Multiple Frequency Digital Eddy Current Inspection System.
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
Pagination or Media Count:
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
- Electrical and Electronic Equipment
- Test Facilities, Equipment and Methods