Accession Number : AD0164900

Title :   Non-Destructive Testing of Metal Structures by Measuring Exo-Electron Emission.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C

Personal Author(s) : Hoenig,Stuart A. ; Ott,William E.

Report Date : 18 JUN 1974

Pagination or Media Count : 7

Abstract : A method for the non-destructive testing of a metal structure is provided that comprises heating the structure in the presence of ultraviolet radiation to a temperature sufficient to cause exo-electron emission from the structure. The method continuously measures an electrical current resulting from exo-electrons flowing to a metal collector maintained at a positive potential, and determines the magnitude of the electrical current as a measure of fatigue damage.

Descriptors :   *Structural members, *Nondestructive testing, *Patents, Metals, Electron emission, Heating, Ultraviolet radiation

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE