Optimization design of multi-sided reflecting prism in laser line scanning imaging system

Multi - faceted reflection prism laser scanning imaging system with scanning speed, scanning Angle and speed stability higher characteristic, is applied to the underwater vehicle short-range detection, rapid imaging of underwater targets can be achieved. In order to study the laser scanning trajectory, three coordinate systems for a prism of a regular polygon were established, and the scanning track length and the coordinates of each scanning point of the reflected laser beam in a scanning period were obtained. The arithmetic model of system scanning efficiency has been established, then analyzed the effect of prism reflector number k, the tilt angle of each side α, ratio of incident beam radius to incident beam position r0/r on scanning efficiency. The influence of prism parameters on scanning width was analyzed and theoretical optimal system parameters were obtained as k=3, α=1.4rad, r0/r=0.005. The research can provide a reference for the design of the multi-face reflection prism in the laser line scanning imaging system.