Inductive Proximity Sensing with Digitized Pulse Scanning
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Solution Overview
Problem
Inductive proximity sensors typically have limited switching distance and reduction factors, making them less effective in harsh environments and less versatile for detecting metal objects of different alloys and materials.
Innovation Solution
An inductive proximity sensor design that digitizes induced voltage pulses generated by transmission current pulses, allowing for detailed scan value analysis to determine object distance and composition, using a transmitter and receiver coil configuration with an amplifier and analog-to-digital converter for enhanced signal processing and noise reduction, and a metallic housing for mechanical robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional inductive sensor design with plastic housing and simple evaluation is used, then device complexity is low and ease of manufacture is high, but switching distance is limited and reduction factor is low
Solution Approach 1:
The sensor system dynamically adapts its evaluation parameters by scanning multiple sections of the voltage pulse and selectively evaluating different scan values based on object material properties. The control unit dynamically adjusts which pulse sections are analyzed to optimize detection for different metal types, enabling extended switching distance while maintaining manageable complexity through adaptive rather than purely static design
Solution Approach 2:
The invention adds a temporal dimension to signal evaluation by scanning the voltage pulse at multiple time points and sections rather than using a single fixed evaluation point. This multi-temporal scanning approach extracts additional information from the pulse waveform, effectively increasing measurement precision and switching distance without proportionally increasing hardware complexity
2Adaptability or versatility
If multi-section voltage pulse scanning and digitization is implemented, then switching distance increases and object classification improves, but device complexity and manufacturing cost increase
Solution Approach 1:
The control unit serves multiple functions: it generates transmission current pulses, scans voltage pulses at multiple sections, digitizes analog signals, evaluates scan values for distance determination, and classifies object materials. By consolidating these diverse functions into a single integrated control unit rather than separate dedicated circuits, the invention achieves high adaptability and material classification capability while controlling manufacturing complexity
Solution Approach 2:
The system changes evaluation parameters dynamically by selecting different scan sections and evaluation points based on the detected object material. Instead of requiring separate hardware for each material type, the invention achieves versatility through parameter adaptation - adjusting which portions of the voltage pulse are analyzed depending on whether the object is ferromagnetic, non-ferromagnetic, or another material type
3Measurement precision
If larger switching distance is achieved through enhanced signal processing, then detection capability improves, but sensor size and complexity increase
Solution Approach 1:
The voltage pulse evaluation is segmented into multiple sections with different scan points, allowing the system to extract maximum information from the available signal. By dividing the pulse analysis into discrete temporal segments rather than using a single monolithic evaluation approach, the invention achieves extended detection distance through intelligent signal processing without requiring proportional increases in sensor size or hardware complexity
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
The sensor achieves a high switching distance, enabling detection at larger distances, reducing mechanical risk, and allowing for precise assembly tolerance, miniaturization, and material classification, while improving signal-to-noise ratio and robustness.
Implementation Method 1
at least one transmission current pulse can be applied to the coil by a control and evaluation unit, having the control and evaluation unit for outputting an object detection signal
Data Source
AI summary
A method and an inductive proximity sensor for detecting an object having at least one coil, wherein at least one transmission current pulse can be applied to the coil by a control and evaluation unit and having the control and evaluation unit for outputting an object detection signal, wherein the control and evaluation unit is configured to scan at least one induced voltage pulse that is generated by the transmission current pulse at the coil in at least one section from or after the point in time of the application of the transmission current pulse up to the point in time of the complete attenuation of the voltage pulse and to form scan values, whereby the voltage pulse is digitized.