Error-compensated multimodal 3D measurement with a high-speed polygon mirror
A multimodal 3D measurement framework based on a high-speed polygon mirror is proposed for integrating area structured-light projection and line laser triangulation scanning within a shared optical architecture. For off-axis polygon-mirror scanning, an optical projection deviation model is established, in which the overall system deviation is explicitly decomposed into Spatial Offset Error (SE) and Intrinsic Nonlinear Error (NE). Based on this model, an angular-domain intensity compensation method is developed for the structured-light mode, while an adaptive variable frequency triggering strategy and a corrected dynamic geometric model are introduced for the line-scanning mode. Full link numerical simulations and ablation studies show that the proposed framework effectively reduces phase distortion, improves sampling uniformity, and suppresses geometric error under the tested conditions. The results further indicate that joint compensation of SE and NE yields improved reconstruction performance in both measurement modes. The proposed method provides a compact and extensible basis for high-speed multimodal 3D measurement using a polygon mirror.