Active millimeter-wave pyrometer

Journal Article · Tue Aug 01 04:00:00 EDT 1995 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.1145376· OSTI ID:85804

Woskov, P P; Cohn, D R; Rhee, D Y; Thomas, P ^[1]; Titus, C H ^[2]; Surma, J E ^[3]

---

1. Plasma Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
2. T&R Associates, Wayne, Pennsylvania 19087 (United States)
3. Pacific Northwest Laboratories, Richland, Washington 99352 (United States)

A 135 GHz heterodyne receiver with a rotatable graphite waveguide/mirror system has been implemented on a waste remediation direct-current arc furnace for internal surface temperature measurements. The linear temperature measurement range extends from {lt}1{degree} to approximately 15,000 {degree}C relative to ambient with a simultaneous capability to monitor surface reflectivity with the local oscillator leakage. Reliable and robust operation on a continuous 24 h basis in a smoky, dirty furnace environment is demonstrated for a total of five furnace runs reaching a maximum temperature of 2200 {degree}C. Complete temperature profile measurements with approximately 5 cm spatial resolution clearly documented thermal gradients on the slag melt surface and refractory walls and ceiling for all operating regimes of the furnace. The unique active probing capability of this instrument provided additional real-time information on melt surface turbulence, changing furnace wall emissivity, and millimeter-wave optic losses inside the furnace. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.

• OSTI ID: 85804
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 8 Vol. 66; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

44 INSTRUMENTATION
INCLUDING NUCLEAR AND PARTICLE DETECTORS
ARC FURNACES
COMBUSTION
HETERODYNE RECEIVERS
IGNITION
MICROWAVE RADIATION
PLATINUM
PLATINUM BASE ALLOYS
PROPELLANTS
PYROMETERS
REAL TIME SYSTEMS
RHODIUM ALLOYS
SPATIAL RESOLUTION
TEMPERATURE MEASUREMENT
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
THERMOCOUPLES