System for ascertaining magnetic field direction

Details System for ascertaining magnetic field direction System for ascertaining magnetic field direction

1979-04-30

1981-05-19

Martin, Jr., William D.

Geometrical instruments

Indicator of direction of force traversing natural media

Magnetic field responsive

324260, G01C 1730

Patent

active

042676401

ABSTRACT:
A system for detecting magnetic field direction comprising a pair of orthogonally positioned rods each having a rectangular shaped BH curve, a switching winding, and detectors for detecting the switching of magnetic polarity of each rod to either of its remanent states. A switching current having a triangularly shaped waveform is supplied through said switching windings to drive said rods between their remanent states at times depending upon their angular relationship with the external magnetic field. Counters record the difference in time, measured from the immediately preceding zero current crossover points between the switching of each rod first to one of its remanent states and then to the other of said states. The time difference in one rod is proportional to the sine of the angle between the external field and said one rod and to the cosine of the angle between the external field and the other said other rod. The arc tangent of the ratio of the sine function to the cosine function is the angular relation of the external field to the rods.

REFERENCES:
patent: 3133244 (1964-05-01), Wojtulewicz
patent: 3573610 (1971-04-01), Kesselring
patent: 3601899 (1971-08-01), Artz
patent: 3678593 (1972-07-01), Baker et al.
patent: 3881258 (1975-05-01), Iddings
patent: 3936949 (1976-02-01), Devand
patent: 3952420 (1976-04-01), Benjamin et al.
patent: 3959889 (1976-06-01), Thomas
patent: 3971981 (1976-07-01), Nakagome et al.
patent: 4030204 (1977-06-01), Edwards

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