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针对航空叶片型面复杂、曲率变化大的特点,提出一种应用锥光偏振全息原理的测量方法,该方法采用同一束锥光照明,允许被测表面的法向方向与光轴的夹角有较大的变动范围,从而避免叶片曲率变化对测量的影响。在此基础上,利用提出的基于隐式多项式的数据配准算法实现测量数据与CAD模型数据的同位姿化,获得叶片型面误差分布及相关几何参数的偏差,为加工工艺参数的调整提供精确的参数。实验结果表明,该方法测量重复性小于8μm,达到航空叶片自适应加工对测量的要求。
Aiming at the characteristics of complicated aerofoil profile and large curvature variation, a method of measuring the holographic principle of cone polarization is proposed. The method uses the same beam of cone illumination to allow the angle between the normal direction of the measured surface and the optical axis to be A larger range of variation, thus avoiding the blade curvature changes on the measurement. On this basis, the proposed algorithm based on implicit polynomial registration algorithm is used to achieve the alignment of the measured data and the CAD model data, and the error of the blade surface profile and the deviation of the relevant geometric parameters are obtained, providing accurate adjustment of the processing parameters The parameters. The experimental results show that the method can measure the repeatability less than 8μm, and meet the requirements of aeronautic blade adaptive processing.