Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specified electrical sensor or system
Reexamination Certificate
2011-04-19
2011-04-19
Caputo, Lisa M (Department: 2855)
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specified electrical sensor or system
C073S767000
Reexamination Certificate
active
07926356
ABSTRACT:
An invented apparatus for nondestructively remotely measuring the health of an energetic material, includes a piezoelectric capacitance sensor having an exterior surface that is substantially inert to the energetic material. The piezoelectric capacitance sensor provides an analog signal that is commensurately responsive to the modulus of material in intimate contact with the sensor. The apparatus also includes an interrogator for interrogating the sensor as to a capacitance of the piezoelectric capacitance sensor. The interrogator converts the analog signal of the capacitance into a digital representation. The apparatus further includes a means of communicating the digital representation to a remote communication device.
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“Sensitivity of piezo wafers to the curing of thermoset resins and thermoset composites”, Xiaoming Wang et al., Smart Materials and Structures 7 p. 113 (1998).
Caputo Lisa M
Roy Punam
The United States of America as represented by the Secretary of
Zimmerman Fredric J.
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