Dielectrometers and magnetometers suitable for in-situ inspection of ceramic and metallic coated components

Neil J. Goldfine; J. Timothy Lovett; Yanko Sheiretov; Paul J. Zombo

doi:10.1117/12.212556

19 June 1995 Dielectrometers and magnetometers suitable for in-situ inspection of ceramic and metallic coated components

Neil J. Goldfine, J. Timothy Lovett, Yanko Sheiretov, Paul J. Zombo

Author Affiliations +

Proceedings Volume 2459, Nondestructive Evaluation of Aging Maritime Applications; (1995) https://doi.org/10.1117/12.212556
Event: Nondestructive Evaluation of Aging Infrastructure, 1995, Oakland, CA, United States

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.

Citation Download Citation

Neil J. Goldfine, J. Timothy Lovett, Yanko Sheiretov, and Paul J. Zombo "Dielectrometers and magnetometers suitable for in-situ inspection of ceramic and metallic coated components", Proc. SPIE 2459, Nondestructive Evaluation of Aging Maritime Applications, (19 June 1995); https://doi.org/10.1117/12.212556

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