A Method of Calculating Sublimation Rate for Thermionic Cathodes

Abstract

An improved method of measuring cathode sublimation rates using a crystal oscillator is proposed; in the method, the distance between the crystal (substrate) and cathode (source) is smaller than is usual. Thus, more sublimation products from the cathode (source) can be received by the crystal and consequently the method can serve in measuring lower sublimation rates. Formulas for calculating the sublimation rate are derived and their precision is stated. In the paper, a method of preventing the resonant frequency change caused by temperature changes is also given. The experimental results show that 1Hz of shift in the resonant frequency can be detected when the oscillation frequency is 5MHz.

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Document Details

Document Type
Technical Report
Publication Date
Jun 05, 1991
Accession Number
ADA239241

Entities

People

  • Wenxiang Guo

Organizations

  • National Air and Space Intelligence Center

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Boundaries
  • Climate Change
  • Crystal Oscillators
  • Diameters
  • Equations
  • Foreign Technology
  • Frequency
  • Mean Free Path
  • Measurement
  • Molecules
  • Oscillation
  • Oscillators
  • Resonant Frequency
  • Temperature Coefficients
  • Thermal Radiation
  • Three Dimensional
  • Vapor Pressure

Readers

  • Electronics Engineering
  • Thermal Physics or Thermal Science.