A MINIATURE SEPARATION SENSOR FOR WIND TUNNEL MODELS

Award Information
Agency:
Department of Defense
Branch
Air Force
Amount:
$49,910.00
Award Year:
1991
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
14985
Agency Tracking Number:
14985
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
66 Cherry Hill Drive, Beverly, MA, 01915
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Michael Hercher
Principal Investigator
(508) 921-2100
Business Contact:
() -
Research Institute:
n/a
Abstract
THIS PROPOSAL DESCRIBES A NON-CONTACTING SENSOR FOR MEASURING THE DISTANCE BETWEEN ARTICLES LOCATED IN A HYPERSONIC WIND TUNNEL. THE SENSOR SIZE IS 5-INCHES LONG X 0.1-INCH DIAMETER AND ITS RESOLUTION IS 0.002 -INCH. THE BASIC PRINCIPLE USED IS PHASE SENSITIVE OPTICAL RADAR: A LASER DIODE IS MODULATED AT 1000 MHZ AND LASER RADIATION REFLECTED FROM A TARGET OBJECT IS DETECTED. THE PHASE OF THE DETECTED MODULATION IS A LINEAR FUNCTION OF THE DISTANCE BETWEEN THE SENSOR AND THE REFLECT ING TARGET-ONE CYCLE OF PHASE FOR EACH 5.9-INCHES OF SEPARATION. OPTRA HAS DEVELOPED A ROBUST TECHNIQUE (HARDWARE + FAST ALGORITHMS) FOR MAKING SUCH PHASE MEASUREMENTS WITH A RESOLUTION OF 1/3000-CYCLE, OR DISTANCE RESOLUTION OF 0.002-INCH. IT IS PROPOSED TO USE OPTICAL FIBERS TO LINK THE SENSOR PROBE TO THE DATA-PROCESSING MODULE, SO THAT THE PROBE WILL CONTAIN ONLY PASSIVE ELEMENTS AND CAN BE MADE TO WITHSTAND HIGH TEMPERATURES. THE SPECIFIED RANGE OF THE PROBE IS 0 TO 1-INCH, ALTHOUGH WE EXPECT TO BE ABLE TO ACHIEVE A WORKING RANGE OF AT LEAST 0 TO 2-INCHES. IN ADDITION TO ITS UTILITY IN WIND-TUNNEL MEASUREMENTS, OPTRA EXPECTS THAT SUCH A SENSOR WILL FIND WIDE APPLICATION AS AN INDUSTRIAL SENSOR, PARTICULARLY IN PROCESS AND MANUFACTURING CONTROL APPLICATIONS.

* information listed above is at the time of submission.

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