System, method, and apparatus for wireless non-powered...

Details System, method, and apparatus for wireless non-powered... System, method, and apparatus for wireless non-powered...

2008-05-27

2008-05-27

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

Specified electrical sensor or system

C073S787000, C702S034000, C324S209000

Reexamination Certificate

active

11273460

ABSTRACT:
A wireless, non-powered fatigue monitoring sensor uses a piezoelectric element that is attached to the surface of or embedded within a structure to be monitored. When subjected to stress over time, the material properties of the element change reliably and permanently. These properties are used to determine the fatigue history of the structure. The monitoring device requires no power for monitoring and is nondestructively queried to determine the stress history using wireless means such as radio frequency technology.

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