SUPERCONDUCTING ELECTROMAGNETIC SENSOR FOR NONDESTRUCTIVE EVALUATION OF STRESS IN METALS

Award Information
Agency:
Department of Defense
Branch
Army
Amount:
$52,976.00
Award Year:
1988
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
8979
Agency Tracking Number:
8979
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Po Box 1883, La Jolla, CA, 92038
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
DR WALTER N PODNEY
(619) 587-6059
Business Contact:
() -
Research Institution:
n/a
Abstract
WE PROPOSE TO DEVELOP A NON-CONTACTING ELECTROMAGNETIC SYSTEM TO MEASURE RESIDUAL STRESS IN FERROMAGNETIC ARMOR PLATE. WE USE A SUPERCONDUCTIVE (SQUID) MAGNETIC GRADIOMETER IN A NOVEL CONFIGURATION AS THE SENSOR. IT IS COMBINED WITH A MAGNETIZING SOURCE CONSISTING OF A NESTED SET OF SUPERCONDUCTING COILS. THE PROPOSED SYSTEM CAN MEASURE A NUMBER OF MAGNETIC AND ELECTRICAL CHARACTERISTICS SIMULTANEOUSLY. COMBINED MEASUREMENT OF THE PARAMETERS GIVES RESIDUAL STRESS. THE SUPERCONDUCTIVE SYSTEM OFFERS GREAT IMPROVEMENTS IN SENSITIVITY AND SPATIAL RESOLUTION OVER CONVENTIONAL MAGNETIC AND ELECTROMAGNETIC NDE SYSTEMS. FURTHERMORE, ITS UNMATCHED SENSITIVITY AT FREQUENCIES OF FEW HERTZ EXTENDS THE PENETRATION DEPTH BY NEARLY TWO ORDERS OF MAGNITUDE OVER THAT OF CONVENTIONAL SYSTEMS. CONSEQUENTLY, IT PROVIDES A UNIQUE TOOL FOR TESTING THICK ARMOR PLATE. A PROTOTYPE SYSTEM TO BE FABRICATED AND TESTED IN PHASE II WORK USES LIQUID HELIUM TEMPERATURE (4K) SUPERCONDUCTORS. NONETHELESS, THE NEW CLASS OF LIQUID NITROGEN TEMPERATURE (77K) SUPERCONDUCTORS RECENTLY DISCOVERED OFFERS THE PROMISE OF A CONVENIENT AND ECONOMICAL SYSTEM.

* information listed above is at the time of submission.

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