Determination of mechanical properties of layered materials with vector-contrast scanning acoustic microscopy by polar diagram image representation

E. T. Ahmed Mohamed; A. Kamanyi; M. von Buttlar; R. Wannemacher; K. Hillman; W. Ngwa; W. Grill

doi:10.1117/12.776188

16 April 2008 Determination of mechanical properties of layered materials with vector-contrast scanning acoustic microscopy by polar diagram image representation

E. T. Ahmed Mohamed, A. Kamanyi, M. von Buttlar, R. Wannemacher, K. Hillman, W. Ngwa, W. Grill

Author Affiliations +

Proceedings Volume 6935, Health Monitoring of Structural and Biological Systems 2008; 69351Z (2008) https://doi.org/10.1117/12.776188
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2008, San Diego, California, United States

Abstract

Microscopic objects including living cells on a planar substrate are investigated in bio-medical applications of scanning acoustic microscopy. Beside of the observation of lateral structures, the determination of sample properties such as density, sound velocity, and attenuation is desired, from which elastic properties can be derived. This can be achieved with the aid of the acoustic phase and magnitude contrast represented in a polar plot. For homogeneous and sufficiently planar objects the contrast in magnitude and phase is a function of the properties of the substrate and the coupling fluid, which both can easily be determined, and of the mechanical properties of the sample under observation. For observation in reflection and variable thickness of the sample the signal will depend on the actual thickness. This signature of the object can be fitted based on a conventional ray model for the sound propagating in the coupling medium and the sample. The model includes also the refraction and reflection at all interfaces between transducer, lens material, coupling fluid, object, and substrate. The method is demonstrated for a chitosan film deposited on a glass substrate. The scheme presented here is capable to reach a resolution of about and even below 1% for relevant quantities in applications involving imaging at 1.2 GHz in aqueous coupling fluids.

Citation Download Citation

E. T. Ahmed Mohamed, A. Kamanyi, M. von Buttlar, R. Wannemacher, K. Hillman, W. Ngwa, and W. Grill "Determination of mechanical properties of layered materials with vector-contrast scanning acoustic microscopy by polar diagram image representation", Proc. SPIE 6935, Health Monitoring of Structural and Biological Systems 2008, 69351Z (16 April 2008); https://doi.org/10.1117/12.776188

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