Indicating system for use in nondestructive testing
AssigneeMagnaflux Corporation
InventorsJohn J. Flaherty, Eric J. Strauts
Life of this patent
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Abstract
An indicating system is disclosed for use with nondestructive testing systems of various types including an eddy current instrument in which the characteristics of a specimen structure are indicated by the form, position and dimensions of a trace on a screen. The system indicates whether or not the relationship of two test signals is within certain limits which can be shown in the form of outlines or a series of contiguous boxes on a screen. Prior to the testing of a structure of unknown characteristics, such limits may be learned or recorded by the system either during the manual manipulation of a joystick control or the like or during the testing of a structure of known or standard characteristics.
Claims25
In an indicating system for a nondestructive testing system which includes means for concurrently developing first and second analog test signals having amplitudes which concurrently vary relative to each other as a function of characteristics of a structure under test, said indicating system comprising:
- recording means for recording digital reference signals which establish set limits with respect to relative variations of the amplitudes of said first and second analog signals and which define a certain range of characteristics of a structure under test, converter means for converting said first and second analog test signals into first and second digital test signals, comparator means for comparing said first and second digital test signals and said digital reference signals, and output means coupled to said comparator means for output of a signal indicating the existence or non-existence of correspondence between the relationship of the amplitudes of said first and second analog signals and said set limits.
Dependencies are inferred from the claim text.