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Title: Apparatus and method for microwave processing of materials

Disclosed is a variable frequency microwave heating apparatus designed to allow modulation of the frequency of the microwaves introduced into a furnace cavity for testing or other selected applications. The variable frequency heating apparatus is used in the method of the present invention to monitor the resonant processing frequency within the furnace cavity depending upon the material, including the state thereof, from which the workpiece is fabricated. The variable frequency microwave heating apparatus includes a microwave signal generator and a high-power microwave amplifier or a microwave voltage-controlled oscillator. A power supply is provided for operation of the high-power microwave oscillator or microwave amplifier. A directional coupler is provided for detecting the direction and amplitude of signals incident upon and reflected from the microwave cavity. A first power meter is provided for measuring the power delivered to the microwave furnace. A second power meter detects the magnitude of reflected power. Reflected power is dissipated in the reflected power load. 10 figs.
Inventors:
; ; ;
Issue Date:
OSTI Identifier:
238065
Assignee:
Martin Marietta Energy Systems, Inc., Oak Ridge, TN (United States) PTO; SCA: 320303; 360101; 360201; 360601; PA: EDB-96:093146; SN: 96001594373
Patent Number(s):
US 5,521,360/A/
Application Number:
PAN: 8-306,305
Contract Number:
AC05-84OR21400
Resource Relation:
Other Information: PBD: 28 May 1996
Research Org:
Lockheed Martin Energy Syst Inc
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 36 MATERIALS SCIENCE; MATERIALS; FABRICATION; MICROWAVE EQUIPMENT; DESIGN; MICROWAVE HEATING; FREQUENCY MODULATION; POWER SUPPLIES; POWER LOSSES; MONITORING; PROCESS CONTROL