Interface circuits for electromagnetic position transducers

Details Interface circuits for electromagnetic position transducers Interface circuits for electromagnetic position transducers

G - Physics

01

C

G01C 3/06 (2006.01) G01B 7/00 (2006.01) G01B 7/30 (2006.01) G08C 19/46 (2006.01)

Patent

CA 2048382

Interface circuits for electromagnetic position transducers are provided to reduce the effects of capacitive coupling occurring in the conductive cabling between the position transducers and the associated interfaces located remotely therefrom. Capacitive coupling of excitation signals to the transducer output signals result in error signals appearing as cyclic error in measured positions. The magnitude of the coupled signals are substantially reduced by providing excitation signals symmetrical with respect to ground. The magnitude of the coupled signals are also reduced by presenting equal impedances relative to ground to the output signal return and signal paths. By reducing the effects of capacitively coupled signals, conducting cables for the excitation signals, and the transducer output signals may be incorporated in a single shielded cable.

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