Inductive loop system for detection of an electrically conductiv

Details Inductive loop system for detection of an electrically conductiv Inductive loop system for detection of an electrically conductiv

1984-10-18

1986-06-17

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

324329, 324336, 340941, G08G 101, G01N 2772, G01V 311

Patent

active

045958777

ABSTRACT:
An eddy-current loop detector operates to sense the presence of an electrically conductive object by applying D.C. onto a conducting loop so that a permanent magnetic field is induced, which field partly penetrates into the object; ensuring the quick cessation of self-inductive transient operation of the loop when the D.C. is switched off; and measuring the change in the part of the flux passing through the measuring loop arising from eddy-currents induced in the conductive object, and evaluating such change while the relatively slowly decreasing flux is maintained. By repeating these operations with the desired frequency, the eddy-current detector is well suited for continuous measuring of the position of the object.

REFERENCES:
patent: 3263160 (1966-07-01), Dolan et al.
patent: 3315155 (1967-04-01), Colani
patent: 3538430 (1970-11-01), Bulgakov et al.
patent: 3737768 (1973-06-01), Lazenby et al.
patent: 4247821 (1981-01-01), Buselli et al.

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