A MULTI-POINT ARRAY LASER DOPPLER VELOCIMETER

Award Information
Agency:
National Science Foundation
Branch
n/a
Amount:
$299,933.00
Award Year:
1995
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Award Id:
27392
Agency Tracking Number:
27392
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Northwest Research Assoc Inc. (Currently NorthWest Research Associates, Inc.)
300 120th Ave Ne Bldg 7 #220, Po Box 3027, Bellevue, WA, 98009
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Yogesh C Agrawal
(206) 453-9141
Business Contact:
() -
Research Institution:
n/a
Abstract
RESEARCHERS ARE DEVELOPING A MULTI-POINT LASER VELOCIMETER TO OBTAIN VELOCITIES AT A NUMBER OF POINTS, SIMULTANEOUSLY AND NON-INTRUSIVELY. THIS INSTRUMENTATION IS TO BE APPLIED TO TRANSPORT AND EXCHANGE IN SURFACE AND BOTTOM BOUNDARY LAYERS. HOWEVER, THE TECHNIQUE WILL BE APPLICABLE TO A WIDE RANGE OF FLOWS WHERE SIMULTANEOUS VELOCITY MEASUREMENTS ARE DESIRABLE. AT THE HEART OF THE INNOVATION IS A COMPLETELY NON-INTRUSIVE OPTICAL GEOMETRY THAT FORMS SEVERAL SAMPLE VOLUMES IN THE FLOW AND CORRESPONDING RECEIVING OPTICS TO DISTINGUISH THEIR IMAGES. SUCH A DEVICE IS NEEDED TO OBSERVE STRUCTURES IN NATURAL FLOWS AND TO DEAL WITH ISSUES SUCH AS FLOW STATIONARITY. THIS SIMULTANEOUS VIEW OF THE VELOCITY FIELD WILL REMOVE UNCERTAINTY IN THE INTERPRETATION OF VELOCITY PROFILE INFORMATION; E.G., THE VELOCITY SHEAR AND SHEAR STRESS, TURBULENT CHARACTERISTIC SCALES, AND ROUGHNESS LENGTHS. THE CONCEPT ALSO REMOVES THE NEED FOR MECHANICAL SCANNING DEVICES OR PROFILERS, BOTH OF WHICH YIELD NON-SIMULTANEOUS MEASUREMENTS. THE USE OF THIS INSTRUMENT FOR CHARACTERIZING THE CONCENTRATION AND TRANSPORT RATE OF SEDIMENTS IN THE BOTTOM BOUNDARY LAYER IS DESCRIBED. THE CONCEPT IS ALSO BENEFICIAL TO LABORATORY SCIENTISTS USING FLUMES, TOWING TANKS, OR WIND TUNNELS, IN THAT MULTI-POINT MEASUREMENTS PROVIDE ADDITIONAL INFORMATION ON FLOW STRUCTURE AND IMPROVE PRODUCTIVITY.

* information listed above is at the time of submission.

Agency Micro-sites


SBA logo

Department of Agriculture logo

Department of Commerce logo

Department of Defense logo

Department of Education logo

Department of Energy logo

Department of Health and Human Services logo

Department of Homeland Security logo

Department of Transportation logo

Enviromental Protection Agency logo

National Aeronautics and Space Administration logo

National Science Foundation logo
US Flag An Official Website of the United States Government