Scanning system and method of operation using wide band scanning elements for generating arbitrary rotatable multi-dimensional scanning patterns in portable or fixed scanning modes

摘要

A scanning system is capable of open or closed loop operation for generating arbitrary rotatable multi-dimension with frequency compensation of scanning element. The system includes at least two scan elements positioned substantially orthogonally to each other for generating the arbitrary rotatable multi-dimensional scanning patterns. A power supply is responsive to respective control signals from a set of drive waveforms as inputs to the at least two scan elements. A controller includes an information processing system to store in digital form the desired set of arbitrary rotatable multi-dimensional scan patterns. In a closed loop mode, the controller stores feedback parameters for each scan element with a particular rotational angle and a feedback value at a particular frequency. The controller uses a feedback signal from the scan elements to compute an error signal indicative of the difference in frequency response between the desired frequency response and the actual frequency response and the difference in phase between the scanning elements. The error signal adjusts the control signal provided to the power supply to conform the actual and desired frequency response of the scanning elements thereby substantially eliminating distortion in pattern generation. In an open loop mode, the scanning system is operated without a feedback signal, but the drive waveforms are regularly fine tuned in amplitude and phase to compensate for changes in frequency response due to temperature variations and aging of the scanning elements.