Full Field Visualization of Surface and Bulk Acoustic Waves Using Heterodyne Holographic Interferometry.

摘要

The objective of this research has been to apply optical holographic techniques coupled with electronic signal and image processing to provide quantitative, full field measurements of acoustic wave disturbances. This program has sought to establish the limits of sensitivity with which surface acoustic waves might be measured and mapped. In addition, significant progress has been made toward extending heterodyne holographic measurements to the examination of acoustic energy flow by mapping refractive index changes in optically transparent bulk materials. To date a holographic based optical tomography method has been demonstrated which maps slowly varying changes in refractive index caused by heat flow in a rigid polymer. The extension of this method to permit 3-D mapping of acoustic energy flow was the subject of this final year effort. Keywords: Holography; Ultrasonics; Interferometry. (jhd)