Laser Scanning Control Device for Reflection Prism Saturation
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Solution Overview
Problem
Laser scanning techniques face challenges with intense light reflection from reflection prisms, leading to saturation of light reception units and reduced distance measurement accuracy, especially in environments affected by factors like rain, fog, and dust.
Innovation Solution
A laser scanning control device and method that perform first and second laser scanning operations, with the processor determining the state of saturation based on output waveforms from the light reception unit and adjusting the light intensity to prevent saturation during the second scanning, ensuring accurate distance measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light reduction filters are used to reduce light intensity from reflection prisms, then saturation of the light reception unit is prevented, but distance measurement accuracy deteriorates due to excessive light reduction
Solution Approach 1:
The patent applies dynamics by making the light reduction filter adjustable and variable rather than fixed. The filter's light reduction degree can be dynamically changed based on detected saturation levels, allowing the system to adapt between preventing saturation and maintaining measurement accuracy through real-time adjustment of the filter's transmission characteristics
Solution Approach 2:
The patent implements feedback by detecting the saturation state of the light reception unit and using this information to control the light reduction filter. The system continuously monitors saturation levels and adjusts the filter accordingly, creating a closed-loop control system that balances saturation prevention with measurement accuracy
2Measurement precision
If light reduction filters are not used or insufficiently adjusted, then distance measurement light intensity is maintained, but the light reception unit saturates due to intense reflected light from reflection prisms
Solution Approach 1:
The system dynamically adjusts the light reduction filter based on real-time saturation detection, transitioning between different light reduction states to prevent saturation while maintaining adequate signal intensity for accurate measurement
Solution Approach 2:
The patent changes the transmission parameter of the light reduction filter based on saturation conditions. By adjusting the filter's light reduction degree as a variable parameter, the system optimizes the balance between preventing saturation and maintaining measurement accuracy
3Reliability
If manual adjustment of light reduction filters is performed through experimental positioning, then appropriate light intensity can be achieved, but the number of operation steps increases significantly
Solution Approach 1:
The system performs self-service by automatically detecting saturation conditions and adjusting the light reduction filter without requiring manual experimental positioning. The automated control system eliminates the need for operators to perform multiple trial adjustments, reducing operational complexity while maintaining appropriate light intensity
Solution Approach 2:
The feedback mechanism enables automatic adjustment by continuously monitoring saturation levels and controlling the light reduction filter accordingly, replacing manual experimental procedures with an automated closed-loop control system
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 allows for high-accuracy positioning of reflection prisms by reducing light intensity to prevent saturation, thereby enhancing distance measurement accuracy and reducing operational steps in adjusting light reduction filters.
Implementation Method 1
a light reception unit... determine a state of saturation of the light reception unit, with respect to a laser-scanned point cloud obtained in the first laser scanning
Implementation Method 2
light that is reflected back from the reflection prism... laser scanning is performed in a state in which a reflection prism is set up as a target
Data Source
AI summary
A technique for solving problems related to intense light that is reflected back from a reflector target in laser scanning, is provided. A processing device controls laser scanning that is performed by a laser scanning apparatus having a light reception unit. The processing device includes a laser scanning apparatus controller, a saturation determination unit, and a variable optical attenuator controller. The laser scanning apparatus controller makes the laser scanning apparatus execute first laser scanning and second laser scanning. The saturation determination unit determines a state of saturation of the light reception unit, with respect to laser-scanned point clouds obtained in the first laser scanning. The variable optical attenuator controller adjusts an intensity of light to be received by the light reception unit in the second laser scanning, based on a result of determination.