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SYNTHETIC PULSE METHODS FOR ULTRASONIC NONDESTRUCTIVE EVALUATION (NDE)

Award Information

Agency:
Department of Energy
Branch:
N/A
Award ID:
2560
Program Year/Program:
1986 / SBIR
Agency Tracking Number:
2560
Solicitation Year:
N/A
Solicitation Topic Code:
N/A
Solicitation Number:
N/A
Small Business Information
Sigma Research Corp
234 Littleton Rd - Ste 2e Westford, MA 01886
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Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
 
Phase 2
Fiscal Year: 1986
Title: SYNTHETIC PULSE METHODS FOR ULTRASONIC NONDESTRUCTIVE EVALUATION (NDE)
Agency: DOE
Contract: N/A
Award Amount: $379,000.00
 

Abstract:

LARGE-GRAIN MATERIALS ARE DIFFICULT TO INSPECT WITH CONVENTIONAL ULTRASONIC NONDESTRUCTIVE EVALUATION (NDE) METHODS. THIS IS PARTICULARLY TRUE OF THE CEN- TRIFUGALLY CAST STAINLESS STEEL USED FOR COOLANT PIPING IN PRESSURIZED WATER REACTORS (PWR). REDUCED TEST FREQUENCIES MUST BE USED TO PENETRATE THE MATERIAL. HOWEVER, A CORRESPONDING DECREASE IN NEAR-SURFACE RESOLUTION IS INCURRED RESULTING IN A MARGINAL TEST FOR WELD FLAWS. THE PLANNED WORK WILL EVALUATE A POTENTIAL TECHNIQUE FOR COMBINING DEEP PENETRATION WITH EXCELLENT NEAR-SURFACE RESOLUTION. THIS TECHNI- QUE SYNTHESIZES A BROADBAND IMPULSE BY TESTING THE PART WITH A SERIES OF DISCRETE TEST FREQUENCIES. THE FOURIER COEFFICIENTS OF EACH FREQUENCY ARE STACKED TOGETHER TO BUILD A CONTROLLED SPECTRUM. TAKING THE INVERSE FOURIER TRANSFORM RECONSTRUCTS A BROADBAND PULSE THAT SHOULD CONTAIN THE DESIRED FLAW INFORMA- TION. AN OUTSTANDING ADVANTAGE OF THE TECHNIQUE IS THAT THE INDIVIDUAL SPECTRAL COMPONENTS MAY BE AD- JUSTED TO OPTIMIZE THE OUTPUT PULSE.

Principal Investigator:

Mr. T.j. Davis
Principal Investigator
2068811807

Business Contact:

Small Business Information at Submission:

Sigma Research Inc.
8411 154th Ave Ne Redmond, WA 98052

EIN/Tax ID:
DUNS: N/A
Number of Employees: N/A
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No