System and method for detecting cracks and their location

Details System and method for detecting cracks and their location System and method for detecting cracks and their location

2007-06-19

2007-06-19

Noori, Max (Department: 2855)

Measuring and testing

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

By loading of specimen

C073S779000

Reexamination Certificate

active

11229439

ABSTRACT:
A system and method are provided for detecting cracks and their location in a structure. A circuit coupled to a structure has capacitive strain sensors coupled sequentially and in parallel to one another. When excited by a variable magnetic field, the circuit has a resonant frequency that is different for unstained and strained states. In terms of strained states, the resonant frequency is indicative of a region of the circuit that is experiencing strain induced by strain in a region of the structure in proximity to the region of the circuit. An inductor is electrically coupled to one end of each circuit. A magnetic field response recorder wirelessly transmits the variable magnetic field to the inductor and senses the resonant frequency of the circuit so-excited by the variable magnetic field.

REFERENCES:
patent: 3918299 (1975-11-01), Donnadieu
patent: 4579004 (1986-04-01), Kalthoff et al.
patent: 7082833 (2006-08-01), Heyman et al.

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