Galvanometer Laser Synchronization Phase Control
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Solution Overview
Problem
Current MEMS-based solid-state LiDAR systems face challenges in synchronizing the emission period of a laser beam with the fast-axis movement of a galvanometer, leading to spatial coordinate dislocation in point clouds.
Innovation Solution
A method and apparatus for galvanometer-based laser synchronization controlling, which involves obtaining phase differences between the fast-axis drive signal and feedback signal, and the emission period of the laser beam, to align the laser beam in a preset direction, ensuring synchronization by adjusting the phase and frequency of the drive signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the emission period of the laser beam is not synchronized with the fast-axis movement of the galvanometer, then the system is easier to implement, but the spatial coordinates of the point cloud become dislocated
Solution Approach 1:
The patent applies feedback by obtaining a feedback signal from the galvanometer's fast-axis movement and using phase difference calculation between the drive signal and feedback signal to automatically adjust the laser emission timing. This closed-loop feedback mechanism ensures accurate synchronization without requiring complex manual calibration procedures.
Solution Approach 2:
The patent changes the timing parameter of the laser emission by calculating the phase difference between the galvanometer drive signal and feedback signal. By adjusting the emission period based on this phase difference, the system achieves precise synchronization between laser emission and galvanometer movement, resolving the coordinate dislocation issue.
2Measurement precision
If phase adjustment is performed to align the laser beam with the galvanometer movement, then the spatial coordinate accuracy is improved, but the control system becomes more complex
Solution Approach 1:
The system uses feedback from the galvanometer's position sensor to obtain real-time information about the fast-axis movement. By comparing the phase of the drive signal with the feedback signal, the system automatically determines the required phase adjustment for the laser emission, eliminating the need for complex manual phase calibration procedures.
Solution Approach 2:
The synchronization system performs self-calibration by automatically calculating the phase difference between the drive signal and feedback signal. The system adjusts its own emission timing based on this calculated phase difference without requiring external intervention or complex calibration equipment, thereby improving accuracy while maintaining simple operation.
3Power
If the frequency of the fast-axis drive signal is adjusted to maximize feedback amplitude, then the resonance movement effect is improved, but the synchronization with laser emission becomes more difficult
Solution Approach 1:
The system continuously monitors the feedback signal from the galvanometer and uses phase difference calculation to maintain synchronization between the laser emission and the galvanometer's resonant movement. This feedback mechanism ensures that even when the drive frequency is adjusted to maximize resonance amplitude, the laser emission remains precisely synchronized with the galvanometer position.
Solution Approach 2:
The system performs preliminary phase difference calculation and compensation before laser emission. By pre-adjusting the emission timing based on the calculated phase difference from the drive and feedback signals, the system ensures accurate synchronization is maintained even when operating at optimized resonance frequencies that might otherwise cause misalignment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively aligns the laser beam with the galvanometer's fast-axis movement, improving the accuracy of spatial coordinates in point clouds and maintaining real-time air pressure adaptability by adjusting the amplitude of the fast-axis drive signal.
Implementation Method 1
The galvanometer is used to combine horizontal scanning and vertical scanning into two-dimensional scanning. When a laser beam is emitted to a working galvanometer, the galvanometer reflects the laser beam to each position in the entire image
Implementation Method 2
a fast-axis drive signal drives the galvanometer to perform a resonance movement in the fast-axis direction
Data Source
AI summary
This application relates to a galvanometer-based laser synchronization controlling method, calibration method and apparatus, and a LiDAR. The galvanometer-based laser synchronization controlling method includes obtaining a fast-axis feedback signal when a galvanometer scans; obtaining a first phase difference between a fast-axis drive signal and the fast-axis feedback signal and obtaining a second phase difference between an emission period of a laser beam and the fast-axis drive signal; and setting a phase for the fast-axis drive signal based on the first phase difference and the second phase difference. T