Location

La Jolla, CA

Start Date

1-1-1987 12:00 AM

Description

We have built a low-frequency scanning acoustic microscope (SAM) that measures both amplitude and phase. The majority of SAMs simply measure the amplitude of the reflected signal. Measuring the phase gives a great deal more information. For one thing, the phase is very sensitive to height variations. Measuring the phase also gives us the ability to do signal processing on the resulting images, such as removing the effects of surface features from defocused images of subsurface defects.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

6A

Chapter

Chapter 2: Imaging, Microscopy, Inversion and Reconstruction

Section

Imaging and Microscopy

Pages

543-551

DOI

10.1007/978-1-4613-1893-4_62

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Acoustic Microscopy Using Amplitude and Phase Measurements

La Jolla, CA

We have built a low-frequency scanning acoustic microscope (SAM) that measures both amplitude and phase. The majority of SAMs simply measure the amplitude of the reflected signal. Measuring the phase gives a great deal more information. For one thing, the phase is very sensitive to height variations. Measuring the phase also gives us the ability to do signal processing on the resulting images, such as removing the effects of surface features from defocused images of subsurface defects.