Location

La Jolla, CA

Start Date

1-1-1983 12:00 AM

Description

The imaging of interior planes in a solid object involves difficulties with spherical aberration, with the elimination of the front surface echo, and with the need in some cases to use signal processing techniques in order to enhance the signal-to-noise ratio. This paper shows that suitably designed spherical lenses can be used to minimize the spherical aberration. The elimination of the front surface echo requires careful time-gating and very short, broadband pulses. It is shown by using extended chirp pulses, the signal-to-noise ratio for subsurface objects can be very greatly improved. A number of examples of the use of these techniques for NDE are presented.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

2B

Chapter

Section 23: Acoustic Imaging

Pages

1611-1623

DOI

10.1007/978-1-4613-3706-5_107

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Subsurface Broadband Acoustic Microscopy of Solids using Aperture Lenses

La Jolla, CA

The imaging of interior planes in a solid object involves difficulties with spherical aberration, with the elimination of the front surface echo, and with the need in some cases to use signal processing techniques in order to enhance the signal-to-noise ratio. This paper shows that suitably designed spherical lenses can be used to minimize the spherical aberration. The elimination of the front surface echo requires careful time-gating and very short, broadband pulses. It is shown by using extended chirp pulses, the signal-to-noise ratio for subsurface objects can be very greatly improved. A number of examples of the use of these techniques for NDE are presented.