Laser Receiver Beam Classification via Directional Analysis
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Solution Overview
Problem
Existing methods for comparing a received beam with a rotating laser beam struggle to accurately distinguish between the laser beam and reflections, leading to incorrect measurements due to the limitations in existing technologies.
Innovation Solution
The method involves determining the timing and direction of the received beam's movement relative to the laser receiver and comparing it with the direction of rotation of the rotating laser beam, using a detection field with multiple measurement areas to classify the beam as either a rotating laser beam or an extraneous beam based on matching or differing timing and direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If modulation signal is used to classify received beam, then laser beam identification is improved, but reflection detection capability deteriorates
Solution Approach 1:
The detection field is divided into multiple photodetector arrays arranged in a specific geometric pattern, with each array independently evaluating the received beam. This segmentation allows the system to compare spatial distribution patterns to distinguish direct laser beams from reflections, resolving the contradiction by adding spatial dimension analysis alongside temporal modulation detection.
Solution Approach 2:
The patent introduces an intermediary classification mechanism that first evaluates the spatial distribution of detected light across multiple photodetector arrays before applying modulation signal analysis. This intermediary step identifies potential reflections by detecting abnormal spatial patterns, allowing the system to then apply modulation analysis selectively or with adjusted parameters, thus maintaining both identification accuracy and reflection detection capability.
2Measurement precision
If multiple photodetector arrays are used to detect beam position, then measurement precision is improved, but device complexity increases
Solution Approach 1:
Each photodetector array serves multiple functions: it detects beam position, evaluates beam intensity distribution, and contributes to the overall classification decision. This multi-functionality reduces the need for separate dedicated components for each measurement task, thereby improving precision without proportionally increasing device complexity.
Solution Approach 2:
The patent merges the functions of multiple photodetector arrays into a unified evaluation system where all arrays work together to classify the received beam. By combining the detection and classification functions across arrays, the system achieves high measurement precision through cooperative operation rather than through complex individual components, thus managing device complexity while improving precision.
3Illumination intensity
If laser power is increased to improve beam visibility, then visibility is improved, but safety requirements are violated
Solution Approach 1:
The system uses feedback from multiple photodetector arrays to continuously evaluate the received beam characteristics. This feedback mechanism allows the laser receiver to adaptively adjust its detection parameters and classification thresholds based on the actual beam conditions, enabling reliable operation with lower laser powers that comply with safety requirements while maintaining adequate visibility through intelligent signal processing.
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 effectively reduces the risk of incorrect measurements by accurately differentiating between rotating laser beams and reflected beams, improving the reliability of leveling and marking work.
Implementation Method 1
The laser receiver comprises an evaluation unit and at least one detection field with a first measuring range and a second measuring range
Data Source
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AI summary
The invention relates to a method for comparing a receive beam (24) incident on a laser receiver (12) with a rotating laser beam (22), which is transmitted by a rotating laser (11) in a direction of rotation (23) about an axis of rotation (21), wherein the laser receiver (12) comprises an evaluation unit and at least one detection field (25) having a first measurement area and a second measurement area. When the receive beam (24) is incident on the at least one detection field (25) of the laser receiver (12), the evaluation unit determines a first receive signal, which represents the time progression of the incident receive beam (24) in the first measurement area, and a second receive signal, which represents the time progression of the incident receive beam (24) in the second measurement area. The evaluation unit determines a direction of movement of the receive beam (24) relative to the laser receiver (12) from the first and second receive signals, and the direction of movement of the receive beam (24) is compared by the evaluation unit with the direction of rotation (23) of the rotating laser beam (22).