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Tracking the harmonic response of magnetically-soft sensors for wireless temperature, stress, and corrosive monitoringThis paper describes the application of magnetically-soft ribbon-like sensors for measurement of temperature and stress, as well as corrosive monitoring, based upon changes in the amplitudes of the higher-order harmonics generated by the sensors in response to a magnetic interrogation signal. The sensors operate independently of mass loading, and so can be placed or rigidly embedded inside nonmetallic, opaque structures such as concrete or plastic. The passive harmonic-based sensor is remotely monitored through a single coplanar interrogation and detection coil. Effects due to the relative location of the sensor are eliminated by tracking harmonic amplitude ratios, thereby, enabling wide area monitoring. The wireless, passive, mass loading independent nature of the described sensor platform makes it ideally suited for long-term structural monitoring applications, such as measurement of temperature and stress inside concrete structures. A theoretical model is presented to explain the origin and behavior of the higher-order harmonics in response to temperature and stress. c2002 Elsevier Science B.V. All rights reserved.
Document ID
20040087964
Document Type
Reprint (Version printed in journal)
Authors
Ong, Keat G. (University Park PA 16802, United States)
Grimes, Craig A.
Date Acquired
August 21, 2013
Publication Date
September 30, 2002
Publication Information
Publication: Sensors and actuators. A, Physical
Volume: 101
Issue: 2-Jan
ISSN: 0924-4247
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NAG1-01036
Distribution Limits
Public
Copyright
Other
Keywords
Non-NASA Center
NASA Discipline Life Sciences Technologies