Object detecting device

Details Object detecting device Object detecting device

1993-08-24

1995-06-20

O'Shea:, Sandra

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

32420717, 324225, 340941, G01N 2772, G08G 1042

Patent

active

054263638

ABSTRACT:
An object detecting device for detecting an object at least partly having a magnetic substance or magnetic-flux permeable material is formed of a detection coil arrangement including a primary coil for generating magnetic flux and a secondary coil disposed separately from the primary coil at a predetermined interval for receiving the magnetic flux from the primary coil; and a detection circuit for detecting an increase of the magnetic flux transmitted to the secondary coil due to presence of the object within a space between the primary and secondary coils. The detection circuit produces signal indicating the presence of the object upon detection of the presence.

REFERENCES:
patent: 4232285 (1980-11-01), Narbaits-Jaureguy et al.
patent: 4276539 (1981-06-01), Eshraghian et al.
patent: 4383239 (1983-05-01), Robert
patent: 4894617 (1990-01-01), Urbani
patent: 4968979 (1990-11-01), Mizuno et al.

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