Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1992-09-28
1995-05-30
Snow, Walter E.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
32420716, 324230, 324655, G01N 2772, G01R 3312, G01R 2700
Patent
active
054205077
ABSTRACT:
An apparatus for sensing a target characteristic, such as relative distance between the apparatus and target, target thickness, target material, or lateral position between the apparatus and the target, includes a coil for directing an electro-magnetic field at the target. A voltage controlled oscillator energizes the coil at a resonant frequency which is functionally related to the target characteristic. The coil has an effective impedance value at resonance functionally related to the target characteristic. A frequency monitor measures the resonant frequency. An impedance monitor determines the impedance value when the drive frequency is at the resonant value. A PROM or controller determines the target characteristic in response to the measured resonant frequency and the determined impedance value. The PROM or controller provides a signal responsive to the determined target characteristic.
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Laskowski Edward L.
Snow Walter E.
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