Non-contact Magnetostrictive Sensor for Wire Rope NDT
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Solution Overview
Problem
Existing magnetostrictive sensors for guided wave testing often require a ferromagnetic strip for coupling, which can damage wire ropes or other structures during testing due to the need for a mechanical attachment, and are not suitable for non-ferromagnetic materials.
Innovation Solution
A non-contact magnetostrictive sensor using small permanent magnets with vertical polarization and a simplified coil design, allowing for electromagnetic coupling without a ferromagnetic strip, enabling the propagation and detection of compressional guided waves in wire ropes and other elongated structures without physical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ferromagnetic strip is attached to the material being tested for magnetostrictive sensing, then the sensor effectiveness is improved and non-ferromagnetic materials can be tested, but the mechanical attachment may cause damage to the structure being tested
Solution Approach 1:
The patent replaces the mechanical attachment system (ferromagnetic strip bonding) with an electromagnetic field-based sensing system. The sensor uses electromagnetic induction to generate magnetic fields that interact with the test material without requiring physical contact or mechanical attachment, thereby eliminating the risk of structural damage while maintaining sensing effectiveness
Solution Approach 2:
The patent introduces an electromagnetic field as an intermediary between the sensor and the test material. Instead of direct mechanical contact through ferromagnetic strips, the sensor uses electromagnetic fields to couple with the material, enabling non-contact magnetostrictive sensing that avoids mechanical damage
2Adaptability or versatility
If a ferromagnetic strip is attached to the material being tested, then testing of non-ferromagnetic materials becomes possible, but the device complexity increases due to the additional coupling layer
Solution Approach 1:
The patent replaces the mechanical ferromagnetic strip coupling system with an electromagnetic field-based approach. The sensor uses electromagnetic induction to generate and detect magnetic fields directly in the test material, eliminating the need for ferromagnetic strips and simplifying the sensor structure while maintaining the ability to test non-ferromagnetic materials
Solution Approach 2:
The patent creates a universal sensor design that can test both ferromagnetic and non-ferromagnetic materials without requiring different coupling methods. The electromagnetic field-based approach provides a single, simplified sensor structure that adapts to different material types, eliminating the need for material-specific ferromagnetic strips
3Device complexity
If a contacting sensor is used without ferromagnetic coupling, then no ferromagnetic material is needed, but the sensor cannot effectively test non-ferromagnetic materials
Solution Approach 1:
The patent replaces mechanical contacting sensors with an electromagnetic field-based non-contact sensor. This substitution enables the sensor to interact with both ferromagnetic and non-ferromagnetic materials through electromagnetic induction, providing versatility without requiring physical contact or ferromagnetic coupling layers
Solution Approach 2:
The patent changes the fundamental operating parameter from mechanical contact to electromagnetic field interaction. By using electromagnetic induction to generate and detect magnetic fields, the sensor can effectively test non-ferromagnetic materials that are invisible to traditional magnetostrictive sensors, while maintaining a relatively simple device structure
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 effective non-destructive testing of wire ropes and other structures by generating and detecting compressional waves without mechanical coupling, reducing the risk of damage and allowing for testing of non-ferromagnetic materials, while maintaining sensitivity through electromagnetic coupling.
Implementation Method 1
A non-contact magnetostrictive sensor for generating and detecting compressional waves in a wire rope or other elongated structure without mechanical coupling
Implementation Method 2
A non-contact magnetostrictive sensor using small permanent magnets with vertical polarization and a simplified coil design, allowing for electromagnetic coupling without a ferromagnetic strip
Implementation Method 3
Magnetostriction is a property of ferromagnetic materials that causes them to change shape when subjected to a magnetic field. Magnetostrictive materials can convert magnetic energy into kinetic energy
Implementation Method 4
enabling the propagation and detection of compressional guided waves in wire ropes and other elongated structures without physical contact
Data Source
AI summary
A non contact sensor for use in magnetostrictive testing of a solid ferrous structure. In its simplest form, the sensor has a set of permanent magnets arranged in a row with their poles in the same direction, an electrical coil wrapped around the set of magnets, wrapped in direction parallel to the common poles of the magnets, thereby forming a top portion above the set of magnets and a bottom portion below the set of magnets, and a metal shield interposed between the top portion of the coil and the set of magnets. The sensor is operable such that a time varying current in the coil causes guided waves to travel to the structure and to be reflected from anomalies in the structure even when there is no ferromagnetic coupling material between the sensor and the structure.