Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1973-01-11
1976-03-16
Corcoran, Robert J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
307261, 324 8, 340 38L, G01R 3300, G01R 3312
Patent
active
039449122
ABSTRACT:
A device for detecting mobile ferromagnetic masses, notably of vehicles, comprising a magnetometric pick-up element of the type with orthogonal fields. The pick-up element is a ferrite tube of small dimensions which is provided with a toroidal pump winding and a solenoid signal winding. The output of the processing and amplifying device for the signal of the pick-up element is fed back to the solenoid winding via a circuit comprising a low-pass filter and a symmetrical current amplifier. A pulseshaper for the amplified signal supplied by the pick-up element comprises phase-shifting circuits, so that a single squarewave pulse can be obtained upon the passage of a metallic mass.
REFERENCES:
patent: 2406870 (1946-09-01), Vacquier
patent: 2570870 (1951-10-01), Schmitt et al.
patent: 2696602 (1954-12-01), Evans
patent: 2807720 (1957-09-01), Charles
patent: 2938164 (1960-05-01), Hansburg
patent: 3218547 (1965-11-01), Ling
patent: 3458802 (1969-07-01), Koerner
patent: 3649958 (1972-05-01), Koerner
Angel Yves
Mai Van Duc Duc
Corcoran Robert J.
Franzblau Bernard
Trifari Frank R.
U.S. Philips Corporation
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