COMBINING LASER MEASUREMENTS WITH BACKWARD WAVE TECHNIQUES FOR EVALUATION OF UNDERGROUND OPENINGS IN OIL SHALE

Award Information
Agency:
Nuclear Regulatory Commission
Branch
n/a
Amount:
$249,949.00
Award Year:
1984
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Agency Tracking Number:
296
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Sigma Research, Inc.
3200 George Washington, Richland, WA, 98188
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Gerald L. Fitzpatrick
() -
Business Contact:
() -
Research Institution:
n/a
Abstract
SUCCESSFUL COMMERCIALIZATION OF OIL SHALE WILL INVOLVE LARGESCALE UNDERGROUND MINING OR RETORTING, AND WILL REQUIRE SUPPORT TECHNOLOGY TO EVALUATE THE INTEGRITY OF SUPPORT PILLARS, MINE ROOF ROCK, AND OTHER LARGE STRUCTURES IN OIL SHALE. IN ORDER TO ELIMINATE TIME CONSUMING AND OBTRUSIVE EVALUATION METHODS INVOLVING CONTRACT TYPE DETECTORS (GEOPHONES, ACCELEROMETERS, ETC.), IT IS PROPOSED HERE THAT OIL SHALE STRUCTURES BE EVALUATED BY NONCONTRACT OPTICAL METHODS. IN PARTICULAR, WE PROPOSE THAT THE RESPONSE OF ROCK STRUCTURES TO VARIOUS TYPES OF ACOUSTIC EXCITATION BE MEASURED AND RECORDED USING A LASER AND OPTICAL INTERFEROMETRIC TECHNIQUES. ONCE THESE ARRAY MEASUREMENT TECHNIQUES ARE FULLY DEVELOPED, WE FURTHER PROPOSE THAT OPTICALLY GATHERED ACOUSTIC DATA BE PROCESSED BY "BACKWARD WAVE PROPAGATION" TECHNIQUES. THESE TECHNIQUES WILL ALLOW US TO DETERMINE THE STATE (STRESS FIELD, CAVITIES, INCLUSIONS, ZONES OF FRACTURED ROCK, ETC.) OF THE ROCK VOLUME ADJACENT TO THE ROCK SURFACE BEING EXAMINED OPTICALLY. THIS DEMONSTRATED CAPABILITY WOULD LEAD TO THE DEVELOPMENT OF RAPID, INEXPENSIVE TOOLS FOR THE EVALUATION OF LARGE STRUCTURES IN ANY KIND OF ROCK, AND IN PARTICULAR, LEAD TO PRACTICAL EVALUATION METHODS FOR LARGE UNDERGROUND STRUCTURES IN OIL SHALE. THE INCREASED SAVINGS IN TIME AND MONEY AND THE ENHANCED SAFETY TO PERSONNEL WOULD MORE THAN OFFSET THE COST OF DEVELOPMENT.

* information listed above is at the time of submission.

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