In order to solve the bottleneck problem of high-precision measurement for the gas turbine blade's leading edge

a high-precision measuring device using phase measurement profilometry was designed for the three-dimensional measurement for the metal gas turbine blade's leading edge

based on the calibration accuracy improved by a kind of examining ball array. By the means of designing a multiple view data fusion algorithm and a recursive algorithm of nonlinear least squares

the three-dimensional profile of the blade's leading edge was measured with high precision

and the radii and centers of blade's leading edge from sixteen sections of blade's leading edge were fitted finally. The result shows that the comprehensive error of the blade's leading edge measuring system

methods and algorithms is ±0.03mm. The experimental device and methods are of high efficiency and accuracy

contributing to the progress for blades measurement and modeling techniques.