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NDE OF INTERFACIAL BONDS BY MICRO-SCANNING GAMMA BACKSCATTERING

Award Information

Agency:
Department of Defense
Branch:
Army
Award ID:
12994
Program Year/Program:
1990 / SBIR
Agency Tracking Number:
12994
Solicitation Year:
N/A
Solicitation Topic Code:
N/A
Solicitation Number:
N/A
Small Business Information
SPIRE CORPORATION
1 PATRIOTS PARK BEDFORD, MA 01730-2396
View profile »
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
 
Phase 1
Fiscal Year: 1990
Title: NDE OF INTERFACIAL BONDS BY MICRO-SCANNING GAMMA BACKSCATTERING
Agency / Branch: DOD / ARMY
Contract: N/A
Award Amount: $49,849.00
 

Abstract:

ADHESIVELY BONDED STRUCTURAL MATERIALS REQUIRE NONDESTRUCTIVE METHODS OF INSPECTION AND EVALUATION (NDI/E) TO DETECT CRACKS, VOIDS, AND INCLUSIONS WHICH DIRECTLY AFFECT BOND STRENGTH. LACK OF RELIABLE NDI/E, PARTICULARLY DURING MANUFACTURE, WILL FORCE RELIANCE ON LARGE DESIGN MARGINS OF SAFETY AND EXPENSIVE DESTRUCTIVE TESTING. PHASE I WILL ADDRESS THESE NEEDS WITH GAMMA-RAY BACKSCATTER RADIOMETRY USING A COLLIMATED DETECTOR TO ACHIEVE NEAR MICROSCOPIC RESOLUTION. THIS IS SIMILAR TO BACKSCATTER TOMOGRAPHY (BOTH REQUIRE ACCESS TO A SINGLE SURFACE), BUT INSTEAD OF CREATING AN INTEGRATED IMAGE, INTERSECTING DETECTOR AND SOURCE VIEWS MEASURE DENSITY IN ONE PIXEL AT A TIME. FINER RESOLUTION IS ACHIEVED USING STACKS OF CONVERGING PLANAR VANES OR OTHER CONFIGURATIONS TO FOCUS THE VIEW TO A SMALL REGION. INSPECTION WOULD SCAN THIS REGION AT VARIOUS DEPTHS BELOW THE SURFACE OR COULD MAP A LARGER VOLUME AND THUS ENABLE DETAILED IMAGING. RECENT APPLICATIONS TO COMPOSITES SUGGET IT SHOULD BE POSIBLE TO ADJUST THE SENSITIVE VOLUME TO LESS THAN 1 MM(3), ENABLING DETECTION OF DEFECT SIZES ON THE ORDER OF A FEW MICROMETERS. PHASE I WILL DETERMINE FEASIBILITY OF SUCH MICROSCOPIC SCANNING IN REPRESENTATIVE COMPOSITE MATERIALS. PENDING THE OUTCOME OF THESE TESTS, A PROTOTYPE INSPECTION SYSTEM WILL BE DEVELOPED IN PHASE II AND CALIBRATED WITH APPROPRIATE DESTRUCTIVE TESTS.

Principal Investigator:

Dr Charles C Blatchley
6172756000

Business Contact:

Small Business Information at Submission:

Spire Corp
Patriots Pk Bedford, MA 01730

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