Thermal measuring and testing – Thermal testing of a nonthermal quantity – Expansion or contraction characteristics
Reexamination Certificate
2006-05-30
2006-05-30
Gutierrez, Diego (Department: 2859)
Thermal measuring and testing
Thermal testing of a nonthermal quantity
Expansion or contraction characteristics
C374S005000, C374S007000, C374S057000, C374S142000, C073S766000, C073S803000
Reexamination Certificate
active
07052174
ABSTRACT:
An apparatus for non-destructively testing the response of a specimen to temperature change. An embodiment temperature cycles a specimen, such as a wet mortar beam, dynamically measuring change in dimension and the temperature of the specimen during the cycle. Among other elements, the apparatus employs an accelerometer, a thermistor, a thermocouple, a temperature controller, linear variable differential transducers (LVDTs), an FFT device, a data logger and a heat tape controller. A typical cycle involves using liquid nitrogen to reduce the temperature in an insulated test chamber from ambient to less than −60° C. and returning to ambient by dispersing the nitrogen with a source of ambient air. Further, in select embodiments, the apparatus measures fundamental frequencies induced by a micro-hammer as measured transversely along a dimension of a specimen during the cooling-warming cycle. Also provided is a method for testing specimens using devices representative of embodiments of the present invention.
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Baugher Jr. Earl H.
Gutierrez Diego
The United States of America as represented by the Secretary of
Vaughn Megann E.
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