Circuit configuration for inductive displacement measurement

Details Circuit configuration for inductive displacement measurement Circuit configuration for inductive displacement measurement

2004-10-15

2009-02-17

Whittington, Kenneth J (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

Reexamination Certificate

active

07492148

ABSTRACT:
A circuit configuration for inductive displacement measurement using a sensor whose inductance changes as a function of the displacement to be measured, and having an evaluation circuit to which the sensor is connected. The sensor is connected between a first operational amplifier and a series connection of a second operational amplifier and a resistor. The first operational amplifier is switchable over between two specified voltages and the second operational amplifier is operable to adjust a specified constant voltage at the connecting point between the resistor and the sensor, and the output of the second operational amplifier is connected to an input of a comparator whose other input is switchable over between two specified voltages. The output signal of the comparator effecting the switchover of these voltages and the voltages of the first operational amplifier, and is the measuring output signal of the circuit configuration at the same time.

REFERENCES:
patent: 6541961 (2003-04-01), Max
patent: 2003/0098686 (2003-05-01), Mednikov et al.
patent: 2004/0201376 (2004-10-01), Kleine et al.
patent: 102 43 631 (2003-04-01), None
patent: 2 468 884 (1981-05-01), None
patent: 2 062 254 (1981-05-01), None
Translation of International Preliminary Report on Patentability, Aug. 3, 2006, from PCT International Patent Application No. PCT/EP2004/011634, filed Oct. 15, 2004.

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