Scanning device with waveform generator optimizer
AssigneeNational Research Council of Canada/Conseil National de Recherches du Canada
InventorFrancois Blais
Life of this patent
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Abstract
A scanning device has a drive system to angularly reciprocate a rotatable mirror about an axis in a desired waveform in accordance with an excitation signal supplied by a programmable waveform generator. A position sensor generated as signal representing the actual waveform of reciprocation of the mirror, and a microprocessor determines a signal representing the error between the actual waveform and the desired waveform. The microprocessor includes a waveform optimizer that receives this error signal and delivers an excitation correction signal to the waveform generator to adjust the excitation signal from the waveform generator to cause the mirror to have an actual waveform substantially in accordance with the desired waveform.
Claims8
A scanning device having a drive system to angularly reciprocate a rotatable element about an axis in a desired waveform, reference means defining said desired waveform, a programmable waveform generator for supplying an excitation signal to the drive system in accordance with said desired waveform, a position sensor for generating a signal representing the actual waveform of reciprocation of the rotatable element, and a microprocessor having
- (a) means for determining an actual error signal representing an error between the actual waveform as determined by the position sensor and the desired waveform as determined by the reference means,
- (b) means for generating a model of the scanning device for generating an attempted error signal, and
- (c) a waveform optimizer for receiving said actual error signal and for delivering an excitation correction signal to the waveform generator to adjust the excitation signal from the waveform generator to cause the rotatable element to have an actual waveform substantially in accordance with the desired waveform.
A scanning device having a drive system to angularly reciprocate a rotatable element about an axis in a desired waveform, reference means defining said desired waveform, a programmable waveform generator for supplying an excitation signal to the drive system in accordance with said desired waveform, a position sensor for generating a signal representing the actual waveform of reciprocation of the rotatable element, and a microprocessor having
- (a) means for determining an actual error signal representing an error between the actual waveform as determined by the position sensor and the desired waveform as determined by the reference means,
- (b) means for generating a model of the scanning device for generating an attempted error signal, and
- (c) a waveform optimizer for receiving said actual error signal and comprising means for obtaining a difference between the attempted error signal and the actual error signal to generate a signal representing an imperfection in the actual error signal, means receiving said imperfection signal for generating an estimate of the excitation error and for delivering an excitation correction signal to the waveform generator to adjust the excitation signal from the waveform generator to cause the rotatable element to have an actual waveform substantially in accordance with the desired waveform.
Dependencies are inferred from the claim text.