Use of a variable frequency source with a single-mode-cavity to process ceramic filaments
- Los Alamos National Lab., NM (United States)
Rapid feedback control is needed for practical microwave processing of continuous ceramic oxide filaments to regulate the process temperature where the dielectric properties of the filaments change rapidly with temperature. A broadband traveling wave tube (TWT) amplifier provides a highly versatile process control platform for filament processing. By comparing a RF signal from the cavity to a reference signal from the TWT, phase information can be used in a negative feedback loop to allow the oscillator to track the cavity frequency as it shifts due to the changing dielectric constant in the filaments being heated. By sampling the electric field level in the cavity with a detector, amplitude control can be done to maintain a constant absorbed power in a fiber tow, which is important for controlling the tow heating and temperature. The system design will be discussed along with application data for commercial ceramic samples.
- OSTI ID:
- 269913
- Report Number(s):
- CONF-9505249-; TRN: 96:002970-0016
- Resource Relation:
- Conference: 97. American Ceramic Society (ACS) annual meeting and exposition, Cincinnati, OH (United States), 1-4 May 1995; Other Information: PBD: 1995; Related Information: Is Part Of Ceramic transactions: Microwaves - theory and application in materials processing III. Volume 49; PB: 666 p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Use of a variable frequency source with a single-mode cavity to process ceramic filaments
Materials processing using a variable frequency microwave furnace