Eddy current inspection tool which is selectively operable in a discontinuity detection mode and a discontinuity magnitude mode
A miniaturized inspection tool, for testing and inspection of metal objects in locations with difficult accessibility, which comprises eddy current sensing equipment with a probe coil, and associated coaxial coil cable, coil energizing means, and circuit means responsive to impedance changes in the coil as effected by induced eddy currents in a test object to produce a data output signal proportional to such changes. The coil and cable are slideably received in the utility channel of the flexible insertion tube of fiberoptic scope. The scope is provided with light transmitting and receiving fiberoptics for viewing through the flexible tube, and articulation means for articulating the distal end of the tube and permitting close control of coil placement relative to a test object. The eddy current sensing equipment includes a tone generator 30 for generating audibly signals responsive to the data output signal. In one selected mode of operation, the tone generator responsive to the output signal above a selected level generates a constant single frequency tone for signaling detection of a discontinuity and, in a second selected mode, generates a tone whose frequency is proportional to the difference between the output signal and a predetermined selected threshold level. 5 figs.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA
- DOE Contract Number:
- W-7405-ENG-48
- Assignee:
- OAK; EDB-94-125146
- Patent Number(s):
- A; US 4412177
- Application Number:
- PPN: US 6-201946
- OSTI ID:
- 7003172
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
420500* -- Engineering-- Materials Testing
CABLES
COAXIAL CABLES
CONDUCTOR DEVICES
EDDY CURRENT TESTING
ELECTRIC CABLES
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC TESTING
ELEMENTS
EQUIPMENT
FIBER OPTICS
LIGHT TRANSMISSION
MATERIALS TESTING
METALS
MINIATURIZATION
NONDESTRUCTIVE TESTING
PROBES
TESTING