Novel method and device for double-axis laser scanning

A novel double-axis laser scanning device drives a large-area scanning mirror which is installed on a mechanical amplification mechanism to produce x axis rotation and y axis rotation by utilizing the transformation produced by the inverse piezoelectric effect of a piezoelectric crystal, and a laser pulse is reflected and scanned. The rotation angle movement law of two axes of the scanning mirror is set by a single-chip microcomputer system. An optical fiber displacement sensor and a photoelectricity axial angle encoder are used for respectively measuring the actual rotation angles of the scanning mirror around the x axis and the y axis, and the actual rotation angles are fed back to the single-chip microcomputer system through an A/D chip. In the single-chip microcomputer system, the ideal output rotation angle of the x axis of the scanning mirror is compared with the actual rotation angle of the x axis, wherein the actual rotation of the x axis is fed back. The ideal output rotation angle of the y axis of the scanning mirror is compared with the actual rotation angle of the y axis, wherein the actual rotation angle of the y axis is fed back. The control errors of the rotation angles of the two axes are obtained. Signals for controlling the rotation angle of the x axis and the rotation angle of the y axis of the scanning mirror are produced through the PID control calculation. The control voltage is output through a D/A chip, the voltage is amplified through a direct current voltage amplifier circuit, the amplified voltage is exerted on a piezoelectric crystal set to enable the piezoelectric crystal set to produce the needed transformation, and the scanning mirror rotates by the corresponding angles according to the control demands.