Accession Number : AD0163614

Title :   Probe for Detection of Surface Cracks in Metals Utilizing a Hall Probe.

Descriptive Note : Patent,

Corporate Author : OFFICE OF THE SECRETARY OF THE ARMY WASHINGTON D C

Personal Author(s) : Fowler,Kenneth A.

Report Date : 12 JAN 1971

Pagination or Media Count : 4

Abstract : The patent describes a Hall effect detector which is mounted between a pair of electrodes. The electrodes are moved along a current conducting surface having a crack, or suspected of having a crack or other flaw. The crack alters the flow of current and channels it between the electrodes thereby increasing the magnetic field in the area of the crack. The magnitude of the increase of the magnetic field indicates the size of the crack or flaw. The direction of the crack also affects the magnitude of the change. Therefore, the direction of the crack, as well as its depth and length, can be ascertained by probing with the present instrument, as taught herein.

Descriptors :   (*NONDESTRUCTIVE TESTING, HALL EFFECT), (*MAGNETIC DETECTORS, CRACKS), (*PATENTS, MAGNETIC DETECTORS), PROBES, ALLOYS

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE