Circuit for compensating for time variation of temperature in an inductive sensor
First Claim
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1. An electronic device for sensing at least one parameter, comprising:
- a first circuit element comprising a reactance and a resistance, said first circuit element comprising input terminals and output terminals;
said input terminals for providing a first input signal and a second input signal different from said first signal to said first circuit element;
said output terminals for providing a first output signal and a second output signal from said first circuit element;
a second circuit element connected to said output terminals to use said first output signal and said second output signal, wherein said second circuit element generates a first parameter that depends exclusively on said resistance and a second parameter that depends exclusively on said reactance; and
a third circuit element connected to said second circuit element wherein said third circuit element compensates gain of said second parameter for changes in said first parameter.
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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.
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Citations
25 Claims
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1. An electronic device for sensing at least one parameter, comprising:
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a first circuit element comprising a reactance and a resistance, said first circuit element comprising input terminals and output terminals; said input terminals for providing a first input signal and a second input signal different from said first signal to said first circuit element; said output terminals for providing a first output signal and a second output signal from said first circuit element; a second circuit element connected to said output terminals to use said first output signal and said second output signal, wherein said second circuit element generates a first parameter that depends exclusively on said resistance and a second parameter that depends exclusively on said reactance; and a third circuit element connected to said second circuit element wherein said third circuit element compensates gain of said second parameter for changes in said first parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification