Laser Scan Mirror Timing Control Under Vibration Disturbance
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Solution Overview
Problem
Laser scanning control systems face accuracy issues due to vibrations and external disturbances, leading to inaccuracies in directing laser light pulses to preselected angles.
Innovation Solution
A laser scanning control system that includes a motion estimator, based on a Kalman filter, to provide synchronized motion information for the mirror and laser pulse generation, ensuring that laser pulses are triggered only when the mirror is at preselected positions, thereby maintaining precision despite disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mirror is moved to direct laser light pulses towards specific directions, then the laser scanning coverage is improved, but the accuracy of the reflection direction deteriorates due to vibrations and external disturbances
Solution Approach 1:
The system uses feedback from motion sensors (accelerometers, gyroscopes) to detect actual mirror movements and vibrations. This feedback information is processed to determine compensation values that are applied to the laser pulse triggering timing, thereby compensating for deviations caused by vibrations and maintaining accurate reflection directions despite mirror movement
Solution Approach 2:
The system dynamically adjusts the timing parameters of laser pulse triggering based on detected mirror motion. By changing the trigger timing parameter in response to measured vibrations and movements, the system ensures that laser pulses are fired at the correct moments when the mirror is at the intended positions, maintaining scanning accuracy throughout the scanning range
2Measurement precision
If the laser pulse triggering is synchronized with preselected mirror positions, then the reflection direction precision is improved, but the system reliability deteriorates due to timing errors from vibrations
Solution Approach 1:
The system performs preliminary measurement of mirror motion characteristics using motion sensors before triggering laser pulses. By measuring the actual mirror position and velocity in advance and calculating the optimal trigger timing based on these measurements, the system ensures reliable synchronization that accounts for vibrations and dynamic conditions
Solution Approach 2:
The system continuously monitors mirror motion through feedback from motion sensors and uses this information to dynamically adjust laser pulse triggering timing. This closed-loop feedback mechanism ensures that timing synchronization remains reliable even when vibrations cause deviations from preselected positions
Data Source
AI summary
There are disclosed techniques for laser scanning control. A system includes control equipment to perform a coordinated scanning control by controlling: a mirror driver, to drive a mirror along desired mirror positions through a motion mirror control signal; and a laser driver, to generate laser light pulses to be impinged onto the mirror at the desired mirror positions through a pulse trigger control signal. The control equipment includes a motion estimator to provide estimated motion information based on feedback motion measurement(s), to generate the pulse trigger control signal by adapting a desired scheduling, for triggering the laser light pulses, to the estimated motion information.