Engineering Research Equipment Grant: Scanning Acoustic Microscope

本工程研究设备提案是为 扫描声学显微镜进行广泛的研究， 材料工程，精密机械加工，物理学，考古学， 以及纤维和聚合物科学。 真正的声学显微镜是最近的 现在的发展具有相当于光的分辨率， 显微镜 光和声学的重要区别在于 显微镜是造成图像反差的原因。 光线对比度 显微镜是由于存在和变化的光学 折射率和光吸收系数。 这些 一般来说，基本参数仅与 材料的物理特性;然而，随着声学 在显微镜下，图像内的对比度是由于图像中的 弹性、粘弹性和密度性质。 因此，图像不是 这取决于可见光透射率。 具体问题， 声学显微镜用于：（1）检查 微观弹性和粘弹性模量和密度变化 在通过流动诱导取向生产的超取向纤维中， 高速卷绕;（2）使用 非破坏性的程序，减少吸湿的 环氧树脂/石墨纤维复合材料;（3）表征缺陷 在半导体材料和开发新的图像分析 （4）研究应变过程中的界面， 聚合物基复合材料（这里的新颖效用是由于 复合材料对光不透明，但对超声波仍然透明， （5）协助精密工程中心（新成立） 在这所大学）在表征地下损伤; （6）检查、计数和测量地下结构， 考古标本

This Engineering Research Equipment proposal is for funds for a scanning acoustic microscope to conduct a broad range of studies in materials engineering, precision machining, physics, archaeometry, and fiber and polymer science. True acoustic microscopes are recent developments that now have a resolution equal to that of a light microscope. The important difference between light- and acoustic- microscopy is in the causes of image contrast. Contrast in light microscopy is due to the existence of and variations in optical indices of refraction and coefficients of optical absorption. These basic parameters are, in general, only indirectly related to the material's physical properties; whereas, with the acoustic microscope, contrast within the image is due to variation in the elastic, viscoelastic and density properties. The image is thus not dependent on visible light transmission. Specific problems on which the acoustic microscopy is to be used are: (1) to examine microscopic elastic and viscoelastic moduli and density variations in ultra-oriented fibers produced by flow-induced orientation and high-speed takeup; (2) to examine the interfacial regions using a non-destructive procedure in reducing the moisture absorption of epoxy resin/graphite fiber composites; (3) to characterize defects in semiconductor materials and in developing new image analysis techniques; (4) to investigate the interface during strain in polymer matrix composites (the novel utility here is due to the composites being opaque to light but still transparent to ultra- sound); (5) to assist the Precision Engineering Center (newly formed at this university) in the characterization of subsurface damage; and (6) to examine, count, and measure subsurface structures in archaeological specimens.