表面缺陷的基本特征，环氧树脂表面和表面下缺陷以及碳纤维在CFRP中作为无损检测设备的分布。用这种SPAM测量了不同背衬（铝、白色丙烯酸树脂和涂黑的白色丙烯酸树脂）上的环氧树脂产生的光声信号的振幅和相位。实验结果如下：光反射衬底的光声信号由衬底上的环氧树脂产生，而光吸收衬底的光声信号由衬底本身产生。我们提出了一种环氧树脂样品中钻孔的“PA成像模型”。

We developed the hardware and software of scanning photoacoustic microscope(SPAM) composed of low price parts. We found that our SPAM could be used well to understand fundamental characteristics of a surface flaw on machinable ceramic, surface and subsurface flaws in epoxy and the distribution of carbon fiber in the CFRP as an equipment of nondestructive testing.Amplitude and phase of a photoacoustic signal generated from an epoxy resin on various backings(aluminum, white acrylic resin and black-coated white acrylic resin) were measured by this SPAM.The experimental results were as follows.The photoacoustic signals for light-reflective backings were generated from the epoxy resin on the backing, while photoacoustic signals for light-absorptive backing were generated from the backing itself. We proposed a "model for PA imaging of" a drilled hole in the epoxy resin sample.