N. J. Goldfine, A. Washabaugh, D. Grundy, I. Shay, Jentek Sensors, Inc., Waltham, MA; D. Schlicker, JENTEK Sensors, Inc, Waltham, MA

Summary:

Networks of surface mounted and embedded inductive MWM®-Arrays and capacitive IDED®-Arrays have been demonstrated or are under development for monitoring of material condition, damage and usage states. These networks support nondestructive evaluation (NDE) of otherwise difficult-to-inspect areas, health monitoring, and prognostics model validation and implementation. These sensors can be applied to metals, ceramics, composites, rubber, and a wide range of other advanced or traditional materials.

This paper will describe representative sensor constructs and applications for fatigue, corrosion, and coating degradation monitoring. Also, coupon study results and full scale test article results will be described.

Application of such sensor networks for usage monitoring through stress and temperature measurement at otherwise difficult-to-access locations will be discussed. For example, projected magnetic field sensors will be described which monitor the temperature at buried interfaces or on internal or external surfaces with sensors mounted on the opposite side. Similarly, dynamic and static stress measurements at buried interfaces and in non-contact or through wall modes will be described. Multivariate inversion methods for implementation of such solutions will also be presented.