Digital rod position detector system

Details Digital rod position detector system Digital rod position detector system

1984-10-03

1986-12-16

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Displacement

376258, 34087031, G01B 714

Patent

active

046299831

ABSTRACT:
Coils placed at spaced locations along the path of an axially movable magnetically permeable and/or electrically conductive rod, which changes the impedance of each coil as it passes through, are connected in sets with each set comprising two series connected groups of equal numbers of parallel connected, non-adjacent coils energized by an a-c source. The voltage at the common node of each set of coils, which fluctuates as equal and unequal numbers of coils in the two groups in a given set are penetrated by the end of the rod, is compared with the voltage at the common node of a pair of series connected resistors, also energized by the a-c source, to generate one digit of an unambiguous, multi-digit, digital rod position signal. Since only one signal wire to the remote electronics is required for each set of coils, and since they only carry a voltage signal, the required wiring is minimized. Compensation is provided to maintain the location of the rod end relative to each coil at which the digital signal changes state despite variations in temperature and voltage.

REFERENCES:
patent: 3846771 (1974-11-01), Young et al.
patent: 3852661 (1974-12-01), Szabo et al.
patent: 3858191 (1974-12-01), Neuner et al.
patent: 3893090 (1975-07-01), Neuner et al.

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