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Proceedings Paper

Dielectrometers and magnetometers suitable for in-situ inspection of ceramic and metallic coated components
Author(s): Neil J. Goldfine; J. Timothy Lovett; Yanko Sheiretov; Paul J. Zombo
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Paper Abstract

Quasistatic spatial mode (QSM) sensing is a new form of nondestructive evaluation developed to address the increasing need for quantitative materials characterization. Two types of QSM sensors and measurement methods are described: QSM magnetometry and QSM dielectrometry. These measurement methods were invented at the MIT Laboratory for Electromagnetic and Electronic Systems and are being developed at JENTEK Sensors, Inc. for specific applications, such as coating porosity characterization. The sensors discussed here are the meandering winding magnetometer and the inter-digital electrode dielectrometer. These sensors are thin and flexible, permitting inspection of complex and difficult-to-access surfaces. Using continuum electromagnetic models of the sensor field interactions with multiple layered media, repeatable and quantitative measurement of physical and geometric properties are obtained. The specific application addressed here is the characterization of coating and component condition for turbine blades. This includes measurement of thickness and porosity for both ceramic and metallic coatings. Future research will focus on age degradation monitoring as well.

Paper Details

Date Published: 19 June 1995
PDF: 11 pages
Proc. SPIE 2459, Nondestructive Evaluation of Aging Maritime Applications, (19 June 1995); doi: 10.1117/12.212556
Show Author Affiliations
Neil J. Goldfine, JENTEK Sensors, Inc. (United States)
J. Timothy Lovett, JENTEK Sensors, Inc. (United States)
Yanko Sheiretov, JENTEK Sensors, Inc. (United States)
Paul J. Zombo, Westinghouse Electric Corp. (United States)

Published in SPIE Proceedings Vol. 2459:
Nondestructive Evaluation of Aging Maritime Applications
Richard B. Mignogna, Editor(s)

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