基于视觉的模型烧蚀形貌实时测量方法

A Vision-Based Method for Real-Time Measurement of Ablative Pattern

针对电弧风洞试验时模型烧蚀形貌实时的变化问题,使用数字散斑相关结合双目视觉的方法直接测量得到了模型烧蚀过程的形貌变化历程。利用散斑相关来进行图像数据的处理,同时综合了亚象素相关算法。通过测量获得了模型烧蚀过程的形貌实时变化情况。标定结果表明标定精度达到了0.02 mm;试验结果表明,测量方法可以为分析平板模型随烧蚀时间变化而变化的特性提供有效的试验数据。

This paper developed a novel method which involved binocular stereo vision to measure the model ablative pattern directly regarding the ablative pattern which was under testing in the arc heated wind tunnel.This method used the speckle correlation to process the data,combined sub-pixel correlation can make the results achieve very high precision.The real planar measuring results was obtained after the test was done on a flat model.The calibrate precision of the measure system is 0.02 mm.The results verified that this method can be useful for the analysis of the model characterize related with ablative time.