Analysis of multiple line-beam structured-light with volume holography

In this study, we propose a compact structured-light three-dimensional (3D) measurement system incorporating a volume holographic optical element (VHOE) to reduce the size and weight of the projection optics. Specifically, we design a cross-shaped diffraction pattern by expanding diffracted beams along orthogonal directions using cylindrical lenses rotated by ±45°. The feasibility of 3D shape reconstruction is experimentally demonstrated through quantitative evaluation using a spherical target. Distance-dependent beam spreading is analyzed using Fourier analysis, and tilted complex-amplitude components are successfully extracted from both static and moving targets. The results demonstrate stable phase extraction under motion, suggesting improved robustness against motion blur compared to the previous one-dimensional line-beam configuration. This approach supports the realization of a lightweight augmented reality (AR) device integrating an AR combiner and an optical pattern generator for embedded 3D scanning.