Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Reexamination Certificate
2007-10-09
2007-10-09
Cygan, Michael (Department: 2855)
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
C073S774000, C073S762000, C073S763000, C073S788000, C977S917000
Reexamination Certificate
active
11155923
ABSTRACT:
A sensor has a plurality of carbon nanotube (CNT)-based conductors operatively positioned on a substrate. The conductors are arranged side-by-side, such as in a substantially parallel relationship to one another. At least one pair of spaced-apart electrodes is coupled to opposing ends of the conductors. A portion of each of the conductors spanning between each pair of electrodes comprises a plurality of carbon nanotubes arranged end-to-end and substantially aligned along an axis. Because a direct correlation exists between the resistance of a carbon nanotube and its strain, changes experienced by the portion of the structure to which the sensor is coupled induce a corresponding change in the electrical properties of the conductors, thereby enabling detection of crack growth in the structure.
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Ingram JoAnne L.
Kite Marlen T.
Moore Thomas C.
Smits Jan M.
Watkins Anthony N.
Blackburn Linda B.
Cygan Michael
Hammerle Kurt G.
Patel Punam
United States of America as represented by the Administrator of
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