Oscillating Mirror Array Control for In-Phase LIDAR Beam Steering
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Solution Overview
Problem
Existing LIDAR systems face challenges in efficiently scanning and mapping environments due to variations in moments of inertia and resonant frequencies among oscillating mirrors, which affect their ability to oscillate in phase and maintain accurate directional control for precise distance and direction measurements.
Innovation Solution
A beam-steering device for LIDAR systems that uses an array of oscillating mirrors aligned in parallel, driven by electromagnets with orientation feedback systems to adjust driving parameters, ensuring the mirrors oscillate in phase at an operating frequency, thereby maintaining precise directional control and scanning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an array of oscillating mirrors is used to scan the LIDAR system, then scanning speed and coverage are improved, but variations in moments of inertia and resonant frequencies among the mirrors cause phase differences that degrade measurement precision
Solution Approach 1:
The patent employs orientation feedback systems that sense the actual orientations of individual mirrors and use this information to adjust driving parameters in real-time. This feedback mechanism compensates for variations in moments of inertia and resonant frequencies, ensuring all mirrors oscillate in phase despite their individual differences, thereby maintaining measurement precision while enabling high-speed scanning
Solution Approach 2:
The system dynamically adjusts driving parameters for each mirror based on their specific characteristics. By making the driving parameters adaptive rather than fixed, the system optimizes the oscillation of each mirror to achieve synchronized in-phase operation across the entire mirror array, resolving the contradiction between scanning speed and measurement accuracy
2Productivity
If electromagnets are used to drive the mirrors at high frequency, then scanning efficiency is improved, but mechanical deformation of the mirrors may occur
Solution Approach 1:
The patent carefully controls and optimizes the driving parameters including frequency, amplitude, and phase for each mirror. By adjusting these parameters within safe operating ranges, the system achieves high-frequency scanning while preventing mechanical deformation of the mirrors, thus maintaining both scanning efficiency and structural integrity
3Measurement precision
If individual driving parameters are adjusted for each mirror to achieve in-phase oscillation, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The orientation feedback systems provide real-time information about each mirror's actual orientation, enabling the control system to automatically adjust driving parameters. This feedback-based approach simplifies the control architecture compared to complex open-loop control schemes, as the system self-corrects for individual mirror variations without requiring manual calibration or overly complex control algorithms
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 solution allows for high-frequency oscillation of the mirror array without mechanical deformation, enabling accurate three-dimensional mapping and obstacle detection, enhancing the LIDAR system's ability to navigate autonomously in dynamic environments.
Implementation Method 1
The mirrors are driven by a set of electromagnets arranged to apply torque on the mirrors
Implementation Method 2
The emitted light pulses are scanned through the scanning zone by reflecting the light from an array of oscillating mirrors
Implementation Method 3
determining the distance to the reflective object according to the time delay between the emitted pulse and the reception of the reflected pulse
Data Source
AI summary
A light detection and ranging (LIDAR) device scans through a scanning zone while emitting light pulses and receives reflected signals corresponding to the light pulses. The LIDAR device scans the emitted light pulses through the scanning zone by reflecting the light pulses from an array of oscillating mirrors. The mirrors are operated by a set of electromagnets arranged to apply torque on the mirrors, and an orientation feedback system senses the orientations of the mirrors. Driving parameters for each mirror are determined based on information from the orientation feedback system. The driving parameters can be used to drive the mirrors in phase at an operating frequency despite variations in moments of inertia and resonant frequencies among the mirrors.