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Title: Use of miniature magnetic sensors for real-time control of the induction heating process

Abstract

A method of monitoring the process of induction heating a workpiece. A miniature magnetic sensor located near the outer surface of the workpiece measures changes in the surface magnetic field caused by changes in the magnetic properties of the workpiece as it heats up during induction heating (or cools down during quenching). A passive miniature magnetic sensor detects a distinct magnetic spike that appears when the saturation field, B.sub.sat, of the workpiece has been exceeded. This distinct magnetic spike disappears when the workpiece's surface temperature exceeds its Curie temperature, due to the sudden decrease in its magnetic permeability. Alternatively, an active magnetic sensor can also be used to measure changes in the resonance response of the monitor coil when the excitation coil is linearly swept over 0-10 MHz, due to changes in the magnetic permeability and electrical resistivity of the workpiece as its temperature increases (or decreases).

Inventors:
 [1];  [2];  [2]
  1. (Tijeras, NM)
  2. (Albuquerque, NM)
Publication Date:
Research Org.:
SANDIA CORP
OSTI Identifier:
874760
Patent Number(s):
US 6455825
Assignee:
Sandia Corporation (Albuquerque, NM) SNL
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
miniature; magnetic; sensors; real-time; control; induction; heating; process; method; monitoring; workpiece; sensor; located; near; outer; surface; measures; changes; field; caused; properties; heats; cools; quenching; passive; detects; distinct; spike; appears; saturation; bsubsat; exceeded; disappears; workpieces; temperature; exceeds; curie; due; sudden; decrease; permeability; alternatively; active; measure; resonance; response; monitor; coil; excitation; linearly; swept; 0-10; mhz; electrical; resistivity; increases; decreases; magnetic field; surface temperature; located near; heating process; induction heating; magnetic sensor; /219/148/266/324/

Citation Formats

Bentley, Anthony E., Kelley, John Bruce, and Zutavern, Fred J. Use of miniature magnetic sensors for real-time control of the induction heating process. United States: N. p., 2002. Web.
Bentley, Anthony E., Kelley, John Bruce, & Zutavern, Fred J. Use of miniature magnetic sensors for real-time control of the induction heating process. United States.
Bentley, Anthony E., Kelley, John Bruce, and Zutavern, Fred J. Tue . "Use of miniature magnetic sensors for real-time control of the induction heating process". United States. https://www.osti.gov/servlets/purl/874760.
@article{osti_874760,
title = {Use of miniature magnetic sensors for real-time control of the induction heating process},
author = {Bentley, Anthony E. and Kelley, John Bruce and Zutavern, Fred J.},
abstractNote = {A method of monitoring the process of induction heating a workpiece. A miniature magnetic sensor located near the outer surface of the workpiece measures changes in the surface magnetic field caused by changes in the magnetic properties of the workpiece as it heats up during induction heating (or cools down during quenching). A passive miniature magnetic sensor detects a distinct magnetic spike that appears when the saturation field, B.sub.sat, of the workpiece has been exceeded. This distinct magnetic spike disappears when the workpiece's surface temperature exceeds its Curie temperature, due to the sudden decrease in its magnetic permeability. Alternatively, an active magnetic sensor can also be used to measure changes in the resonance response of the monitor coil when the excitation coil is linearly swept over 0-10 MHz, due to changes in the magnetic permeability and electrical resistivity of the workpiece as its temperature increases (or decreases).},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {1}
}

Patent:

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