The research of a novel single mirror 2D laser scanner

A single mirror 2D laser scanner is designed, produced and tested in the paper. The mirror of the scanner is suspended on a compact cross blade flexure and driven by four voice coil actuators. The voice coil actuators designed specially can output strong driving force and have sufficient large gap for mirror's deflection. An in-house ingenious deflection angle detecting system based on a 2D position sensitive detector provides feedback to enable two-axis closed-loop scanning. Details of the voice coil actuators design, the mechanical structure design and deflection angle detecting system as well as the control-loop implementation are described. Test results shows that the mechanical deflection angles in both azimuth and elevation are about ±5°, and the closed-loop bandwidth is 350Hz. The diameter of the mirror is 40mm, and the diameter of laser beam can reach 35mm when mechanical scanning angle is 5°. A 2D scanning is realized by the scanner deflecting in two orthogonal axes. The vertical scanning frequency is 10Hz, and the scanning wave is triangle wave. At the same time, the horizontal scanning frequency is 80Hz, and the scanning wave is sine wave.