Circuit for compensating for time variation of temperature in an inductive sensor
First Claim
1. An electronic device, comprising a sensor sensitive to position of a conductive or ferrous material, said sensor comprising a single coil inductance transducer, a temperature measurement circuit for providing a temperature output derived from said sensor, a position measuring circuit for measuring position of said conductive or ferrous material, and a voltage controlled gain adjusting device, wherein said temperature measurement circuit provides a voltage proportional to temperature to said voltage controlled gain adjusting device to adjust output voltage of said position measuring circuit to provide temperature compensated sensor data, wherein said temperature measurement circuit uses a signal derived from resistance of said single coil inductance transducer to provide said voltage proportional to temperature.
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Accused Products
Abstract
A sensing device includes a circuit that compensates for time and spatial changes in temperature. The circuit includes elements to correct for variation in permeability of a highly permeable core of a differential variable reluctance transducer as temperature changes. The circuit also provides correction for temperature gradients across coils of the transducer.
41 Citations
53 Claims
- 1. An electronic device, comprising a sensor sensitive to position of a conductive or ferrous material, said sensor comprising a single coil inductance transducer, a temperature measurement circuit for providing a temperature output derived from said sensor, a position measuring circuit for measuring position of said conductive or ferrous material, and a voltage controlled gain adjusting device, wherein said temperature measurement circuit provides a voltage proportional to temperature to said voltage controlled gain adjusting device to adjust output voltage of said position measuring circuit to provide temperature compensated sensor data, wherein said temperature measurement circuit uses a signal derived from resistance of said single coil inductance transducer to provide said voltage proportional to temperature.
- 17. An electronic device, comprising a single coil inductance transducer having a single coil and a magnetically permeable member that extends in said single coil, said device further comprising a temperature measurement circuit, a position measuring circuit, and a voltage controlled gain adjusting device, wherein said temperature measurement circuit provides a voltage proportional to temperature to said voltage controlled gain adjusting device to adjust output voltage of said position measuring circuit to compensate for a change in temperature in said single coil and in said member.
- 28. An electronic deuce, comprising a single inductor, a conductive or magnetically permeable member coupled to said single inductor, a temperature measurement circuit, an inductance measuring circuit, and a voltage controlled gain adjusting device, wherein said temperature measurement circuit provides a voltage proportional to temperature to said voltage controlled gain adjusting device to adjust output voltage of said inductance measuring circuit to provide an adjusted output voltage independent of temperature of said single inductor and temperature of said conductive or magnetically permeable member.
- 40. A device comprising a single component, a temperature measurement circuit, a first parameter measuring circuit for measuring a value of said single component, and a voltage controlled gain adjusting device, wherein said temperature measurement circuit provides a voltage proportional to temperature to said voltage controlled gain adjusting device to adjust output voltage of said first parameter measuring circuit to make adjusted output voltage of said first parameter measuring circuit independent of change in temperature with time.
Specification