Development of Simultaneous Reference- and Signal-Image Acquisition System using Two-Color Unsteady Pressure-Sensitive Paint

研究了一种双色压敏漆（PSP）图像的同时采集方法，以获得包含PSP涂层物体非定常运动的非定常场测量。这包括由参考和信号发光体组成的2色PSP。PSP的参考输出使我们能够获得与压力无关输出相关的参考图像。这用于从PSP输出的信号中提取压力依赖图像。通过同时获取参考图像和信号图像，可以获得包括不稳定运动的全局压力测量。一个快速帧速率的彩色相机被用来同时获取两个图像。双色PSP在520 nm附近提供参考输出，在620 nm附近提供信号。这些对应于相机的绿色和红色图像。通过使用薄层色谱板的多孔支撑基质，开发的PSP可以提供80微秒的快速响应，其特征在于激波管。该系统已应用于颤振测量。

A simultaneous image acquisition method of 2-color pressure-sensitive paint (PSP) was studied for obtaining unsteady field measurement including an unsteady motion of the PSP coated object. This consists of a 2-color PSP composed of the reference and signal luminophores. The reference output from the PSP enables us to obtain the reference image related to the pressure-independent output. This was used to extract the pressure-dependent image from the signal output from the PSP. By acquiring the reference and signal image simultaneously, a global pressure measurement including an unsteady motion can be obtained. A fast-frame rate color camera was used to acquire the two images simultaneously. The two-color PSP provided the reference output around 520 nm, and the signal around 620 nm. These corresponded to the green and red images of the camera. By using a porous supporting matrix of TLC (thin-layer chromatography) plate, the developed PSP could provide a fast response of 80 microsecond characterized by a shock tube. The developed system was applied to a flutter measurement.