Scanning optical pyrometer for measuring temperatures in hollow cathodes

Life-limiting processes in hollow cathodes are determined largely by the temperature of the electron emitter. To support cathode life assessment, a noncontact temperature measurement technique which employs a stepper motor-driven fiber optic probe was developed. The probe is driven inside the hollow...

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Bibliographic Details
Published in:Review of scientific instruments 2007-09, Vol.78 (9), p.093101-093101
Main Authors: Polk, J. E., Marrese-Reading, C. M., Thornber, B., Dang, L., Johnson, L. K., Katz, I.
Format: Article
Language:English
Subjects:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
ELECTRONS
FIBERS
HOLLOW CATHODES
OPERATION
OPTICAL PYROMETERS
ORIFICES
OVENS
PLATES
PROBES
SENSORS
TEMPERATURE DISTRIBUTION
TEMPERATURE MEASUREMENT
THERMOCOUPLES
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Summary:Life-limiting processes in hollow cathodes are determined largely by the temperature of the electron emitter. To support cathode life assessment, a noncontact temperature measurement technique which employs a stepper motor-driven fiber optic probe was developed. The probe is driven inside the hollow cathode and collects light radiated by the hot interior surface of the emitter. Ratio pyrometry is used to determine the axial temperature profile. Thermocouples on the orifice plate provide measurements of the external temperature during cathode operation and are used to calibrate the pyrometer system in situ with a small oven enclosing the externally heated cathode. The diagnostic method and initial measurements of the temperature distribution in a hollow cathode are discussed.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.2774828