Mr. Mauricio Gomes Duarte Profile

Mauricio Gomes Duarte

at Univ of Campinas

SPIE Involvement:

Author

Publications (1)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 23 May 2003 Paper

Apodization process of piezoelectric ceramics for ultrasound transducers

Mauricio Duarte, Vera Nantes Button, Joaquim Maia, Eduardo Costa, Eduardo Oliveira

Proceedings Volume 5035, (2003) https://doi.org/10.1117/12.479921

KEYWORDS: Ceramics, Apodization, Transducers, Ultrasonography, Electrodes, Acoustics, Spherical lenses, Diffraction, Minerals, Oscilloscopes

Read Abstract +

The objective of this work was to optimize the process of apodization of piezoelectric ceramic discs, looking for the better relationship between oil bath temperature and time of electrical field application. The apodization was performed to reduce the diffraction in the acoustic field generated by ultrasonic transducers. We used 12.7mm diameter and 1mm thickness PZT-5A discs. The apodization field (2kV/mm thickness) has been shaped by a 5mm radius spherical electrode throughout the apodization processes we have used. The apodized ceramic discs which showed electromechanical coupling coefficient value, for the thickness mode of vibration, equal or larger than 0.37, were considered well apodized. We used initial oil bath temperatures from 120°C to 250°C and the electric field was applied for periods of at least 2 minutes to up to 4 hours. The results showed that if the poling electric field was applied to the piezoelectric ceramic even before the oil was heated, we obtained larger piezoelectric coupling coefficients; in higher temperatures (250°C) this was not necessary. We concluded that using higher temperatures (250°C) it was possible to reduce the apodization process, with satisfactory results, from 4-5 hours to 2 minutes. Ultrasound transducers were built with apodized ceramics and their acoustic fields showed larger depth of field relative to non apodized ones.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

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

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years