Abstract
A novel pressure-sensitive paint (PSP) system has been developed which uses an embedded organic light-emitting diode (OLED) layer as excitation, and thus eliminates the usual requirement of an external light source. This system consists of an OLED layer, an optical filter layer and a polymer-ceramic (PC) PSP layer with fast response. The OLED provides green excitation light (around 500 nm) for PSP, while the optical filter and (550 nm short-pass) removes unwanted longer wavelength light to prevent possible interference with the PSP signal. A PC-PSP layer is applied on top of the filter with well-controlled basecoat thickness (~ 10 μm) to allow sufficient light transmittance. It is also important that the OLED is modulated with a limited duty cycle and synchronized with the camera exposure to minimize uncertainties mostly due to the inherent heating effect of OLED. This OLED-based PSP has a pressure sensitivity comparable to the regular PC-PSP, and it is well-suited for pressure measurements on moving surfaces since its illumination field is independent of the model motion. Its advantage over a conventional PSP system was demonstrated through applications on a flapping plate under the impingement of a nitrogen jet.
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Acknowledgements
This work was supported by National Natural Science Foundation of China (NSFC Nos. 11502144 and 11725209), the young faculty startup fund from Shanghai Jiao Tong University and funding from Gas Turbine Research Institute of Shanghai Jiao Tong University.
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Peng, D., Chen, J., Yu, Y. et al. A novel laminated OLED–PSP system for measurement on moving surfaces. J Vis 21, 215–223 (2018). https://doi.org/10.1007/s12650-017-0458-y
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DOI: https://doi.org/10.1007/s12650-017-0458-y