Ferromagnetic Inclusion Detector With Perpendicular Sensing Coils
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Solution Overview
Problem
Current metal detection systems for continually passing media, such as belt conveyors, face challenges in sensitivity, localization accuracy, and interference suppression, making them unsuitable for continuous detection and localization of ferromagnetic inclusions.
Innovation Solution
A detector and localizer system comprising a primary exciting coil and multiple sensing coils arranged perpendicular to it, with additional secondary exciting coils for calibration and signal processing, utilizing harmonic waveform generators and amplifiers to enhance detection and localization accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional metal detection systems are used for continually passing media, then detection can be performed, but localization accuracy and sensitivity are insufficient
Solution Approach 1:
The detection system is segmented into multiple sensing coils (first sensing coil, second sensing coil, third sensing coil) arranged at different positions and orientations. Each coil contributes to detecting signals from different spatial locations, enabling precise localization of ferromagnetic inclusions through signal differentiation and comparison.
Solution Approach 2:
Different sensing coils are positioned to detect local magnetic field variations at specific locations. The first sensing coil detects along the movement direction, the second sensing coil detects perpendicular to the movement direction, and the third sensing coil provides additional spatial reference, creating localized detection zones that together achieve comprehensive 3D localization.
2Measurement precision
If multiple sensing coils are used to improve localization accuracy, then detection precision increases, but device complexity increases
Solution Approach 1:
The sensing coils are arranged asymmetrically with respect to the primary exciting coil and the movement direction. The first sensing coil is positioned to detect signals primarily along the movement direction, while the second sensing coil detects signals perpendicular to the movement direction, creating an asymmetric detection geometry that optimizes localization capability.
Solution Approach 2:
The detection system transitions from 2D plane detection to 3D spatial detection by adding the third sensing coil and arranging coils at different orientations. This dimensional expansion enables accurate localization of ferromagnetic inclusions in three-dimensional space rather than limited to a single plane.
3Ease of operation
If the detection system is made portable for localization, then flexibility improves, but continual detection on belt conveyors becomes unsuitable
Solution Approach 1:
The detection system is designed with a fixed installation configuration that serves multiple functions: detecting ferromagnetic inclusions, localizing their positions in three-dimensional space, and operating continuously on belt conveyors. The system combines the capabilities of portable locators with the productivity of fixed installation, making it universally applicable to continual detection scenarios.
4Object-affected harmful factors
If transmitter coils are arranged to cancel mutual interaction, then interference is reduced, but the system requires complex control connections for current control
Solution Approach 1:
The patent extracts and eliminates the problematic mutual interaction between transmitter and receiver coils by using separate, non-overlapping coil arrangements. The sensing coils are positioned and oriented such that they detect the magnetic field generated by the primary exciting coil without significant mutual coupling, thereby removing the need for complex cancellation control connections.
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 system achieves more accurate detection and localization of ferromagnetic inclusions within magnetically transparent materials, improving sensitivity and adaptability to ambient conditions while minimizing interference.
Implementation Method 1
a primary exciting coil (A) that the medium (M) passes through
Implementation Method 2
at least two sensing coils (B1 to Bn), the sensing coils are arranged on a plane perpendicular to the plane of the primary exciting coil (A)
Data Source
Figure 1
Figure 2
AI summary
A detector and localizer of ferromagnetic inclusions in a continually passing medium (M), comprising a primary exciting coil (A) that the medium (M) passes through, and further comprising at least two sensing coils (B1 to Bn). The sensing coils (B1 to Bn) are arranged on a plane perpendicular to the plane of the primary exciting coil (A) and all the sensing coils (B1 to Bn) are wound in any direction, while at least one secondary exciting coil (C) being arranged on the plane of the sensing coils (B1 to Bn).