Structural design of microscopic 3D measurement system based on dual-telecentric optical path

摘要

Most of the traditional microscopic systems arc based on the structural design of a single telecentric camera combined with a single projector. The projector in such system needs to be accurately calibrated as an additional view to complete the 3D measurement with the camera. However, it, is difficult to achieve high-accuracy calibration due to problems such as gamma, lens distortion, and additional lenses that are difficult to accurately align. In this work, we present a structural design of microscopic 3D measurement system based on dual-telecentric optical path, which contains two camera that can be accurately calibrated and a projection light path. Our design can make full use of the advantages of the full-field structured light projection and is convenient to calibrate. Two different perspectives can provide 3D data from different depth and multiple angles simultaneously so that measurement volume can be enlarged by superimposing the data.