LIDAR Eye Safety Control via Dual Position Monitoring
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Solution Overview
Problem
Coherent LIDAR systems face challenges in achieving long-range detection (>200 m), high data rate (>1M pixels/s), and high optical resolution (>100 vertical pixels) while ensuring eye safety, which is crucial for commercial viability and legal compliance.
Innovation Solution
The implementation of an independent dual monitoring system with firmware-based Build in Self-Test (BIST) and multi-layer output control for eye safety mechanisms, allowing self-characterization of thresholds and response time, and enabling optimal BIST with minimal optical power output during testing, thereby ensuring compliance with eye safety specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If coherent LIDAR system operates at high power to achieve long-range detection (>200 m) and high data rate (>1M pixels/s), then detection capability is improved, but eye safety risk increases
Solution Approach 1:
The patent implements real-time feedback mechanisms through dual monitoring systems that continuously track optical power output and scanning position. The system compares measured values against pre-defined safety thresholds and automatically adjusts laser power or shuts down operation when thresholds are approached, enabling high-power operation within safe boundaries through continuous closed-loop control
Solution Approach 2:
The system performs preliminary safety assessments through built-in self-test (BIST) routines and pre-characterization of safety thresholds before actual operation. Safety margins are established in advance through calibration and testing, allowing the system to operate at high power levels while maintaining predetermined safety buffers against eye hazard
2Object-affected harmful factors
If eye safety monitoring system is added to ensure safety compliance, then safety is improved, but device complexity increases
Solution Approach 1:
The monitoring system is designed to serve multiple functions simultaneously: it characterizes optical power output for safety assessment, tracks scanning component position for hazard prediction, performs built-in self-test validation, and provides real-time control feedback. By making the monitoring infrastructure multi-functional, the patent reduces overall system complexity while maintaining comprehensive safety coverage
Solution Approach 2:
The patent combines safety monitoring functions with existing LIDAR control and scanning systems. The dual monitoring architecture integrates safety threshold evaluation within the existing signal processing and control loops, merging safety functions with operational control rather than adding completely separate independent systems
3Reliability
If built-in self-test is performed at high optical power to validate safety thresholds, then safety validation is improved, but optical power consumption increases
Solution Approach 1:
The built-in self-test performs safety validation using reduced optical power levels compared to full operational power. The system executes threshold validation and safety verification at partial power settings, which is sufficient to confirm safety margins without consuming excessive energy. This partial action approach maintains reliability validation while minimizing power consumption during testing
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 enables the LIDAR system to operate as a Class I laser product, ensuring safe and effective long-range detection with high optical resolution and data rate, while minimizing optical power output during testing to meet commercial and regulatory requirements.
Implementation Method 1
a photodetector to detect light reflected from the target
Implementation Method 2
a laser source and emitter optics to direct light into a field of view
Data Source
AI summary
A light detection and ranging system is provided. The light detection and ranging system includes a LIDAR scanning mirror; a processor configured to control the LIDAR scanning mirror; a first position sensor configured to determine a first position and a second position sensor configured to detect a second position of the LIDAR scanning mirror. The processor is configured to determine whether an eye-safety criterion is met based on the first position and the second position, and control light output of the LIDAR system based on whether the eye-safety criterion is met.