Graphite millimeter-wave waveguide and mirror for high temperature environments

Journal Article · Fri Dec 01 00:00:00 EST 1995 · IEEE Transactions on Microwave Theory and Techniques

DOI:https://doi.org/10.1109/22.477844· OSTI ID:197639

Woskov, P P ^[1]; Titus, C H ^[2]

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1. Massachusetts Inst. of Tech., Cambridge, MA (United States). Plasma Fusion Center
2. T and R Associates, Wayne, PA (United States)

A graphite helix corrugated waveguide with a miter mirror has been fabricated and used for 135 GHz pyrometer measurements on a high temperature plasma arc furnace. The guide has an internal diameter of 3.81 cm, a length of 123 cm, and a corrugation of 32 grooves/inch. One end of the guide was sealed with a Teflon window having moth eye surfaces to reduce reflections.The room temperature insertion loss of this guide assembly for HE{sub 11} mode propagation and launch was measured to be 0.5 {+-} 0.1 dB. It was used successfully in a high temperature environment where the miter mirror end reached incandescent temperatures in access of 1,200 C. High temperature graphite surface corrosion typically increased the insertion loss to 1.2 {+-} 0.2 dB but did not significantly affect the beam divergence.

• OSTI ID: 197639
• Journal Information: IEEE Transactions on Microwave Theory and Techniques, Vol. 43, Issue 12Pt1; Other Information: PBD: Dec 1995
• Country of Publication: United States
• Language: English

Related Subjects

44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
PYROMETERS
DESIGN
PLASMA FURNACES
TEMPERATURE MEASUREMENT
REAL TIME SYSTEMS
MONITORING
MICROWAVE EQUIPMENT
MEASURING INSTRUMENTS
INFRARED RADIATION
PERFORMANCE
ANTENNAS
RADIOMETERS