We report a new method of sensing a three-dimensional (3D) object surface with an arbitrary geometric shape. In this approach, the first-order beams diffracted from two acousto-optic deflectors (AODs) interfere with each other to form a spatial carrier that is used to encode the depth information from the 3D object surface. A direct digital synthesizer is utilized to control two AODs to generate sequentially spatial carriers with different spatial frequencies so that a modified temporal phase-unwrapping technique can be applied for decoding the shape information of the test surface. Preliminary experimental results are presented to demonstrate the effectiveness of this method.
© 2005 Optical Society of America
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(150.0150) Machine vision : Machine vision
(150.5670) Machine vision : Range finding
(150.6910) Machine vision : Three-dimensional sensing
Xiang Peng, Jindong Tian, Peng Zhang, Linbin Wei, Wenjie Qiu, Enbang Li, and Dawei Zhang, "Three-dimensional vision with dual acousto-optic deflection encoding," Opt. Lett. 30, 1965-1967 (2005)