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Oxygen Quenching of Luminescence of Pressure Sensitive Paint for Wind Tunnel Research
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Abstract
A technique for measuring the lift on airfoils in wind tunnels has been developed based on oxygen quenching of luminescence. A luminophor that is quenched by oxygen is dissolved in a paint containing polymer that is oxygen permeable and a volatile solvent. The paint is sprayed to form a coating on the airfoil surface. The intensity of photo excited emission depends on the effective oxygen pressure over the surface. During airflow this is reduced and the emission gets brighter. The ratio of a CCD camera image of the emission intensity taken in still air to that taken during airflow provides a map of the pressure on the airfoil surface. This is given by the Stern-Volmer equation: Io(x,y)/I(x,y) = A + B(pxy/po) where Io(x,y) is the intensity measured at point x,y in still air at pressure po, I(x,y) is the intensity at the same point during airflow, pxy is the pressure at that point during airflow, and A and B are calibration constants. The luminophor of choice was a platinum porphyrin that is excited in the near uv and emits a phosphorescence at 650 nm. The most serious problem with the method is that the emission intensity is also temperature dependent.
Keywords (Audience):
Upper-Division UndergraduateKeywords (Domain):
Inorganic ChemistryKeywords (Feature):
Symposium ReportKeywords (Subject):
OxygenCiting Articles
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This article has been cited by 19 ACS Journal articles (5 most recent appear below).
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Principal Component Analysis Calibration Method for Dual-Luminophore Oxygen and Temperature Sensor Films: Application to Luminescence Imaging
Muhammet Erkan Köse, Ahmed Omar, Christopher A. Virgin, Bruce F. Carroll, and Kirk S. SchanzeLangmuir2005 21 (20), 9110-9120Principal Component Analysis Calibration Method for Dual-Luminophore Oxygen and Temperature Sensor Films: Application to Luminescence Imaging
Muhammet Erkan Köse, Ahmed Omar, Christopher A. Virgin, Bruce F. Carroll, and Kirk S. SchanzeLangmuir2005 21 (20), 9110-9120Oxygen sensor films are frequently used to image air-pressure distributions on surfaces in aerodynamic wind tunnels. In this application, the sensor film is referred to as a pressure-sensitive paint (PSP). A SternVolmer calibration is used to relate the ...
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- Received: August 03, 2009
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