Location

La Jolla ,CA

Start Date

1-1-1989 12:00 AM

Description

An eight-channel, data-acquisition system is used to acquire and analyze acoustic-emission [AE] data from aluminum surface-crack specimens. The system is calibrated using known source locations and laser-generated ultrasound to determine the transducer locations by finding the arrival time of the longitudinal wave and then doing a nonlinear, least-squares fit. From these transducer locations, the origin of AE sources can be determined using a similar procedure. Automated methods for determining source location by finding the first signal above noise on each channel and identifying this signal as the longitudinal wave arrival are developed for processing the vast amount of data generated during a typical experiment. The application of these methods to data acquired during tensile testing is discussed.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

8A

Chapter

Chapter 5: Systems and Instrumentation

Pages

1153-1159

DOI

10.1007/978-1-4613-0817-1_145

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Applications of a Digital Acoustic-Emission Data-Acquisition Workstation

La Jolla ,CA

An eight-channel, data-acquisition system is used to acquire and analyze acoustic-emission [AE] data from aluminum surface-crack specimens. The system is calibrated using known source locations and laser-generated ultrasound to determine the transducer locations by finding the arrival time of the longitudinal wave and then doing a nonlinear, least-squares fit. From these transducer locations, the origin of AE sources can be determined using a similar procedure. Automated methods for determining source location by finding the first signal above noise on each channel and identifying this signal as the longitudinal wave arrival are developed for processing the vast amount of data generated during a typical experiment. The application of these methods to data acquired during tensile testing is discussed.