Wire inhomogeneity detector having a core with opposing pole pieces and guide pieces adjacent the opposing pole pieces

Patent · Tue Sep 05 04:00:00 EDT 1989

OSTI ID:7199825

Gibson, G H; Smits, R G; Eberhard, P H

This patent describes a wire inhomogeneity detector assembly for detecting changes in the conductive properties of a wire as the wire is passed therethrough. It comprises: a coil assembly through which a wire containing conductive material is adapted to be pressed in a direction substantially perpendicular to a longitudinal axis of the coil assembly. The coil assembly comprising a single ferrite core having a pair of opposing pole pieces between which are an associated conductive wire to be tested is adapted to be passed, each of the pole pieces having a coil wound therearound. The coil assembly including a guide-block consisting of a pair of guide pieces mounted adjacent to ends of the opposing pole pieces for guiding an associated conductive wire between the pole pieces and for reducing stray magnetic field lines. The guide pieces being positioned closely adjacent an associated conductive wire passing therebetween; an impedance bridge adjusted to an null balance point operatively connected to the coil assembly which measures the impedance of the coil assembly and is unbalanced by changes in eddy currents generated in the coil assembly; and a filter detector alarm assembly operatively connected to an output of the impedance bridge. The filter detector alarm assembly including an input bandpass filter detector alarm assembly including an input bandpass filter operatively connected to a differential comparator, the output of which triggers an alarm.

• Assignee: Dept. of Energy, Washington, DC
• Patent Number(s): A; US 4864236
• Application Number: PPN: US 6-413589A
• OSTI ID: 7199825
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104 -- Metals & Alloys-- Physical Properties
426001* -- Engineering-- Superconducting Devices & Circuits-- (1990-)
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALARM SYSTEMS
ALLOYS
CARBON ADDITIONS
ELECTRIC IMPEDANCE
ELECTRICAL PROPERTIES
FERRITE
FILTERS
IMPEDANCE
IRON ALLOYS
MAGNETIC FIELDS
MEASURING INSTRUMENTS
PERFORMANCE
PHYSICAL PROPERTIES
SUPERCONDUCTING COILS
SUPERCONDUCTING WIRES
WIRES