Non-inertial ultra-wideband acoustic transducers

U. Amjad; K. Hahn; T. G. Tang; W. Grill

doi:10.1117/12.815481

9 April 2009 Non-inertial ultra-wideband acoustic transducers

U. Amjad, K. Hahn, T. G. Tang, W. Grill

Proceedings Volume 7295, Health Monitoring of Structural and Biological Systems 2009; 72951U (2009) https://doi.org/10.1117/12.815481
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2009, San Diego, California, United States

Abstract

In introductory and even some advanced textbooks covering ultrasonic transducers including piezoelectric discs, the transducers used for excitation are normally introduced as electrically driven mechanical oscillators operated reversely for detection. A refined treatment based on original work from the early 60's of the last century demonstrates that even in this simple case, electromagnetic-mechanical coupling is restricted to interfaces with the volume of transducer discs operating in part as inertial mass, which can also be provided by suitable backing with improved results. Geometrical effects in combination with the oscillating masses lead to resonances of the transducers limiting the applications. Thin transducer discs or film transducers, which are in comparison to the oscillating masses in the generated or detected acoustic waves approximately mass free, can be operated such that inertial effects in the transducer are reduced respectively almost avoided. Even though such transducers are available on a commercial basis and are well introduced for the generation and detection of Lamb waves, the basic underlying principles are usually not highlighted. These effects are experimentally demonstrated and compared to expectations based on basic principles. Schemes suitable to overcome bandwidth restrictions given by geometrical effects are discussed and an application of wideband transducers for Lamb waves used for stress detection is exemplified.

Citation Download Citation

U. Amjad, K. Hahn, T. G. Tang, and W. Grill "Non-inertial ultra-wideband acoustic transducers", Proc. SPIE 7295, Health Monitoring of Structural and Biological Systems 2009, 72951U (9 April 2009); https://doi.org/10.1117/12.815481

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available