Accession Number : ADD007372

Title :   Multiple Frequency Digital Eddy Current Inspection System.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Flora,John H ; Gruber,Henry T

Report Date : 10 Jun 1980

Pagination or Media Count : 5

Abstract : This patent discloses an apparatus for inspecting for cracks under installed fasteners and the like using a multiple frequency digital eddy current system. A computer with a plurality of digital arrays generate drive signals which are converted to analog and applied to the test coil, a second set of digital arrays generate balance signals, are adjusted in amplitude and phase and drive signals so that the output of the test coil is zero in a test specimen, output signals from a work piece are processed in the computer giving phase-sensitive crack detection. (Author)

Descriptors :   *Patents, *Nondestructive testing, Eddy currents, Phase detectors, Cracks

Subject Categories : Electrical and Electronic Equipment
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE