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Title: Apparatus and method for microwave processing of materials

Abstract

A variable frequency microwave heating apparatus (10) designed to allow modulation of the frequency of the microwaves introduced into a furnace cavity (34) for testing or other selected applications. The variable frequency heating apparatus (10) is used in the method of the present invention to monitor the resonant processing frequency within the furnace cavity (34) depending upon the material, including the state thereof, from which the workpiece (36) is fabricated. The variable frequency microwave heating apparatus (10) includes a microwave signal generator (12) and a high-power microwave amplifier (20) or a microwave voltage-controlled oscillator (14). A power supply (22) is provided for operation of the high-power microwave oscillator (14) or microwave amplifier (20). A directional coupler (24) is provided for detecting the direction and amplitude of signals incident upon and reflected from the microwave cavity (34). A first power meter (30) is provided for measuring the power delivered to the microwave furnace (32). A second power meter (26) detects the magnitude of reflected power. Reflected power is dissipated in the reflected power load (28).

Inventors:
 [1];  [2];  [3];  [4]
+ Show Inventor Affiliations
  1. Lake in the Hills, IL
  2. Oak Ridge, TN
  3. Clinton, TN
  4. Chapel Hill, NC
Issue Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
870435
Patent Number(s):
5521360
Assignee:
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN)
Patent Classifications (CPCs):
H - ELECTRICITY H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR H05B - ELECTRIC HEATING
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02B - CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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DOE Contract Number:  
AC05-84OR21400
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
apparatus; method; microwave; processing; materials; variable; frequency; heating; 10; designed; allow; modulation; microwaves; introduced; furnace; cavity; 34; testing; selected; applications; monitor; resonant; depending; material; including; workpiece; 36; fabricated; signal; generator; 12; high-power; amplifier; 20; voltage-controlled; oscillator; 14; power; supply; 22; provided; operation; directional; coupler; 24; detecting; direction; amplitude; signals; incident; reflected; meter; 30; measuring; delivered; 32; 26; detects; magnitude; dissipated; load; 28; high-power microwave; furnace cavity; microwaves introduced; allow modulation; power load; directional coupler; microwave signal; frequency microwave; variable frequency; power supply; microwave cavity; signal generator; microwave heating; power meter; power delivered; microwave amplifier; reflected power; heating apparatus; microwave furnace; power microwave; wave signal; selected applications; microwave oscillator; microwave processing; microwave process; wave cavity; controlled oscillator; /219/

Citation Formats

Johnson, Arvid C, Lauf, Robert J, Bible, Don W, and Markunas, Robert J. Apparatus and method for microwave processing of materials. United States: N. p., 1996. Web.
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Johnson, Arvid C, Lauf, Robert J, Bible, Don W, & Markunas, Robert J. Apparatus and method for microwave processing of materials. United States.
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Johnson, Arvid C, Lauf, Robert J, Bible, Don W, and Markunas, Robert J. Mon . "Apparatus and method for microwave processing of materials". United States. https://www.osti.gov/servlets/purl/870435.
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@article{osti_870435,
title = {Apparatus and method for microwave processing of materials},
author = {Johnson, Arvid C and Lauf, Robert J and Bible, Don W and Markunas, Robert J},
abstractNote = {A variable frequency microwave heating apparatus (10) designed to allow modulation of the frequency of the microwaves introduced into a furnace cavity (34) for testing or other selected applications. The variable frequency heating apparatus (10) is used in the method of the present invention to monitor the resonant processing frequency within the furnace cavity (34) depending upon the material, including the state thereof, from which the workpiece (36) is fabricated. The variable frequency microwave heating apparatus (10) includes a microwave signal generator (12) and a high-power microwave amplifier (20) or a microwave voltage-controlled oscillator (14). A power supply (22) is provided for operation of the high-power microwave oscillator (14) or microwave amplifier (20). A directional coupler (24) is provided for detecting the direction and amplitude of signals incident upon and reflected from the microwave cavity (34). A first power meter (30) is provided for measuring the power delivered to the microwave furnace (32). A second power meter (26) detects the magnitude of reflected power. Reflected power is dissipated in the reflected power load (28).},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1996},
month = {1}
}
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Works referenced in this record:

Accelerated imidization reactions using microwave radiation
journal, July 1992

Frequency Agile Sources for Microwave Ovens
journal, January 1979

Use of Sheath Heiix Slow-wave Structure as an Applicator in Microwave Heating Systems
journal, January 1981

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