Accession Number : AD0265918

Title :   NONDESTRUCTIVE TESTING OF GLASS EPOXY POLARIS MOTOR CASES

Descriptive Note : Technical memo.

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : ABEL,JOHN E.

Report Date : DEC 1961

Pagination or Media Count : 13

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)

Descriptors :   *HYGROMETERS, *ROCKET ENGINE CASES, ABSORPTION, DETECTION, DETERMINATION, DIELECTRIC PROPERTIES, EPOXY RESINS, FIBERS, FILAMENT WOUND CONSTRUCTION, FILAMENTS, GLASS TEXTILES, GUIDED MISSILES, LAMINATES, MEASUREMENT, MOISTURE, NONDESTRUCTIVE TESTING, PLASTICS, SURFACE TO SURFACE, TEST EQUIPMENT, UNDERWATER TO SURFACE

Distribution Statement : APPROVED FOR PUBLIC RELEASE