Electricity: measuring and testing – Magnetic – Calibration
Reexamination Certificate
2005-01-18
2005-01-18
Gutierrez, Diego (Department: 2859)
Electricity: measuring and testing
Magnetic
Calibration
C374S142000, C374S149000, C374S152000, C374S179000, C374S056000, C033S702000, C073S001790
Reexamination Certificate
active
06844720
ABSTRACT:
A calibration apparatus for calibrating a linear variable differential transformer (LVDT) having an armature positioned in au LVDT armature orifice, and the armature able to move along an axis of movement. The calibration apparatus includes a heating mechanism with an internal chamber, a temperature measuring mechanism for measuring the temperature of the LVDT, a fixture mechanism with an internal chamber for at least partially accepting the LVDT and for securing the LVDT within the heating mechanism internal chamber, a moving mechanism for moving the armature, a position measurement mechanism for measuring the position of the armature, and an output voltage measurement mechanism. A method for calibrating an LVDT, including the steps of: powering the LVDT; heating the LVDT to a desired temperature; measuring the position of the armature with respect to the armature orifice; and measuring the output voltage of the LVDT.
REFERENCES:
patent: 3919879 (1975-11-01), Betz
patent: 5689447 (1997-11-01), Ward
patent: 5767670 (1998-06-01), Maher et al.
patent: 5789918 (1998-08-01), Imai et al.
Gottlieb Paul A.
Gutierrez Diego
Moody Julia Cook
Pruchnic Jr. Stanley J.
The United States of America as represented by the United States
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