Development Of 3D Measuring Equipment Based On Active Structured Light

In the field of civil aviation manufacturing and maintenance,the original data of aircraft parts and components are kept secret to the outside world.Under the condition of limited manufacturing technology in China,reverse engineering has become a breakthrough in researching advanced aviation manufacturing technology.Through reverse reconstruction technique(measuring technology and measurement equipment)aviation parts entity model can be converted to digital model,for the domestic aviation manufacturing and processing,maintenance technology is of great importance,and the measuring technique and its derivatives in the reverse reconstruction technique(equipment)has always been the hot spot of the industry research,especially a kind of suitable for research in the field of aviation equipment.In the reverse reconstruction technology,the technology of obtaining shape data and the technology of surface reconstruction are the two key links to realize the threedimensional reconstruction.In this paper,the idea of reverse engineering is adopted,and the research on the construction of three-dimensional measurement equipment is completed based on the principle of Fourier profilometry to obtain shape information.The 3D measurement equipment is composed of software and hardware.The hardware part is composed of a camera,a projection device,a stepping motor and an Arduino microcontroller.The software part is based on the Qt program framework using C++ to call the SDK software development kit to complete the call to the camera and projection,and The three-dimensional measurement algorithm is packaged into a software upper computer,and the overall equipment is realized by the upper computer controlling the lower computer.The sine fringe is projected on the surface of the object through the projection device,and the image acquisition equipment obtains the deformed fringe of the target object,and performs fast Fourier transform,filtering and inverse Fourier transform on the information of the deformed fringe to solve the height distribution information of the measured object surface,And complete the overall shape data collection through multiple different angle measurements;through point cloud stitching(rough stitching and precise stitching),combined with ICP algorithm to achieve fullangle high-precision modeling of the target object.The equipment is used for dynamic measurement of aero engine blades and static measurement of two aerospace components with different complexity and modeling.The single-sided accuracy assessment of equipment through the mean square error method can be used as an important tool for research in the field of aviation parts.