Electricity: measuring and testing – Magnetic – Displacement
Patent
1982-01-15
1984-09-04
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Displacement
114144R, 324 67, 324247, 364432, G01B 714, G01R 3302, G01R 1915, B63H 2500
Patent
active
044700130
ABSTRACT:
Device for positioning a moving body in a plane indicated by the axes OX and OY by using a magnetic field. A current i, which is the sum of a current i.sub.o at frequency f.sub.o in which f.sub.o .perspectiveto.100 Hz and a current i.sub.1 at frequency f.sub.1 in which f.sub.1 .perspectiveto.10 kHz modulated by bursts of recurring pulses having a period T.sub.o with T.sub.o =1/f.sub.o flows through a conductor. The moving body carries two pairs of magnetometers supplying the components of the magnetic field h.sub.x.sup.o, h.sub.y.sup.o and h.sub.x.sup.1, h.sub.y.sup.1 with respect to axes associated with the moving body about frequencies f.sub.o and f.sub.1. A subassembly, on the basis of the values of h.sub.x.sup.o and h.sub.y.sup.o, supplies a signal U.sub.1 of frequency 2f.sub.o. A subassembly, on the basis of the signal U.sub.1, supplies two signals S.sub.1 and S.sub.2 displaced by T.sub.o /2. Another subassembly supplies signals T on the basis of the values of h.sub.x.sup.1 and h.sub.y.sup.1, which are compared with the signals S.sub.1 and S.sub.2 for supplying a signal S on the basis of signal U.sub.1. Signal S makes it possible to demodulate the components h.sub.x.sup.o and h.sub.y.sup.o, which are thus obtained with their signs, determining without ambiguity the position of the moving body.
REFERENCES:
patent: 2731598 (1956-01-01), Herbert
patent: 3991363 (1976-11-01), Lathrop
patent: 4075553 (1978-02-01), Bouverot et al.
patent: 4112349 (1978-09-01), Weber
patent: 4118662 (1978-10-01), Weber
patent: 4263552 (1981-04-01), Weber
"Thomson-CSF"
Strecker Gerard R.
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