Data processing: measuring – calibrating – or testing – Measurement system – Dimensional determination
Reexamination Certificate
2007-07-24
2007-07-24
Cosimano, Edward R (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system
Dimensional determination
C324S207110, C324S207160, C324S207170, C324S207180, C702S150000, C702S155000, C702S189000
Reexamination Certificate
active
11341738
ABSTRACT:
An apparatus and method for determining a linear position from a linear variable differential transformer (LVDT) including a primary coil driven by an excitation signal, and two secondary coils coupled to two correlated signals. The method includes converting the correlated signals to a digital estimate, for each of the correlated signals, and evaluating an amplitude of the correlated signals to determine the linear position. The process of converting the correlated signals comprises comparing the correlated signal to an analog feedback signal to generate a comparison result and incrementally adjusting the digital estimate in response to sampling the comparison result at an estimation frequency. The converting process also includes converting the digital estimate to the analog feedback signal, collecting a digital estimate history at a sample frequency that is a binary multiple of the excitation frequency, and analyzing the digital estimate history to determine the amplitude substantially near the excitation frequency.
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Alliant Techsystems Inc.
Cosimano Edward R
TraskBritt
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