ASCE will be sunsetting the Civil Engineering Database (CEDB) in the coming months. We encourage you to start using the ASCE Library to perform content searches. In the ASCE Library, you can save your search results as well as receive email content alerts when new content relevant to your area of interest is published. Try it out today at https://ascelibrary.org.

 

Laser Interferometric Characterization of Acoustic Emission Transducers

by Douglas A. Bruttomesso, Georgia Inst of Technology, Atlanta, United States,
Laurence J. Jacobs, Georgia Inst of Technology, Atlanta, United States,



Document Type: Proceeding Paper

Part of: Engineering Mechanics

Abstract:

The characterization of the exact response of commercially available, piezoelectric and thin film, acoustic emission transducers is of fundamental importance for the nondestructive evaluation of in-service engineering components. An experimental procedure is developed that uses a laser interferometer to make localized, absolute measurements, with very high fidelity without acoustically loading the specimen. The heterodyne interferometer is operated by splitting a single frequency laser light into two components using an acousto-optic modulator. An important feature of the system is that a linear FM discriminator is used to demodulate the carrier; as a result, the interferometer behaves as a doppler shift detector. An ultrasonic transducer is used to create a repeatable source function on an elastic half-space. The interferometer's response is verified with analytical results, and used to characterize the response of commercially available transducers.

Subject Headings: Acoustics | Material properties | Measuring instruments | Lasers | Nondestructive tests | Emissions | Verification

Services: Buy this book/Buy this article

 

Return to search