A grid-pattern PSP/TSP system for simultaneous pressure and temperature measurements

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• 作者：Di Peng^a ; ^bAuthor Vitae ; Yingzheng Liu^a ; ^b ; Author Vitae
• 关键词：Pressure-sensitive paint ; Temperature-sensitive paint
• 刊名：Sensors & Actuators: B. Chemical
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：222
• 期：Complete
• 页码：141-150
• 全文大小：4118 K

文摘

A novel combined pressure- and temperature-sensitive paint system has been developed for simultaneous pressure and temperature measurements using a monochrome camera. This grid-pattern PSP/TSP system consists of an array of PSP dots (PtTFPP in polymer-ceramic binder) on top of a TSP layer (Ru(dpp) in clearcoat). The physical separation of PSP and TSP eliminates problems involving chemical interactions and spectral interference which are commonly seen in dual-luminophore PSPs. Both PSP and TSP are excited by a 400 nm LED and the signals are captured simultaneously by a monochrome charged-couple device (CCD) camera. The key challenge is to precisely identify PSP and TSP regions from the grid pattern in each image. This has been realized by first creating a sharp environmental change in temperature or oxygen concentration, and then separating PSP region from TSP region based on the difference in intensity-ratio caused by paint properties. Full pressure and temperature fields are recovered by performing 2-D interpolation on PSP and TSP data, and the temperature field is then used to remove the temperature-induced errors in PSP results. This PSP/TSP system has been demonstrated in oblique jet impingement experiments.