STEPPED FREQUENCY ULTRASONIC HOLOGRAPHY FOR FLAW CHARACT.

Award Information
Agency:
Department of Energy
Amount:
$455,638.00
Program:
SBIR
Contract:
N/A
Solitcitation Year:
N/A
Solicitation Number:
N/A
Branch:
N/A
Award Year:
1984
Phase:
Phase II
Agency Tracking Number:
401
Solicitation Topic Code:
N/A
Small Business Information
Sigma Research, Inc.
565 Industry Drive, Seattle, WA, 98188
Hubzone Owned:
N
Woman Owned:
N
Socially and Economically Disadvantaged:
N
Duns:
N/A
Principal Investigator
 B.p. Hidelbrand
 () -
Business Contact
Phone: () -
Research Institution
N/A
Abstract
ULTRASONIC IMAGING SYSTEMS OF VARIOUS TYPES ARE PRESENTLY UNDER DEVELOPMENT FOR NONDESTRUCTIVE TESTING. ALL OF THEM REQUIRE A TWO-DIMENSIONAL APERTURE TO BE SCANNED BY A TRANSDUCER, OR FILLED WITH MULTIPLE TRANSDUCERS. A PARTICULARLY INTERESTING SYSTEM IS ONE BASED ON HOLOGRAPHIC PRINCIPLES. IN MANY REACTOR LOCATIONS IT IS VERY DIFFICULT TO IMPLEMENT EITHER A SCANNER OR A LARGE ARRAY OF TRANSDUCERS. RECENT WORK HAS SHOWN THAT UNDER SOME CIRCUMSTANCES IT IS POSSIBLE TO USE FREQUENCY SWEEPING TO GENERATE A SYNTHETIC APERTURE IN ONE DIMENSION. THIS ALLOWSA SINGLE DIMENSIONAL CROSS-SECTIONAL IMAGE TO BE MADE FROM ONE FIXED TRANSDUCER, OR A TWO-DIMENSIONAL IMAGE FROM A LINE ARRAY OF TRANSDUCERS. IN THIS RESEARCH, WE WILL ADAPT THE SWEPT FREQUENCY METHOD TO OUR STANDARD HOLOGRAPHIC SYSTEM TO ACHIEVE THIS TYPE OF IMAGING.

* information listed above is at the time of submission.

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