Rapid Method to Measure Turbine Blade Based on Laser Sensor

A novel method was proposed based on laser line-scanning sensor to obtain point clouds of turbine blade. Due to the geometrical invariability, the standard sphere was used as measuring basis. The surface data of blades were measured by four-coordinate measuring machine with line-scanning laser sensor, which can ensure the measuring efficiency of blades and take the control accuracy of the measuring machine into account. Firstly, the point cloud data of the turbine blade were obtained. Then some pre-processing operations, such as error compensation, de-noising and data reduction, were performed before the matching operations. Finally, the Non-Uniform Rational B-Splines curve fitting algorithm was utilized to get the characteristic curve of blade surface. The experimental results indicated that the method can effectively improve the reconstruction accuracy of the blade leading and trailing edge and provide more accurate raw data for the 3D modeling of the blade.