一种基于立体视觉技术的燃烧诊断方法

A New Combustion Diagnostic Method Based on Stereo Vision Technology

关键词:  双目立体视觉  三维重建  火焰面  流场显示

Key words:  Binocular stereo vision  Three-dimensional reconstruction  Flame surface  Flow visualization

摘要:

为了获得一种简便、易于操作的三维光学诊断方法，将双目立体视觉技术引入燃烧诊断领域，并验证了其在燃烧诊断领域应用的可行性。搭建了用于燃烧流场诊断的高速双目立体视觉系统，阐明了双目立体视觉原理并开发了配套软件，通过对标定模板上特征点进行三维重建验证了系统和软件的可用性，对特征点三维重建的绝对误差为0.17mm，相对误差为8%。实现了对非预混冲击火焰表面的三维重建，重建后的三维图像可以清晰地显示出火焰表面的三维几何结构。对一组连续拍摄的图像进行处理，得到火焰在微小时间间隔中的空间演变情况。实验结果表明，利用该技术可以实现对燃烧火焰的三维诊断，利用该技术进行的实验操作相对于其他的光学诊断方法而言也非常简单。

Abstract:

In order to obtain a new three-dimensional optical combustion diagnostic method which is simple and easy to operate，binocular stereo vision technology was introduced into combustion diagnostic field，and the feasibility of the method was demonstrated. High-speed binocular stereo vision system for the diagnostic of combustion field was built and the principle of binocular stereo vision was clarified. Software was developed and tested. Three-dimensional reconstruction of feature points in the calibration panel was carried out. The absolute error of the result was 0.17mm and the relative error was 8%. The three-dimensional reconstruction of diffusion impinging flame was obtained and the three-dimensional structure of flame was shown clearly in the reconstruction image. The development of three-dimensional flame in a short interval was obtained by dealing with a series images of flame . It is shown that the new technology could be used in combustion diagnostic field and the operation of experiment is much more easier than other optical methods.