Optoelectronic Safety Sensor With Adaptive Trigger Thresholds
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Solution Overview
Problem
Conventional optoelectronic safety sensors face challenges in balancing detection reliability and robustness due to fixed triggering thresholds, leading to potential safety errors and unnecessary safety reactions, especially when evaluating complex sensor data from protective fields.
Innovation Solution
The safety sensor adapts its detection sensitivity based on situational criteria, using additional information from preparation fields and other detected objects to dynamically adjust the trigger threshold, ensuring optimal balance between detection safety and availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed triggering threshold is used to ensure safety, then detection reliability is improved, but false alarms increase and availability decreases
Solution Approach 1:
The patent implements dynamic adjustment of the triggering threshold based on contextual information from multiple sensors. The evaluation unit continuously adapts the threshold value according to environmental conditions, object characteristics, and sensor data patterns, transforming the static threshold into a dynamic parameter that optimizes both safety and availability
Solution Approach 2:
The system changes the triggering threshold parameter based on analyzed sensor data and contextual information. By modifying this critical parameter dynamically, the system achieves optimal balance between detection reliability and false alarm reduction without compromising safety standards
2Reliability
If a sensitive triggering threshold is used to detect all hazards, then detection reliability is improved, but unnecessary safety reactions increase
Solution Approach 1:
The evaluation unit serves as an intermediary between raw sensor data and safety reactions. It analyzes contextual information from multiple sources before triggering safety responses, filtering out false alarms while maintaining sensitivity to real hazards through intelligent mediation
Solution Approach 2:
The system incorporates feedback mechanisms where the evaluation unit continuously monitors sensor data patterns and adjusts the triggering threshold accordingly. This feedback loop enables the system to learn from previous detections and reduce false alarms while maintaining high detection reliability
3Reliability
If additional sensor information is processed to improve detection accuracy, then detection reliability is improved, but system complexity increases
Solution Approach 1:
The evaluation unit performs multiple functions: it processes sensor data, analyzes contextual information, adapts triggering thresholds, and generates safety reactions. This multi-functional component consolidates complexity into a single unit that handles diverse tasks through a unified architecture
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 the reliability and robustness of safety sensor performance by quickly responding to potential hazards while minimizing false alarms and maintaining high availability.
Implementation Method 1
a light receiver (24) is provided that captures object data, preferably in two or even three dimensions and, depending on the embodiment, for example in the form of a pixel-resolved image
Data Source
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Figure 3
AI summary
An optoelectronic safety sensor (10) for safeguarding a machine (34) is described, comprising a light receiver (24) for optically detecting object data and a control and evaluation unit (26) configured to determine, based on the object data, whether a safety-critical object (36) is detected in the vicinity of the machine (34) and, if so, to trigger a safety-related response. Furthermore, the control and evaluation unit (26) is configured to adjust the sensitivity of a criterion for determining whether a safety-critical object (36) is detected, depending on previously and/or simultaneously detected objects.