skip to main content
DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Rotating concave eddy current probe

Abstract

A rotating concave eddy current probe for detecting fatigue cracks hidden from view underneath the head of a raised head fastener, such as a buttonhead-type rivet, used to join together structural skins, such as aluminum aircraft skins. The probe has a recessed concave dimple in its bottom surface that closely conforms to the shape of the raised head. The concave dimple holds the probe in good alignment on top of the rivet while the probe is rotated around the rivet's centerline. One or more magnetic coils are rigidly embedded within the probe's cylindrical body, which is made of a non-conducting material. This design overcomes the inspection impediment associated with widely varying conductivity in fastened joints.

Inventors:
 [1];  [1];  [1];  [1]
  1. Albuquerque, NM
Issue Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
936230
Patent Number(s):
7352176
Application Number:
11/502,085
Assignee:
Sandia Corporation (Albuquerque, NM)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G - PHYSICS G01 - MEASURING G01R - MEASURING ELECTRIC VARIABLES
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION

Citation Formats

Roach, Dennis P, Walkington, Phil, Rackow, Kirk A, and Hohman, Ed. Rotating concave eddy current probe. United States: N. p., 2008. Web.
Roach, Dennis P, Walkington, Phil, Rackow, Kirk A, & Hohman, Ed. Rotating concave eddy current probe. United States.
Roach, Dennis P, Walkington, Phil, Rackow, Kirk A, and Hohman, Ed. Tue . "Rotating concave eddy current probe". United States. https://www.osti.gov/servlets/purl/936230.
@article{osti_936230,
title = {Rotating concave eddy current probe},
author = {Roach, Dennis P and Walkington, Phil and Rackow, Kirk A and Hohman, Ed},
abstractNote = {A rotating concave eddy current probe for detecting fatigue cracks hidden from view underneath the head of a raised head fastener, such as a buttonhead-type rivet, used to join together structural skins, such as aluminum aircraft skins. The probe has a recessed concave dimple in its bottom surface that closely conforms to the shape of the raised head. The concave dimple holds the probe in good alignment on top of the rivet while the probe is rotated around the rivet's centerline. One or more magnetic coils are rigidly embedded within the probe's cylindrical body, which is made of a non-conducting material. This design overcomes the inspection impediment associated with widely varying conductivity in fastened joints.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2008},
month = {4}
}

Patent:

Save / Share: