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

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

Full Record
Other Related Research

Abstract

A device for uncovering imperfections in electrical conducting wire, particularly superconducting wire, by detecting variations in eddy currents. Eddy currents effect the magnetic field in a gap of an inductor, contained in a modified commercial ferrite core, through which the wire being tested is passed. A small increase or decrease in the amount of conductive material, such as copper, in a fixed cross section of wire will unbalance a bridge used to measure the impedance of the inductor, tripping a detector and sounding an alarm.

Inventors:

Gibson, George H. ^[1]; Smits, Robert G. ^[1]; Eberhard, Philippe H. ^[2]

(Lafayette, CA)
(El Cerrito, CA)

Issue Date:: 1989-01-01

Research Org.:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA

OSTI Identifier:: 867097

Patent Number(s):: 4864236

Assignee:: United States of America as represented by United States (Washington, DC) LBNL

DOE Contract Number:: AC03-76SF00098

Resource Type:: Patent

Country of Publication:: United States

Language:: English

Subject:: wire; inhomogeneity; detector; core; opposing; pole; pieces; guide; adjacent; device; uncovering; imperfections; electrical; conducting; particularly; superconducting; detecting; variations; eddy; currents; effect; magnetic; field; gap; inductor; contained; modified; commercial; ferrite; tested; passed; increase; decrease; amount; conductive; material; copper; fixed; section; unbalance; bridge; measure; impedance; tripping; sounding; alarm; electrical conducting; pole pieces; eddy current; conductive material; magnetic field; superconducting wire; eddy currents; ferrite core; opposing pole; pole piece; conducting wire; detecting variations; /324/

Citation Formats


                    Gibson, George H., Smits, Robert G., and Eberhard, Philippe H. Wire inhomogeneity detector having a core with opposing pole pieces and guide pieces adjacent the opposing pole pieces.  United States: N. p., 1989. 
        Web.

Copy to clipboard


                    Gibson, George H., Smits, Robert G., & Eberhard, Philippe H. Wire inhomogeneity detector having a core with opposing pole pieces and guide pieces adjacent the opposing pole pieces.  United States.

Copy to clipboard


                    Gibson, George H., Smits, Robert G., and Eberhard, Philippe H. Sun .  
        "Wire inhomogeneity detector having a core with opposing pole pieces and guide pieces adjacent the opposing pole pieces".  United States.  https://www.osti.gov/servlets/purl/867097.

Copy to clipboard


                    
@article{osti_867097,

  title        = {Wire inhomogeneity detector having a core with opposing pole pieces and guide pieces adjacent the opposing pole pieces},

  author       = {Gibson, George H. and Smits, Robert G. and Eberhard, Philippe H.},

  abstractNote = {A device for uncovering imperfections in electrical conducting wire, particularly superconducting wire, by detecting variations in eddy currents. Eddy currents effect the magnetic field in a gap of an inductor, contained in a modified commercial ferrite core, through which the wire being tested is passed. A small increase or decrease in the amount of conductive material, such as copper, in a fixed cross section of wire will unbalance a bridge used to measure the impedance of the inductor, tripping a detector and sounding an alarm.},

  doi          = {},

  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {1989},

  month        = {1}

}

Copy to clipboard

Patent:

View Patent

Save / Share:

Export Metadata

Save to My Library

Similar records in DOE Patents and OSTI.GOV collections:

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

Patent 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-blockmore »« less
Determining resistivity of a formation adjacent to a borehole having casing with an apparatus having all current conducting electrodes within the cased well

Patent Vail, III, William Banning (Bothell, WA)

Methods of operation of different types of multiple electrode apparatus vertically disposed in a cased well to measure information useful to determine the resistivity of adjacent geological formations from within the cased well are described. The multiple electrode apparatus has a plurality of spaced apart voltage measurement electrodes that electrically engage a portion of the interior of the cased well. During measurements of information useful to determine formation resistivity, current is conducted between a first current conducting electrode in electrical contact with the interior of the cased well to a second current conducting electrode that is also in electrical contactmore »« less
Full Text Available
Determining resistivity of a formation adjacent to a borehole having casing using multiple electrodes and with resistances being defined between the electrodes

Patent Vail, III, William B. (Bothell, WA)

Methods of operation of different types of multiple electrode apparatus vertically disposed in a cased well to measure information related to the resistivity of adjacent geological formations from inside the cased well. The multiple electrode apparatus have a minimum of three spaced apart voltage measurement electrodes that electrically engage the interior of the cased well. Measurement information is obtained related to current which is caused to flow from the cased well into the adjacent geological formation. First compensation information is obtained related to a first casing resistance between a first pair of the spaced apart voltage measurement electrodes. Second compensationmore »« less
Full Text Available
Determining resistivity of a formation adjacent to a borehole having casing by generating constant current flow in portion of casing and using at least two voltage measurement electrodes

Patent Vail, III, William Banning (Bothell, WA)

Methods of operation of different types of multiple electrode apparatus vertically disposed in a cased well to measure information related to the resistivity of adjacent geological formations from within the cased well are described. The multiple electrode apparatus has a minimum of two spaced apart voltage measurement electrodes that electrically engage a first portion of the interior of the cased well and that provide at least first voltage information. Current control means are used to control the magnitude of any selected current that flows along a second portion of the interior of the casing to be equal to a predeterminedmore »« less
Full Text Available
Read/write head having a GMR sensor biased by permanent magnets located between the GMR and the pole shields

Patent Yuan, Samuel W. (San Carlos, CA); Rottmayer, Robert Earl (Fremont, CA); Carey, Matthew J. (San Jose, CA)

A compact read/write head having a biased giant magnetoresistive sensor. Permanent magnet films are placed adjacent to the giant magnetoresistive sensor operating in the current-perpendicular-to the-plane (Cpp) mode and spaced with respect to the sensor by conducting films. These permanent magnet films provide a magnetic bias. The bias field is substantial and fairly uniform across sensor height. Biasing of the giant magnetoresistive sensor provides distinguishable response to the rising and falling edges of a recorded pulse on an adjacent recording medium, improves the linearity of the response, and helps to reduce noise. This read/write head is much simpler to fabricatemore »« less
Full Text Available

Similar Records