Presenter Information

K. E. Lulay, Boeing

Location

Seattle, WA

Start Date

1-1-1996 12:00 AM

Description

To interrogate the internal structure of a part using conventional ultrasonic testing, pulsed elastic waves are induced in the part and reflect off internal discontinuities. The amplitude and time of flight of the reflected wave provide information about the discontinuity. There is a direct correlation between the location of a reflection and the round trip time. Reflections emanating from deep in the part require more time to return to the ultrasonic probe than do shallow reflections. This makes possible the use of time based “windows” or “gates” to acquire data corresponding to a specific depth of interest. Although complex and expensive electronic circuitry is required, under most circumstances time based data acquisition works well. However, there are occasions in ultrasonic testing where time based data acquisition is inadequate and where true spatial resolution is desired.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

15B

Chapter

Chapter 8: Systems, New Techniques and Process Control

Section

New Techniques

Pages

2023-2029

DOI

10.1007/978-1-4613-0383-1_265

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Development of an Apertured-Confocal Acoustic Microscope

Seattle, WA

To interrogate the internal structure of a part using conventional ultrasonic testing, pulsed elastic waves are induced in the part and reflect off internal discontinuities. The amplitude and time of flight of the reflected wave provide information about the discontinuity. There is a direct correlation between the location of a reflection and the round trip time. Reflections emanating from deep in the part require more time to return to the ultrasonic probe than do shallow reflections. This makes possible the use of time based “windows” or “gates” to acquire data corresponding to a specific depth of interest. Although complex and expensive electronic circuitry is required, under most circumstances time based data acquisition works well. However, there are occasions in ultrasonic testing where time based data acquisition is inadequate and where true spatial resolution is desired.