Oscillating Mirror Array Phase Control for 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 at high frequencies, leading to mechanical deformation and reduced scanning accuracy.
Innovation Solution
A beam-steering device for LIDAR systems that uses an array of oscillating mirrors aligned in parallel, driven by electromagnets and feedback sensors to adjust driving parameters, ensuring the mirrors oscillate in phase at an operating frequency, despite variations in resonant frequencies and moments of inertia, by monitoring impedance and optical feedback to maintain precise orientation and amplitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an array of oscillating mirrors is used to scan light pulses through the scanning zone, then the scanning speed and productivity of the LIDAR system is improved, but variations in moments of inertia and resonant frequencies among the mirrors cause them to oscillate out of phase, leading to mechanical deformation and reduced measurement precision
Solution Approach 1:
The patent employs feedback sensors to detect the actual oscillation state of each mirror and uses this information to adjust driving parameters in real-time. This closed-loop control system compensates for variations in moments of inertia and resonant frequencies, ensuring all mirrors oscillate in phase at the desired operating frequency, thereby maintaining both high scanning speed and measurement precision
Solution Approach 2:
The system dynamically adjusts driving parameters (such as frequency and amplitude) for each mirror based on its specific characteristics. By changing these parameters individually for each mirror, the system compensates for manufacturing variations and ensures synchronized oscillation across the entire mirror array, resolving the contradiction between fast scanning and accurate measurement
2Productivity
If the mirrors are driven to oscillate at high frequencies to improve scanning efficiency, then the productivity of the LIDAR system increases, but mechanical deformation occurs due to variations in moments of inertia, reducing reliability
Solution Approach 1:
Feedback sensors continuously monitor the oscillation state of each mirror during high-frequency operation. This real-time information allows the control system to detect and correct deviations caused by mechanical variations, maintaining stable and reliable oscillation even at high scanning frequencies
Solution Approach 2:
The system transitions from static, uniform driving parameters to dynamic, adaptive parameters that change in response to actual mirror behavior. This allows the mirrors to operate reliably at high frequencies by continuously adjusting driving conditions to match each mirror's specific mechanical characteristics
3Measurement precision
If individual driving parameters are adjusted for each mirror to account for variations in resonant frequencies, then the measurement precision and phase coherence is improved, but the device complexity increases due to the need for multiple sensors and control circuits
Solution Approach 1:
The patent employs a universal feedback control architecture that can be applied to each mirror using the same basic components and algorithms. This modular approach allows individualized parameter adjustment for each mirror while using standardized control circuits, reducing overall system complexity compared to custom-designed control systems for each mirror
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 mirrors without mechanical deformation, enhancing the scanning accuracy and efficiency of LIDAR systems in generating three-dimensional point maps for autonomous vehicle navigation.
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
an orientation feedback system senses the orientations of the mirrors
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.