Reference standard block for use in nondestructive test probe calibration and method of manufacture thereof
First Claim
1. A method of manufacturing a reference standard block for use in nondestructive magnetic test probe calibration, the method comprising the steps of:
- (a) forming an indentation having a longitudinal axis of prescribed dimensions in a metal block, said indentation extending inwardly of said block from an opening formed in an outer surface of said block; and
(b) compressing said block in a direction generally transverse of said longitudinal axis of said indentation with a force sufficient to substantially close said indentation opening, whereby the block is responsive to a magnetically induced eddy current to provide an indication incident to a nondestructive magnetic test probe calibration.
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Accused Products
Abstract
A reference standard and a method for manufacturing a reference standard for use in calibrating an eddy current probe is disclosed. The reference standard is produced from a block of metal that is deformed by an indentation tool to provide a notch of prescribed dimensions. The reference standard is compressed along an axis substantially transverse to the longitudinal axis of the notch to substantially close the notch. A family of reference standards formed in this manner can be produced to calibrate an eddy current probe prior to use of the probe in evaluating metal components such as aircraft framework for the presence of fatigue cracks and the like.
28 Citations
20 Claims
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1. A method of manufacturing a reference standard block for use in nondestructive magnetic test probe calibration, the method comprising the steps of:
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(a) forming an indentation having a longitudinal axis of prescribed dimensions in a metal block, said indentation extending inwardly of said block from an opening formed in an outer surface of said block; and (b) compressing said block in a direction generally transverse of said longitudinal axis of said indentation with a force sufficient to substantially close said indentation opening, whereby the block is responsive to a magnetically induced eddy current to provide an indication incident to a nondestructive magnetic test probe calibration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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- 14. A reference standard block for calibrating nondestructive magnetic testing equipment, comprising a metallic material having a compressed indentation of prescribed dimensions and having a longitudinal axis formed by compressing said block in a direction generally transverse said longitudinal axis the block being responsive to a magnetically induced eddy current to provide an indication of the presence of the block indentation incident to nondestructive magnetic testing equipment calibration.
Specification