Video luminescent barometry - The induction periodVideo monitoring of oxygen quenching of the photoluminescence of platinum octaethylporphyrin (PtOEP) in silicone polymer resin may be used to measure pressure distribution over an airfoil. A continuous increase of the luminescence intensity of PtOEP on exposure to the exciting light is known as the induction effect. The effect of several factors on PtOEP photoluminescence and the induction effect was investigated. The experimental apparatus is described and results are presented. It was observed that the relative induction amplitude and induction time increase at higher oxygen pressure and with thicker films. These observations may be explained if the singlet oxygen produced by oxygen quenching is consumed by the polymer and is therefore unavailable for further quenching. Researchers using this method for measuring pressure distribution on airfoil surfaces should be aware of the induction effect and its implications.
Document ID
19930038610
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Uibel, Rory H. (NASA Ames Research Center Moffett Field, CA, United States)
Khalil, Gamal (NASA Ames Research Center Moffett Field, CA, United States)
Gouterman, Martin (NASA Ames Research Center Moffett Field, CA, United States)
Gallery, Jean (NASA Ames Research Center Moffett Field, CA, United States)
Callis, James B. (Washington Univ. Seattle, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Subject Category
Instrumentation And Photography
Report/Patent Number
AIAA PAPER 93-0179
Meeting Information
Meeting: AIAA, Aerospace Sciences Meeting and Exhibit