应用锥光偏振全息技术的航空叶片测量新方法

A New Method of Aviation Blade Measurement via Applications of Conoscopic Holography Principle

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 the complex shape and large curvature variation of the aviation blade profile, this paper proposed a new measurement method via application of conoscopic holographic principle. This method used the same beam conoscopic lighting, and allowed the variation ranges of the angles between normal direction of the surfaces to be measured and optical axis to he lar- ger, so as to avoid the influences of blade curvature on the measurements. Then, the proposed data registration algorithm based on implicit polynomials which may match measurement data with CAD model data, may be used to obtain blade surface error distribution and the deviations of geometric pa- rameters, and provide accurate parameters for the adjustment of processing parameters. Experimental results show that measuring repeatability of the method is less than 8 ~m, which meets the measure- ment requirements of aviation blades for the adaptive machining.