Optoelectronic Button Detection Under Variable Field Conditions
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Solution Overview
Problem
Reliable detection of optoelectronic button actuation in field devices is challenging due to varying environmental conditions, material types of control panels, and potential explosive atmospheres, which complicates the differentiation between 'button push' and other influences like solar radiation or contamination.
Innovation Solution
A method that determines the location (interior or exterior) and material of the field device to adjust evaluation conditions for detecting optoelectronic button actuation, using time-profile-dependent and independent values, and environmental conditions like electromagnetic radiation, with adjustable comparison values for accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single evaluation condition is used for detecting optoelectronic button actuation, then the device structure remains simple, but the detection reliability deteriorates under varying environmental conditions
Solution Approach 1:
The patent implements dynamic adaptation of evaluation conditions based on detected environmental parameters. The system automatically switches between different evaluation conditions (first evaluation condition for interior areas, second evaluation condition for exterior areas) depending on the detected location and environmental conditions, making the detection system adaptive rather than static.
Solution Approach 2:
The patent changes the parameters of the evaluation condition based on environmental factors. Specifically, it uses a first evaluation condition comparing current output signal values to a first comparison value in interior areas, and a second evaluation condition comparing current output signal values to a second comparison value in exterior areas, thereby adapting the detection parameters to match environmental conditions.
2Measurement precision
If different evaluation conditions are used for interior and exterior areas, then the detection accuracy improves, but the device complexity increases
Solution Approach 1:
The patent segments the evaluation process into distinct evaluation conditions for different operational environments. It divides the detection space into interior areas and exterior areas, applying specific evaluation conditions to each segment, thereby improving precision within each segment while managing overall complexity through structured segmentation.
Solution Approach 2:
The patent performs preliminary detection of environmental conditions (location determination, solar radiation detection) before applying the appropriate evaluation condition. This preliminary action allows the system to pre-select the correct evaluation condition based on the detected environment, ensuring accurate detection without requiring complex real-time adjustments during the actual button actuation detection.
3Reliability
If environmental factors like solar radiation are considered in detection, then the reliability improves, but the complexity of the detection system increases
Solution Approach 1:
The patent incorporates feedback from environmental sensors (solar radiation detectors, location detectors) into the detection process. The system continuously monitors environmental conditions and uses this feedback to dynamically adjust the evaluation conditions, ensuring reliable detection while managing complexity through feedback-driven adaptation rather than complex hard-coded logic.
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
Enables reliable detection of optoelectronic button actuation by adapting to environmental and material-specific conditions, improving accuracy and robustness against environmental influences.
Implementation Method 1
at least one transmitting unit, which is arranged on an inner side of the control panel facing away from the outer side and is designed to transmit an optical signal in the direction of the control panel
Implementation Method 2
has at least one receiving unit corresponding to the at least one transmitting unit, for receiving the optical signal, wherein the receiving unit is arranged on the inner side of the control panel in such a way that an optical signal scattered at the control panel by a finger of the user or at another scattering object at least partially reaches the at least one receiving unit
Data Source
AI summary
A method for operating at least one optoelectronic button or operating element arranged behind an optically transparent control panel of a field device of automation technology for detecting an actuation of the optoelectronic button or operating element by an operator of the field device includes detecting whether the field device of automation technology is located in an interior area or in an exterior area; defining an evaluation condition which is used to detect the actuation of the optical button or control element; and detecting or evaluating whether an actuation of the optoelectronic button or control element is present based on the defined evaluation condition.