Electricity: measuring and testing – Magnetic – Displacement
Patent
1996-04-19
1998-06-02
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Displacement
7351431, 7351438, 73722, 177210EM, 32420722, 32420726, 324234, G01B 714, G01P 1511, G01L 708, G01G 300
Patent
active
057605777
ABSTRACT:
The present invention is a displacement sensor, which is capable of keeping high sensing resolution even if the amount of displacement of the core and the amount of changing the inductance are small. In the displacement sensor of the present invention, a displacing body is capable of displacing according to external force. An LC resonance circuit includes a magnetic coil and a core made of a magnetizable material, which is capable of moving close to and away from the magnetic coil according to the displacement of the displacing body. An oscillator inputs continuous signals having prescribed frequency to the LC resonance circuit. A detecting circuit detects the amount of the displacement of the displacing body on the basis of amplitude of the continuous signals from the LC resonance circuit.
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Kaplan etal; Inductive impedance transducer for recording displacements of ferromagnetic and nonferromagnetic conductive objects, Rev. Sci. Instrum., vol. 49, No. 11, Nov. 1978, pp. 1583-1587.
Strecker Gerard R.
Techno Excel Kabushiki Kaisha
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