Optics: measuring and testing – By inspection with agitation or rotation
Patent
1997-05-01
1998-12-29
Font, Frank G.
Optics: measuring and testing
By inspection with agitation or rotation
73147, 73705, G01N 2184, G01M 900, G01L 900
Patent
active
058546820
ABSTRACT:
The present invention provides a new synchronized optical method for measuring surface pressure on rotating objects such as propellers or other rotating objects. The technique is based on the phenomenon of oxygen quenching of luminescence coatings and synchronized optical imaging. A surface coating, referred to as a pressure sensitive paint (PSP), is formed by mixing photo-luminescence molecules in an oxygen permeable polymer. The luminescence excited by an appropriate light source decreases as the oxygen concentration rises due to quenching. As a result, the luminescence intensity of light emitted from the coating varies as a function of the partial pressure of oxygen. A digital camera measures the luminescence intensity distribution over the object and the pressure distribution can be computed.
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Luminescent Barometry in Wind Tunnels, Janet Kavandi, James Callis, Martin Gouterman, Gamal Khalil, Daniel Wright and Edmond Green, Department of Chemistry, BG-10, University of Washington, Seattle, Washington 91895; David Burns, Center for Bioengineering, WD-12, University of Washington, Seattle, Washington, 98195; and Blair McLachlan, NASA-Ames Research Center, Moffett Field, California 94035 (Received 27 Dec. 1989, accepted for publication 28 Mar. 1990) pp. 3340-3347.
Advanced Materials, Phosphorescent Oxygen sensors Utilizing Sulfur-Nitrogen-Phosphorus Polymer Matrices, VCH Verlagsgesellschaft mbH D-69469 Weinheim, 1996 Adv. Mater 1996, 8, No. 9, pp. 768-771.
Font Frank G.
Schumacher Lynn C.
Vierra-Eisenberg Jason D.
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