Light Grid Programmable Evaluation Unit for Object Detection
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Solution Overview
Problem
Current light grid systems require powerful external evaluation units and data interfaces to process large amounts of data for complex two-dimensional evaluations, leading to high effort and cost demands, and lack the capability for direct machine control or programmable logic controller output signals.
Innovation Solution
A light grid with a programmable evaluation unit integrated in the reception unit that evaluates light beam signals using predefined criteria, forming intermediate results and outputting signals directly, allowing for reduced data storage and processing, and enabling flexible programming for various applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a powerful external evaluation unit is used to process complex two-dimensional evaluations, then the evaluation capability is improved, but the cost and effort demands increase
Solution Approach 1:
The evaluation process is segmented into two levels: a simple evaluation unit in the light grid that performs basic beam evaluation and generates intermediate results, and a more powerful external evaluation unit that performs complex two-dimensional evaluation. This segmentation allows the system to achieve high adaptability for complex evaluations while keeping the light grid itself simple and cost-effective.
Solution Approach 2:
Intermediate results serve as an intermediary between the simple light grid evaluation unit and the powerful external evaluation unit. The light grid generates compressed intermediate results that contain essential information for complex evaluation, reducing data transmission requirements and allowing the external unit to focus computational power on the actual complex evaluation task.
2Measurement precision
If a large amount of data is transmitted to the external evaluation unit, then the evaluation accuracy is improved, but the data interface complexity and transmission demands increase
Solution Approach 1:
The evaluation unit extracts only the essential information from the raw beam data and transmits it as compressed intermediate results to the external evaluation unit. This extraction process maintains evaluation accuracy by preserving critical object detection information while significantly reducing data volume and interface complexity.
Solution Approach 2:
The system changes the parameter representation of evaluation data by transforming raw beam interruption data into compressed intermediate results with specific parameters (such as object presence, position, and basic characteristics). This parameter transformation maintains the information needed for accurate evaluation while reducing data transmission requirements.
3Reliability
If continuous stitching of sectional frames is performed to form images, then the object detection completeness is improved, but the processing time and computational load increase
Solution Approach 1:
The evaluation unit in the light grid performs preliminary evaluation of beam data and generates compressed intermediate results before transmission to the external unit. This preliminary action pre-processes the data to extract essential information, reducing the computational load and time required for complete object detection and image formation at the external evaluation unit.
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 reduces the computational and storage demands on the evaluation unit, allowing for efficient object detection and classification within the light grid, minimizing data transmission and enabling direct machine control, while being versatile and adaptable to different applications with reduced interface complexity.
Implementation Method 1
a transmission unit (2) having a plurality of light transmitters (3) for transmitting light beams (4) and a reception unit (5) having a plurality of light receivers (6) for receiving the light beams (4)
Data Source
AI summary
A light grid and a method using a light grid include a transmission unit having a plurality of light transmitters for transmitting light beams and a reception unit having a plurality of light receivers for receiving the light beams of the light transmitters. The transmission unit and the reception unit are spaced apart from one another and are disposed opposite one another. A monitored field is formed by oppositely disposed light transmitters and light receivers for detecting objects. The light transmitters are activated one after the other in cycles and the light receivers are evaluated in these cycles. A programmable evaluation unit is provided for evaluating the received signals of the light receivers of a cycle with reference to predefined beam evaluation criteria and forming an intermediate result therefrom. The evaluation unit evaluates at least one intermediate result of a cycle with reference to at least one predefined sequential criterion.