Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1997-04-28
1999-06-29
Snow, Walter E.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
3242072, G01P 348, G01P 3489, G01B 714
Patent
active
059173203
ABSTRACT:
A method for detection of passing magnetic articles which includes an initial step of sensing an ambient magnetic field and generating a voltage, Vsig, proportional to the magnetic field. A threshold voltage is generated as a percentage of the peak-to-peak voltage of Vsig. The method further includes the step of generating a proximity detector output voltage that becomes one binary level when Vsig rises to exceed the threshold voltage and another binary level when Vsig falls to below the threshold voltage. The threshold voltage is periodically updated to remain the percentage, within a predetermined tolerance, of the peak-to-peak voltage of Vsig in response to changes that may occur in the peak voltages of Vsig. In one embodiment, the threshold voltage is at a first level corresponding to a first percentage of the peak-to-peak voltage of Vsig when Vsig exceeds the threshold voltage and is at a second level corresponding to a second percentage of the peak-to-peak voltage of Vsig when Vsig is less than the threshold voltage.
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Scheller P. Karl
Towne Jay M.
Vig Ravi
Yabusaki Hitoshi
Allegro Microsystems Inc.
Crowley Judith C.
Snow Walter E.
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