Galvanometer Drive Control for Dense LiDAR Scanning Tracks
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Solution Overview
Problem
Conventional galvanometers used in laser scanning exhibit large unscanned gaps and low resolution due to the combination of conventional sine and triangular waves, leading to significant blind areas and reduced scanning efficiency.
Innovation Solution
A galvanometer control method involving a first shaft drive voltage and a second shaft drive voltage, where the voltages are superimposed to create N scanning tracks within a second shaft drive period, with specific phase and voltage relationships to ensure overlapping and denser scanning patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sine wave and triangular wave are combined to drive the galvanometer, then the galvanometer can perform laser scanning, but there is a large unscanned gap causing large blind area and low resolution
Solution Approach 1:
The patent divides the scanning process into multiple independent scanning tracks by applying different phase shifts to the drive signals. Instead of using a single conventional driving waveform that creates large gaps, the system segments the scanning coverage into multiple overlapping tracks that collectively eliminate blind areas and improve resolution.
Solution Approach 2:
The patent introduces a phase shift dimension to the traditional sine-triangular wave combination driving method. By adding phase shift parameters to the drive signals, the system creates multiple scanning tracks in the angular domain, transforming a single-gap scanning pattern into a multi-track overlapping pattern that fills blind areas.
2Measurement precision
If conventional galvanometer driving method is used, then the structure is simple, but the scanning coverage has large gaps and low resolution
Solution Approach 1:
The patent employs dynamic phase shifting of the drive signals to generate multiple scanning tracks. The phase shift parameters are dynamically adjusted based on the scanning requirements, allowing the system to adaptively control the galvanometer's scanning behavior and optimize coverage without requiring complex mechanical structures.
Solution Approach 2:
The patent changes the parameters of the drive signals (amplitude, frequency, and phase shift) to achieve optimal scanning performance. By adjusting these electrical parameters, the system creates multiple overlapping scanning tracks that eliminate blind areas, improving resolution without adding mechanical complexity.
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
The method reduces blind areas and improves scanning resolution by ensuring complete coverage and denser scanning tracks, enhancing the scanning efficiency of the galvanometer.
Implementation Method 1
a first shaft drive voltage is used to control the galvanometer to vibrate around the first shaft, and a second shaft drive voltage is used to control the galvanometer to vibrate around the second shaft
Data Source
AI summary
This application discloses a galvanometer and a LiDAR. The galvanometer includes a first shaft and a second shaft. A first shaft drive voltage is used to control the galvanometer to vibrate around the first shaft, a second shaft drive voltage is used to control the galvanometer to vibrate around the second shaft, and the first shaft drive voltage and the second shaft drive voltage are superimposed to drive the galvanometer. There are N working intervals in a second shaft drive period, and in the N working intervals, the second shaft drive voltage and the first shaft drive voltage jointly drive the galvanometer to form N scanning tracks. The N scanning tracks do not coincide and N is a positive integer.