Plug-In Diagnostics for Light Curtain Sensor Failure Prediction
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Solution Overview
Problem
Existing optoelectronic sensors in light curtains often fail unexpectedly, leading to costly shutdowns and potential safety risks, as they do not provide proactive alerts for impending failures, requiring post-failure detection rather than predictive maintenance.
Innovation Solution
Incorporating a diagnostic unit with wireless communication means into the optoelectronic sensor, allowing for monitoring of operational parameters such as light intensity, LED degradation, and electromagnetic interference, enabling predictive maintenance and alerts for potential failures without physical access to the sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional optoelectronic sensors are used without diagnostic units, then the device complexity is low, but the reliability is poor due to unexpected failures
Solution Approach 1:
The sensor system is divided into separate functional modules: the main sensor unit and a detachable diagnostic plug-in unit. This segmentation allows the diagnostic functionality to be added only when needed, improving reliability without permanently increasing the base device complexity. The plug-in unit can be removed or ignored in simple applications.
Solution Approach 2:
The diagnostic unit performs preliminary monitoring and detection of potential failures before they occur. By continuously analyzing operational parameters and detecting early signs of degradation, the system can alert users to impending failures, allowing preventive maintenance before actual sensor failure disrupts operation.
2Reliability
If continuous monitoring of operational parameters is implemented, then the reliability improves through predictive maintenance, but the use of energy increases
Solution Approach 1:
The diagnostic unit performs monitoring and analysis at periodic intervals rather than continuously. It samples operational parameters at defined time intervals, evaluates them against threshold values, and generates alerts only when anomalies are detected. This periodic operation significantly reduces energy consumption compared to continuous monitoring while still providing effective predictive maintenance capability.
3Reliability
If diagnostic functionality is integrated into the sensor, then the reliability improves, but the ease of manufacture decreases
Solution Approach 1:
The diagnostic functionality is separated into a standalone plug-in unit that can be manufactured independently from the main sensor. This allows each component to be optimized and manufactured separately using standard processes, then assembled through simple mechanical and electrical connections. The detachable design simplifies manufacturing quality control and assembly compared to integrating diagnostics into the sensor housing.
Solution Approach 2:
The plug-in diagnostic unit is designed with universal applicability to work with multiple sensor models and configurations. It provides standardized diagnostic functions that can be applied across different sensor types, reducing the need for custom-manufactured diagnostic solutions for each sensor variant and thereby improving ease of manufacture.
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 risk of unexpected failures by providing proactive alerts and enabling scheduled maintenance, ensuring continuous operation and safety while being cost-effective and compatible with existing systems.
Implementation Method 1
at least one first optical unit comprising at least one radiation emitting element and at least one radiation receiving element
Data Source
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AI summary
The present invention relates to an optoelectronic sensor that can be used with light curtains, in particular safety light curtains, for monitoring a sensing field. Furthermore, the present invention relates to a method of operating such an optoelectronic sensor. An optoelectronic sensor comprises at least one first optical unit comprising at least one radiation emitting element and at least one radiation receiving element, and a control unit for processing an output signal generated by said radiation receiving element and for generating a defined sensor signal based on the output signal. The at least one first optical unit has a diagnostic unit, wherein the diagnostic unit comprises a monitoring unit that is operable to monitor at least one parameter indicative of an operational status of the optical unit, and wherein the diagnostic unit comprises a processing unit that is operable to generate a communication signal indicative of said operational status, wherein said diagnostic unit is arranged in a separately housed, detachable plug-in module and wherein said processing unit comprises a wireless communication interface for wirelessly receiving and transmitting communication signals.