国产欧美精品一区二区,中文字幕专区在线亚洲,国产精品美女网站在线观看,艾秋果冻传媒2021精品,在线免费一区二区,久久久久久青草大香综合精品,日韩美aaa特级毛片,欧美成人精品午夜免费影视

Pressure sensitive paint measurement technology has the advantages of non-contact, full range measurement, widely used in model surface pressure distribution measurement. Pressure sensitive paint test using continuous acquisition of multiple images and calculating the average image to reduce the noise, the number of the images is generally determined by experience. Scientific CCD camera’s noise type was analyzed, come to the collusion that the PSP measurement system’s main noise source is the CCD’ s optical scattering noise which could be reduced by averaging the images. A calculation method of image’s signal-to-noise ratio based on sub region is proposed, and the results of different average number of PSP test images of airfoil and delta wing model are compared and analyzed. The results show that the signal-to-noise ratio tends to converge when the average number of images is increased to a certain value, and the result can still meet the accuracy requirements of PSP pressure test when the average number halved. The required number of images could be determined by analyzing the signal-to-noise, and the test time could be controlled reasonable.