Electricity: measuring and testing – Magnetic – Displacement
Patent
1991-02-22
1993-03-30
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Displacement
324202, 32420716, 324234, 324236, 324654, 331 65, G01B 714, G01R 3312, G01N 2772, G01V 310
Patent
active
051987643
ABSTRACT:
A position detection method and apparatus is disclosed which utilizes an electromagnetic probe as the control element in a relaxation oscillator circuit. The probe is energized by a pulse voltage waveform and the decay time of the induced transient probe voltage is utilized to modulate the frequency of the pulse generator. The probe transient voltage decay time is influenced by the proximity of an electrically conductive or magnetic object. Therefore, a frequency output is generated which indicates the position of the conductive or magnetic object.
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Sentech Corp.
Strecker Gerard R.
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