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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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Scanning optical pyrometer for measuring temperatures in hollow cathodes.

J E Polk1, C M Marrese-Reading, B Thornber

  • 1Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA.

The Review of Scientific Instruments
|October 2, 2007
PubMed
Summary

A new noncontact temperature measurement technique was developed to assess hollow cathode life. This method uses a fiber optic probe and ratio pyrometry to map internal emitter temperatures, aiding in predicting component lifespan.

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Area of Science:

  • Physics
  • Materials Science
  • Engineering

Background:

  • Hollow cathode performance and lifespan are significantly influenced by the electron emitter's temperature.
  • Accurate temperature measurement is crucial for predicting cathode longevity and optimizing operational parameters.

Purpose of the Study:

  • To develop and validate a noncontact temperature measurement technique for hollow cathodes.
  • To enable precise assessment of electron emitter temperature profiles for life-limiting process analysis.

Main Methods:

  • A stepper motor-driven fiber optic probe was engineered to navigate the interior of the hollow cathode.
  • Ratio pyrometry was employed to analyze the emitted light and determine the axial temperature profile.
  • In situ calibration was performed using thermocouples and an external heating oven to ensure measurement accuracy.

Main Results:

  • The developed diagnostic method successfully measured the axial temperature distribution within the hollow cathode.
  • Initial measurements provided insights into the thermal behavior of the electron emitter during operation.

Conclusions:

  • The noncontact fiber optic probe and ratio pyrometry system offer a viable method for internal hollow cathode temperature diagnostics.
  • This technique supports improved cathode life assessment and operational management by providing critical thermal data.