Apparatus for measuring the direction and relative position betw

Details Apparatus for measuring the direction and relative position betw Apparatus for measuring the direction and relative position betw

1974-12-04

1976-11-23

Corcoran, Robert J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

338 32R, G01R 3300

Patent

active

039939464

ABSTRACT:
An improved measurement system for determining the degree of out of synchronism or phase difference of a moving body carrying a row of magnets with respect to a reference signal. A pair of precisely spaced magnetoresistance elements are provided each having a plurality of stripes formed of a ferromagnetic material with an anisotropic characteristic. Each element has an AC power source connected across it, the two power sources being 90.degree. out of phase. Positioned near the magnetoresistance elements is the row of magnets comprised of a plurality of magnet pairs having South pole ends abutting and forming a specific wavelength. As the row of magnets moves relative to the magnetoresistive elements, a changing magnetic flux causes resistance changes in the elements which in turn produces a modulation of the AC power sources which is sensed at the middles of the magnetoresistance elements. These modulated signals are combined to produce a signal whose phase is compared with a reference signal of the same frequency as the AC power sources.

REFERENCES:
patent: 3331045 (1967-07-01), Weiss et al.
patent: 3426270 (1969-02-01), Reid
patent: 3597749 (1971-08-01), Uemura et al.
patent: 3626397 (1971-12-01), Uemura
patent: 3691502 (1972-09-01), Kataoka

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