The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 02, 1986
Filed:
Apr. 13, 1983
Wilbur F Metcalf, Sarasota, FL (US);
Electro Corporation, Sarasota, FL (US);
Abstract
A magnetic sensor for detecting the leading edge of a ferrous target as it passes the centerline of the sensor. The magnetic sensor includes a coil output representing the rate of change of magnetic flux as the target passes the sensor. The coil output is differentiated to provide a signal having a zero crossover point corresponding to the time at which the leading edge of the target passes the centerline of the sensor. The differentiated signal is applied to a zero crossover threshold detector to provide a first pulse, the trailing edge of which corresponds to the time at which the target's leading edge is coincident with the sensor centerline. Additional means provide a second pulse whose leading edge corresponds to the time at which the leading edge of the target is coincident with the centerline of the sensor.