Cart (Loading....) | Create Account
Close category search window
 

A Resonant Microwave Patch Sensor for Detection of Layer Thickness or Permittivity Variations in Multilayered Dielectric Structures

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Yang Li ; Dept. of Electr. & Comput. Eng., Iowa State Univ., Ames, IA, USA ; Bowler, N. ; Johnson, D.B.

A microwave nondestructive evaluation (NDE) sensor operating in the X-band (8.2 to 12.4 GHz) for detecting thickness or permittivity changes in one layer of multilayered dielectric structures is presented. In particular, detection of defects in the form of permittivity variations in the core layer of a three-layer structure, such as an aircraft radome, is targeted. Using an efficient analytical model for calculating the resonant frequency of a rectangular patch sensor covered with multilayered dielectric structures, the effects of varying the geometric and electrical parameters of the sensor on its performance are analyzed. According to this analysis and other empirical design equations, a resonant patch sensor was designed for good sensitivity to core permittivity changes, adequate penetration depth and spatial resolution. Experimental results showed that one particular sensor is capable of detecting a relative permittivity change as small as Δε = 0.046, can achieve spatial resolution 5 mm, and can inspect permittivity changes to depth 4.35 mm in the core of a three-layer dielectric structure. Measurements on a fiberglass-honeycomb-fiberglass structure containing injected water showed that 0.25 cc (one honeycomb cell) of water can be detected by this sensor.

Published in:

Sensors Journal, IEEE  (Volume:11 ,  Issue: 1 )

Date of Publication:

Jan. 2011

Need Help?


IEEE Advancing Technology for Humanity About IEEE Xplore | Contact | Help | Terms of Use | Nondiscrimination Policy | Site Map | Privacy & Opting Out of Cookies

A not-for-profit organization, IEEE is the world's largest professional association for the advancement of technology.
© Copyright 2014 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.