Inductive pick-up for producing a signal representing the relati

Details Inductive pick-up for producing a signal representing the relati Inductive pick-up for producing a signal representing the relati

1992-08-14

1995-12-12

O'Shea, Sandra L

Electricity: measuring and testing

Magnetic

Displacement

32420722, G01B 714, G01B 730

Patent

active

054753023

ABSTRACT:
A pick-up for the inductive production of a measurement signal reproducing the relative position of first and second bodies which are movable relative to each other includes at least one exciter coil operable with alternating current for the production of a magnetic flux, a measurement coil arrangement at which voltages from which the measurement signal is derived can be taken off, and a flux guide means of ferromagnetic material for carrying the magnetic flux produced by the exciter coil on a closed measurement path in such a way that at least a part of the magnetic flux passes through the measurement coil arrangement, and at least one of the voltages which can be taken off at the measurement coil arrangement changes in dependence on the movement of one of the bodies relative to the other. To achieve a high degree of measurement accuracy and characteristic fidelity, the measurement signal is formed as a quotient of first and second intermediate signals of which at least one depends on the instantaneous position of one of the bodies relative to the other, and each of the intermediate signals involves differences of voltages which the measurement coil arrangement supplies.

REFERENCES:
patent: 2964716 (1960-12-01), Berman
patent: 3045227 (1962-07-01), Minas
patent: 3732553 (1973-05-01), Hardway, Jr.
patent: 3786459 (1974-01-01), Berger
patent: 3949339 (1976-04-01), Kennedy
patent: 4013911 (1977-03-01), Fujiwara et al.
patent: 4695795 (1987-09-01), Nakamizo et al.
patent: 4878020 (1989-10-01), Karna al.
patent: 5107212 (1992-04-01), Dobler et al.
patent: 5323109 (1994-06-01), Mehnert et al.

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