Proximity Switch Threshold Selection for Multi-Metal Detection
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Solution Overview
Problem
Traditional proximity switches face challenges in maintaining high sensitivity for detecting objects with different metals, as the sensitivity is not optimized when multiple metals are present, and the detection range is not stable, leading to inconsistent detection results.
Innovation Solution
A proximity switch with a detection part, comparison part, and threshold setting part that allows for the selection of thresholds specific to each metal type, enabling high sensitivity detection by comparing physical quantities such as amplitude or frequency with metal-type corresponding thresholds, and outputting detection signals when the object is within the specific range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single oscillation frequency is set to achieve the same change rate relative to multiple metals, then the device can detect multiple metal types, but the sensitivity cannot be optimized for any specific metal type
Solution Approach 1:
The patent applies dynamics by making the oscillation frequency adjustable rather than fixed. The frequency adjustment unit allows the oscillation frequency to be dynamically changed based on the detected metal type, enabling the system to optimize sensitivity for each specific metal while maintaining the ability to detect multiple metal types.
Solution Approach 2:
The patent changes the physical parameter of oscillation frequency based on the detected metal type. By adjusting the oscillation frequency parameter according to the specific metal being detected, the system achieves high sensitivity for each metal type while maintaining versatility across multiple metal types.
2Adaptability or versatility
If the detection range is extended to cover multiple metal types, then the versatility of the device is improved, but the stable detection range becomes inconsistent across different metals
Solution Approach 1:
The patent uses dynamic adjustment of oscillation frequency to maintain reliable detection across different metal types. By adapting the frequency to each metal type, the system ensures that the detection range remains stable and consistent for each specific metal, even while covering multiple metal types overall.
3Measurement precision
If the oscillation frequency is adjusted to optimize detection for a specific metal type, then the detection sensitivity is improved, but the device cannot effectively detect other metal types
Solution Approach 1:
The patent implements dynamic frequency adjustment that allows the system to optimize for a specific metal type during detection while maintaining the capability to detect other metal types by changing the frequency. The frequency adjustment unit enables this dynamic adaptation based on the detected object's properties.
Solution Approach 2:
The patent achieves multi-functionality by combining a base oscillation circuit with a frequency adjustment unit. This universal detection system can function optimally for different metal types by adjusting the oscillation frequency, making the single device capable of high-sensitivity detection across multiple metal types.
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 solution allows for precise detection of objects within specific ranges with high sensitivity, even when multiple metals are involved, by using metal-type specific thresholds, ensuring accurate detection and minimizing errors.
Implementation Method 1
the oscillation circuit oscillates to generate a high frequency, and due to the proximity of the detected object containing metal, the amplitude of the high frequency is attenuated or an oscillation frequency is increased
Data Source
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AI summary
The present invention provides a proximity switch, which can detect whether a detected object containing multiple metals exists in a specific range. The induction type proximity switch includes: an oscillation switch of which the amplitude is attenuated due to the proximity of the detected object containing metal, so as to detect the excessive proximity of the detected object; a detection circuit for detecting the amplitude of a high frequency generated by the oscillation of the oscillation circuit; an operation and comparison part for comparing the detected amplitude of the high frequency with the threshold set for the amplitude, i.e., a boundary as the excessive proximity, and outputting a detection signal of the excessive proximity when the detected amplitude is under the threshold; and a threshold setting part, for selecting a threshold corresponding to a designated metal type according to the designation on the metal type from the outside.