Optics: measuring and testing – By light interference – For dimensional measurement
Reexamination Certificate
2007-04-24
2007-04-24
Toatley, Jr., Gregory J. (Department: 2877)
Optics: measuring and testing
By light interference
For dimensional measurement
C073S037500, C073S763000, C073S866000
Reexamination Certificate
active
10914777
ABSTRACT:
A specialized containment cell with optically transparent apertures, in conjunction with a laser interferometer system provides the means for non-contact displacement measurements of electro-active (piezoelectric and electrostrictive) materials to be performed under controlled conditions of pressure, temperature and applied voltage. A sample of electro-active material is placed inside the cell. Electrical connections are made from a high voltage power source to the sample through the cell. Thermoelectric heaters/coolers and a cooling water heat sink built into the cell control the temperature of the sample. The cell is flooded with a dielectric oil pressurizing the interior of the cell to a desired pressure. The cell is optically aligned to the interferometer, and with the cell heated to the proper temperature, a voltage is applied to the sample as the interferometer measures the displacement of the sample.
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Carreiro Louis G.
Reinhart Lawrence J.
Connolly Patrick
Kasischke James M.
Nasser Jean-Paul A.
Stanley Michael P.
The United States of America as represented by the Secretary of
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