论文部分内容阅读
针对C/C复合材料中圆周沉积热解碳的消光特性,根据四分之一象限光强法测量原理提出了一种基于灰度曲线极值变化的热解碳消光角计算机测量方法。开发了一种动态模版匹配算法以修正图像采集中产生的目标位置偏移,并通过图像序列纤维截面形状校正解决了纤维倾斜截面的灰度信息提取问题。此方法能够有效地实现C/C复合材料消光角的计算机测量,且同时适用于纤维垂直截面及倾斜截面的情况。测量结果符合四分之一象限光强法的原理,与目测结果之间的误差位于1°～2°以内,随着热解碳内部微观结构原子排列的有序度及热解碳粒子间的夹角增加,消光十字分叉现象愈加明显,偏光图像纹理复杂程度增加,肉眼观测干扰增大,观测值与测量值之间的误差随之增加。
Aiming at the extinction characteristics of pyrolytic carbon in circumferential deposition in C / C composites, a pyrometric carbon extinction angle computer measurement method based on the extremum of grayscale curve was proposed according to the principle of quadrant quadrupole method. A dynamic template matching algorithm was developed to correct the target position offset in image acquisition. The problem of gray information extraction of fiber oblique section was solved by correcting the shape of fiber cross-section in image sequence. This method can effectively measure the extinction angle of C / C composites and is suitable for both the vertical section and the inclined section of the fiber. The results are in accordance with the principle of quadrant quadrupole SP method. The error between the measured results and the visual result lies within 1 ° ~ 2 °. With the orderliness of atomic arrangement of pyrolytic carbon internal microstructure and the difference between pyrolytic carbon particles As the included angle increases, the phenomenon of extinction cross bifurcation becomes more obvious, the complexity of the polarized image texture increases, the interference of the naked eye observation increases, and the error between the observed value and the measured value increases.