Aircraft Corrosion Inspection by Electromagnetic Induction Spectroscopy

Award Information
Agency:
Department of Defense
Branch
Air Force
Amount:
$97,981.00
Award Year:
2004
Program:
SBIR
Phase:
Phase I
Contract:
FA8501-04-M-0162
Agency Tracking Number:
F041-274-2161
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
GEOPHEX LTD.
605 Mercury Street, Raleigh, NC, 27603
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
148040447
Principal Investigator:
Stephen Norton
Senior Scientist
(919) 839-8515
norton@geophex.com
Business Contact:
Steven Daib
Contract Administrator
(919) 839-8515
daib@geophex.com
Research Institution:
n/a
Abstract
This SBIR Phase I proposal will investigate a new methodology known as electromagnetic induction spectroscopy (EMIS) as a means of detecting and characterizing hidden corrosion in multi-layered airframe structures. This technique, in contrast to traditional single-frequency eddy current methods, records the in-phase and quadrature response of a specimen over a broad range of frequencies. The method then exploits a relationship between the loss of conducting material under the probe and the peak frequency of the quadrature component of the scattered magnetic field. This relationship provides a quantitative measure of the loss (or change) in conducting material under the sensor, which is indicative of corrosion. The proposed EMIS instrument will also incorporate a bucking scheme which eliminates the primary flux linking the sensing coil; this innovation greatly enhances sensitivity and dynamic range compared to conventional impedance-based eddy-current systems. This technique can result in scattered field measurements on the order of parts per million of the source field. The EMIS methodology will be tested in the Phase I effort by performing experimental tests on metallic samples with layers of varying thicknesses and conductivities to simulate metal depletion due to corrosion.

* information listed above is at the time of submission.

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