Hall Sensor Magnetic Sensing for Galvanometer Angular Position
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Solution Overview
Problem
LiDAR systems face challenges in accurately sensing the angular position of galvanometer scanners in real-time, which is crucial for achieving high-resolution scans and adaptive feedback control, especially around the center of the scanning range.
Innovation Solution
A magnetic sensing system utilizing a disc permanent magnet and a Hall sensor to generate a voltage proportional to the magnetic field strength, allowing for real-time determination of the rotation angle of the galvanometer scanner, with one component mounted on the scanner and the other off it, enabling closed-loop feedback control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a Hall sensor and disc permanent magnet system is implemented for real-time angular position sensing, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical position sensing mechanisms with a magnetic field-based sensing system using a Hall sensor and permanent magnet. This substitution achieves precise angular position measurement through magnetic field detection while avoiding the mechanical complexity of traditional encoders or potentiometers, directly resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The patent utilizes changes in magnetic field parameters (strength and direction) as the permanent magnet rotates with the galvanometer scanner. The Hall sensor detects these parameter changes to determine angular position, transforming a mechanical rotation problem into a magnetic field parameter detection problem, thereby improving measurement precision without proportionally increasing system complexity
2Manufacturing precision
If the galvanometer scanner rotates slower in the middle of the scanning range to achieve higher resolution, then manufacturing precision is improved, but productivity decreases
Solution Approach 1:
The patent implements real-time angular position feedback using the Hall sensor to enable closed-loop control of the galvanometer scanner. This feedback mechanism allows the system to dynamically adjust scanning speed based on position, maintaining high resolution at the center while compensating for time loss, thus resolving the contradiction between scan resolution and scanning productivity
Solution Approach 2:
The patent enables dynamic scanning speed adjustment through real-time position sensing. The system can vary the rotation speed of the galvanometer scanner during operation, slowing down at the center for high-resolution scanning and speeding up at the edges, optimizing both manufacturing precision and productivity throughout the scanning cycle
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
Enables precise real-time angular position sensing of the galvanometer scanner, improving scan resolution and adaptive control, thereby enhancing the performance of LiDAR systems in applications like autonomous driving and high-definition mapping.
Implementation Method 1
a Hall sensor configured to generate a voltage proportional to the strength of the magnetic field as the Hall sensor and the disc permanent magnet move relatively to each other
Data Source
AI summary
Embodiments of the disclosure provide magnetic sensing systems and methods for a galvanometer scanner configured to rotate within a predetermined angular range. An exemplary magnetic sensing system includes a disc permanent magnet configured to provide a magnetic field. The magnetic sensing system further includes a Hall sensor configured to generate a voltage proportional to the strength of the magnetic field as the Hall sensor and the disc permanent magnet move relatively to each other when the galvanometer scanner rotates. One of the disc permanent magnet and the Hall sensor locates on and rotates with the galvanometer scanner and the other locates off the galvanometer scanner. The magnetic sensing system also includes at least one controller configured to determine a rotation angle of the galvanometer scanner based on the generated voltage by the Hall Sensor.