Mr. Mizue Munekata Profile

Mizue Munekata

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Proceedings Article | 28 January 2019 Paper

A sine-modulated high-intensity UV-LED light source for pressure-sensitive paint applications using fluorescence lifetime imaging technique

Boleslaw Stasicki, Ulrich Henne, Krzysztof Ludwikowski, Mizue Munekata, Daisuke Yorita, Gerhard Holst

Proceedings Volume 11051, 110510C (2019) https://doi.org/10.1117/12.2524599

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The Pressure-Sensitive-Paint (PSP) measurement technique is based on the dependence of the intensity or decay time of its luminescence on the pressure, brought about by oxygen quenching. PSP is usually exited by light of an appropriate wavelength (e.g. UV-light) and its pressure dependent luminescence decay time or lifetime is detected by a camera system (CCD or CMOS). Two basic types of lifetime measurement exist: the first type is a time-domain lifetime method. For this method a pulsed light is used to excite the paint and the pressure dependent time constant is determined from the decay curve of luminescence intensity. The second type is a frequency-domain fluorescence lifetime imaging (FLIM) where sinusoidal modulated light is used to excite the paint and the PSP luminescence is simultaneously detected to calculate its pressure dependent phase shift and amplitude ratio. Based on UV-LEDs a light source has been designed which provides high intensity stable and low distorted sine-modulated light of constant amplitude which is essential for the accuracy of the presented method. The new light source is used to investigate the influence of frequency on pressure sensitivity of a PSP sample to optimize the system for application in transonic wind tunnel tests.

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