NONDESTRUCTIVE TESTING OF GLASS EPOXY POLARIS MOTOR CASES

Abstract

The laboratory model of the test instrument was mechanized to measure the dissipation factor of the dielectric (the motor case). The dissipation factor of the dielectric varies as a function of moisture content. The measurement method uses the Q of a very stable tuned circuit as a standard for comparison. A concentric probe is connected in parallel with the capacitor element of the tuned circuit. The sample to be investigated is placed on this probe and thus forms the dielectric portion of a capacitor. If the dissipation factor of this dielectric is changed by water absorption then the resultant Q of the tuned circuit will be lowered. (Author)

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1961
Accession Number
AD0265918

Entities

People

  • John E. Abel

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Absorption
  • Capacitors
  • Circuits
  • Dissipation
  • Dissipation Factor
  • Measurement
  • Moisture
  • Moisture Content
  • Nondestructive Testing
  • Resonant Circuits
  • Standards
  • Tuned Circuits

Readers

  • Electrical Engineering
  • Rocket Propulsion.