Location

La Jolla ,CA

Start Date

1-1-1989 12:00 AM

Description

Previous studies1 have described a scanning heterodyne microinterferometer which produced contour plots from parameters derived from ultrasonic time domain waveform measurements. These plots were able to resolve ultrasonic displacements on the order of angstroms perpendicular to the plane of the specimen. Spatial resolution comparable to the wavelength of the ultrasonic pulses being detected was obtainable in the plane of the specimen. This level of resolution was adequate to provide details of wave propagation phenomena near large fibers (diameters greater than one tenth of a millimeter) or within groups of similar plies in a laminated composite.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

8A

Chapter

Chapter 2: Advanced Techniques

Section

Laser Ultrasonics

Pages

521-526

DOI

10.1007/978-1-4613-0817-1_65

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

An Image Scanning Heterodyne Microinterferometer

La Jolla ,CA

Previous studies1 have described a scanning heterodyne microinterferometer which produced contour plots from parameters derived from ultrasonic time domain waveform measurements. These plots were able to resolve ultrasonic displacements on the order of angstroms perpendicular to the plane of the specimen. Spatial resolution comparable to the wavelength of the ultrasonic pulses being detected was obtainable in the plane of the specimen. This level of resolution was adequate to provide details of wave propagation phenomena near large fibers (diameters greater than one tenth of a millimeter) or within groups of similar plies in a laminated composite.