Optoelectronic Sensor 3D Resolution Laser Budget
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Solution Overview
Problem
Current optoelectronic sensors face challenges in achieving high lateral resolution for three-dimensional image data detection without increasing measurement time or system complexity, particularly in laser scanners, where improving angular resolution compromises response time and measurement repetition rate.
Innovation Solution
An optoelectronic sensor and method that illuminate a monitored zone with modulated light, using a control and evaluation unit to determine times of flight from remitted light at multiple locations, shifting these locations between measurement repetitions to achieve a finer resolution pattern, concentrating transmission power on actual measurement points and dynamically adapting illumination and reception to optimize resolution and measurement time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the repetition rate of individual measurements is increased to improve angular resolution in laser scanners, then measurement precision is improved, but the laser budget is overloaded and eye protection issues arise
Solution Approach 1:
The patent divides the measurement process into multiple passes, where each pass collects data at a lower repetition rate. The final high-resolution image is synthesized by combining data from multiple passes with different lateral shifts, avoiding the need for continuously high repetition rates that would overload the laser budget.
Solution Approach 2:
The patent employs periodic lateral shifts of the measurement pattern between passes. By periodically varying the lateral position of measurement points across multiple passes, the system accumulates sufficient data for high-resolution reconstruction without requiring sustained high repetition rates that would exceed laser safety limits.
2Object-affected harmful factors
If the revolution frequency of the laser scanner is reduced to avoid laser budget overload, then eye protection is ensured, but response time and measurement value repetition rate deteriorate
Solution Approach 1:
The patent creates multiple copies of the measurement pattern at different lateral positions across different passes. By collecting data from multiple shifted patterns and synthesizing them computationally, the system achieves high angular resolution without requiring a single high-speed scanning pass, thus maintaining safe revolution frequencies for eye protection.
3Measurement precision
If the number of measurement beams is increased in a multi-beam system to improve resolution, then measurement precision is improved, but system complexity and cost increase
Solution Approach 1:
The patent introduces dynamic lateral shifting of the measurement pattern between passes. Instead of using a static multi-beam system with fixed high resolution, the system dynamically varies the lateral position of measurement points across passes and uses computational synthesis to achieve the effective high resolution, reducing hardware 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
This approach enhances lateral resolution without delaying measurement output, allowing for flexible trade-offs between measurement time and resolution, and reduces hardware demands compared to high-resolution sensors or complex laser scanners, enabling fast data availability with high-resolution imaging.
Implementation Method 1
an illumination unit for illuminating the monitored zone with modulated transmitted light
Implementation Method 2
a control and evaluation unit which is configured to determine times of flight from properties of the modulated and remitted transmitted light
Data Source
AI summary
An optoelectronic sensor for detecting three-dimensional image data from a monitored zone is provided that has an illumination unit for illuminating the monitored zone with modulated transmitted light, a light receiver for a simultaneous light reception of the transmitted light remitted by objects in the monitored zone at at least two locations at a mutual distance corresponding to a first resolution pattern, and a control and illumination unit that is configured to determine times of flight from properties of the modulated and remitted transmitted light and to detect three-dimensional data in a second resolution pattern finer than the first resolution pattern by at least one measurement repetition with a light reception from at least two other locations shifted with respect to the first resolution pattern.