Guo Yangkuan

Signal Tap-II Based Debugging Approach for the Data Acquisition System of Multi-joint Coordinate Measuring Machine

Data Acquisition System (DAS) is one of the key components of Multi-joint Coordinate Measuring Machine (MCMM) that affects the latters performance during practical usage. This article reports a SignalTap-II based debugging approach for the DAS of MCMM. Both the work principle and work process are illustrated. SignalTap-II online logic analyzer is employed to analyze and return real-time collected data to a personal computer (PC). Particular experimental results are provided in diagrams, indicating that the SignalTap-II based DAS debug approach is capable of monitoring the data acquisition process in real-time, reducing the time period for debug and verification, and shortening production cycle.)

Tight focusing of axially symmetric polarized vortex beams

Tight focusing of axially symmetric polarized vortex beams is studied numerically based on vector diffraction theory. The mathematical expressions for the focused fields are derived. Simulation results show that the focused fields and phase distributions at focus are largely influenced by both the polarization order and topological charge of the incident beams. Moreover, focal spots with flat-topped or tightly-focused patterns can be flexibly achieved by carefully choosing the polarization order and the topological charge, which confirms the potential of such beams in wide applications, such as optical tweezers, laser printing, lithography, and material processing.