Application of luminescent coatings for surface pressure measurements.

Basu, Bharathibai J and Anandan, C and Rajam, KS (2004) Application of luminescent coatings for surface pressure measurements. In: International Conference on Advances in Surface Treatment: Research and Applications, ASTRA,, Nov 3-6 2003, Hyderabad, India.

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In recent times, certain luminescent coatings, more popularly known as pressure sensitive paints (PSP) are increasingly used for the measurement of surface pressure distribution on wind tunnel models. This PSP technique is based on the dynamic quenching of the luminescence of certain compounds by oxygen molecules. The PSP coating consists of luminescent sensor molecules embedded in a transparent oxygen-permeable polymer support. When the coating is illuminated with light at an appropriate wavelength, it emits luminescence. The intensity of the luminescent emission is inversely proportional to the local surface pressure. Since the partial pressure of oxygen in air is nearly constant, the coating is sensitive to changes in air pressure on its surface. Both organic and inorganic luminescent sensors are reported in literature. In Surface Engineering Division at NAL, we have been pursuing the development of luminescent pressure sensitive paints suitable for application in NAL PSP System. Systematic investigations were carried out to develop PSP formulations using pyrene and its derivatives as sensors. The photophysical characteristics of the coatings developed were evaluated and the results are described here. Copyright amp;copy; 2004 by Society for Advancement of Heat Treatment and Surface Engineering (SAHTSE).13;

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Coatings;Luminescence;Surface properties;Paint;Quenching;Air
Subjects: ENGINEERING > Structural Mechanics
Depositing User: MS Jayashree S
Date Deposited: 27 Apr 2007
Last Modified: 24 May 2010 04:25

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