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:
-
- Tijeras, NM
- Albuquerque, NM
- Issue Date:
- Research Org.:
- Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)
- OSTI Identifier:
- 874760
- Patent Number(s):
- 6455825
- Assignee:
- Sandia Corporation (Albuquerque, NM)
- Patent Classifications (CPCs):
-
G - PHYSICS G05 - CONTROLLING G05D - SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
H - ELECTRICITY H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR H05B - ELECTRIC HEATING
- 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 = {Tue Jan 01 00:00:00 EST 2002},
month = {Tue Jan 01 00:00:00 EST 2002}
}