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Temperature Distributions in Hollow Cathode EmittersLife-limiting processes in hollow cathodes are determined largely by the temperature of the emitter. To support development of cathode life models we have developed a noncontact temperature measurement technique which employs a stepper motor-driven fiber optic probe. The probe is driven inside the hollow cathode and collects light radiated by the hot interior surface of the emitter. Ratio pyrometry is used determine the axial temperature profile. Thermocouples on the orifice plate provide measurements ofthe external temperature during cathode operation and are used to calibrate the pyrometer system in situ with a small oven enclosing the externally heated cathode. Initial measurements of the temperature distribution in a hollow cathode with the same geometry as a cathode that failed after operating at 12 A emission current for 27800 hours are discussed.
Document ID
20110016080
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Polk, Jay
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Marrese, Colleen
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Thornber, Ben
(International Space Univ., Inc. Strasbourg, France)
Dang, Lisa
(Northrop Grumman Space Technology Redondo Beach, CA, United States)
Johnson, Lee
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 25, 2013
Publication Date
July 11, 2004
Subject Category
Electronics And Electrical Engineering
Report/Patent Number
AAIA Paper-2004-4116
Meeting Information
Meeting: 40th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit
Location: Fort Lauderdale, FL
Country: United States
Start Date: July 11, 2004
End Date: July 14, 2004
Sponsors: American Inst. of Aeronautics and Astronautics, American Society of Mechanical Engineers, Society of Automotive Engineers, Inc., American Society for Engineering Education
Distribution Limits
Public
Copyright
Other
Keywords
ratio pyrometer system
hollow cathodes
temperature measurements

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