Search Coil Sensor Modules for Iron Object Detection
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Solution Overview
Problem
Existing metal detecting systems face challenges in detecting the location, displacement, and movement of objects containing iron without altering the core and coil, which lack a magnetic component, and in preventing detection delays due to non-polarity ranges during pole changes.
Innovation Solution
The system employs sensor modules with sensors having cores and coils that detect induced magnetic fields from objects containing iron, combined with imaging units, impedance matching units, and amplifiers to analyze movement and magnetic flux density, allowing for continuous operation even during non-polarity ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a search coil-type sensor is used to detect objects containing iron, then detection sensitivity is improved, but detection delay occurs during non-polarity ranges when magnetic field subsides temporarily
Solution Approach 1:
The patent combines multiple search coils (first search coil and second search coil) into a single sensor module that detects objects from different spatial positions. When one coil experiences a non-polarity range and temporary magnetic field subsidence, the other coil continues to detect the object, merging their detection capabilities to eliminate detection delays while maintaining high sensitivity.
Solution Approach 2:
The patent ensures continuous detection by having multiple search coils operate simultaneously at different positions. When one coil's magnetic field subsides temporarily during pole changes, the other coil maintains continuous detection, ensuring the useful action of object detection continues without interruption or delay.
2Measurement precision
If multiple sensor modules are deployed to track multiple objects, then measurement accuracy and coverage are improved, but device complexity increases
Solution Approach 1:
The patent divides the detection system into multiple independent sensor modules, each containing search coils and capable of detecting objects independently. This segmentation allows the system to track multiple objects simultaneously with high accuracy while keeping each module's structure simple and manageable, reducing overall system complexity through modular design.
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 configuration enables ultra-low power detection of fine magnetic field changes, allowing for accurate location and displacement tracking of objects containing iron, while maintaining continuous operation and improving measurement speed and accuracy.
Implementation Method 1
the coil is wound around a portion of an outer circumferential surface of the housing, the portion corresponding to a position of the core; The sensor modules have respective induced magnetic fields formed due to a change in distance from the objects containing iron (Fe)
Data Source
AI summary
A metal detecting system using search-coil type sensor includes sensor modules that detect respective objects which move around the corresponding sensor modules, each sensor module having one or more sensors that include respective housings having respective inner spaces, respective cores formed to be inserted into the inner spaces of the housings, and respective coils which are each wound around a portion of an outer circumferential surface of each of the housings, the portion corresponding to a position of each of the cores; imaging units that image the respective objects that move around the corresponding sensor modules and image respective persons possessing the respective objects; impedance matching units that are connected to a plurality of the sensor modules, respectively, and perform impedance matching; and amplifiers that are connected to the impedance matching units, respectively, and amplify a fine current and voltage generated during approach of the objects to the sensor modules.