Apparatus and method for microwave processing of materials

Details Apparatus and method for microwave processing of materials Apparatus and method for microwave processing of materials

H - Electricity

05

B

H05B 6/68 (2006.01) B29C 65/14 (2006.01) B29C 65/36 (2006.01) H05B 6/66 (2006.01) H05B 6/70 (2006.01) H05B 6/74 (2006.01) H05B 6/76 (2006.01) H05B 6/80 (2006.01)

Patent

CA 2186883

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 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).

Appareil de chauffage par des micro-ondes à fréquence variable (10) conçu pour permettre de moduler la fréquence des micro-ondes introduites dans la cavité d'un four (34) en vue d'essais ou d'autres applications. Ledit appareil (10) sert dans le cadre de cette invention à contrôler la fréquence de résonance de la cavité (34) pendant un traitement en fonction du type et de l'état du matériau constitutif de la pièce (36). L'appareil se compose d'un générateur de micro-ondes (12) et d'un amplificateur de micro-ondes puissant (20) ou d'un oscillateur à micro-ondes (14) commandé par tension, et de l'alimentation correspondante (22); il comporte en outre un coupleur directionnel (24) servant à détecter la direction et l'amplitude des ondes incidentes et réfléchies par la cavité (34), un premier compteur (30) mesurant la puissance des micro-ondes fournies au four (32) et un second compteur (26) mesurant la puissance réfléchie. La puissance réfléchie est dissipée dans la charge de puissance réfléchie (28).

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