Method and apparatus for surface pressure mapping of...

G - Physics – 01 – L

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G01L 15/00 (2006.01) G01L 1/24 (2006.01) G01L 11/02 (2006.01) G01M 9/06 (2006.01)

Patent

CA 2204980

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.

La présente invention porte sur une nouvelle méthode optique synchronisée pour mesurer les pressions surfacielles sur des objets tournants comme des hélices ou autres objets du genre. La technique repose sur le phénomène de l'étouffement par l'oxygène des enduits de luminescence et de l'imagerie optique synchronisée. Un enduit de surface, appelé peinture sensible à la pression, est formé en mélangeant des molécules photoluminescentes dans un polymère perméable à l'oxygène. La luminescence excitée par une source lumineuse appropriée décroît à mesure qu'augmente la concentration d'oxygène à cause de l'étouffement. Ainsi, l'intensité de la lumière émise par l'enduit varie en fonction de la pression partielle d'oxygène. Une caméra numérique mesure la répartition de l'intensité de la luminescence sur un objet et c'est ainsi qu'on peut calculer la répartition de la pression.

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