NASA 1996 SBIR Phase I


PROPOSAL NUMBER : 96-1 01.09-4908

PROJECT TITLE : : Surface Pressure Measurements Without Wind-Off Correction

TECHNICAL ABSTRACT (LIMIT 200 WORDS)

Dakota Technologies, Inc. (DTI) proposes an innovative technique to measure luminescence lifetime images on test bodies in wind tunnels. The determination of surface pressures via pressure sensitive paint (PSP) technology will be improved and simplified. Incorporation of electro-optic shutters into the apparatus will provide the essential time-domain information at a fraction of the cost associated with pulsed excitation sources and intensified charge-coupled device (CCD) cameras. There will no longer be a need for the "wind-off" measurement and accompanying extensive calculations to account for model movement and distortion between the "wind-on" and "wind-off" conditions. The effects that non-uniform illumination of the body under test, response variation across the detector array, photodegradation of the paint, and surface contamination by oil and dirt, have on the results will be minimized. The new instrumentation maintains compatability with the NASA-Langley approach to an internal reference luminophore. The most important Phase I technical objective is to demonstrate that luminescence lifetimes in the appropriate range for pressure sensitive paints can be measured precisely and accurately with the new instrumentation. Data processing algorithms will be written and tested to meet this objective.
POTENTIAL COMMERCIAL APPLICATIONS
Success in eliminating wind-off correction will clear the way for standard instrumentation in all wind tunnels. The defense-related applications fall into three categories: 1) aircraft models; 2) turbines and rotors; 3) missiles and ballistic objects. Aside from obvious civilian aviation applications, there is an extremely wide range of potential commercial uses, the automotive industry being one of the most important.
NAME AND ADDRESS OF PRINCIPAL INVESTIGATOR
Gregory D. Gillispie
Dakota Technologies, Inc.
2201A 12th Street North
Fargo, ND 58102

NAME AND ADDRESS OF OFFEROR

Dakota Technologies, Inc.
2201A 12th Street North
Fargo, ND 58102