Motorized Scanner with Magnetostrictive EMAT Sensor
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Solution Overview
Problem
Existing non-destructive inspection methods for metallic and non-metallic structures using magnetostrictive EMAT sensors are limited by the need for adhesives or pressure-coupling of magnetostrictive strips, which restricts scanning flexibility and applicability to structures with rough surfaces or extreme temperatures, and require multiple sensors and collars for round structures.
Innovation Solution
A motorized scanner with a built-in magnetostrictive EMAT sensor and strip that moves to various positions, applying pressure using magnetic or vacuum forces, allowing for localized ultrasonic readings without adhesives, and can be used on ferromagnetic and non-magnetic materials, with optional malleable coupling layers for enhanced contact on rough surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesives or pressure-coupling of magnetostrictive strips are used, then ultrasonic readings can be obtained, but scanning flexibility is restricted and applicability to structures with rough surfaces or extreme temperatures is limited
Solution Approach 1:
A malleable coupling layer is introduced as an intermediary between the magnetostrictive strip and the structure being inspected. This coupling layer adapts to rough surfaces and maintains effective acoustic coupling without requiring adhesives, enabling reliable ultrasonic readings on structures with varying surface conditions including rough surfaces and extreme temperatures.
Solution Approach 2:
The system changes the physical state and properties of the coupling material from rigid adhesive to malleable material that can deform and adapt. This parameter change allows the coupling layer to conform to various surface geometries and maintain contact under different temperature conditions, thereby improving both reliability and adaptability.
2Reliability
If multiple sensors and collars are used for round structures, then complete coverage is achieved, but device complexity and the need for multiple components increases
Solution Approach 1:
A single scanner unit is designed with a magnetostrictive strip that can be positioned and pressure-coupled at multiple locations around round structures. The scanner integrates positioning, pressure application, and ultrasonic sensing functions in one device, eliminating the need for multiple separate sensors and collars while maintaining complete coverage capability.
Solution Approach 2:
The system transitions from static multiple sensors fixed on a collar to a dynamic single scanner that can move and reposition itself around the structure. The scanner applies pressure dynamically at different positions and can be moved to achieve complete coverage, reducing the number of physical components needed.
3Adaptability or versatility
If a scanner moves to multiple positions and applies pressure at each location, then flexible inspection is enabled, but inspection time and positioning precision requirements increase
Solution Approach 1:
The magnetostrictive strip is pre-positioned on the scanner before inspection begins. The scanner moves to predetermined positions around the structure, and pressure is applied only when needed for reading acquisition. This preliminary preparation reduces the time spent on positioning and setup during the actual inspection process.
Solution Approach 2:
The scanner is designed to maintain continuous movement and readiness to inspect, with the magnetostrictive strip already in place. By eliminating the need for repeated attachment and setup at each position, the system maintains continuous useful action throughout the inspection, reducing total inspection time while preserving flexibility.
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 flexible, efficient, and accurate non-destructive inspection of structures by allowing the scanner to move freely and apply pressure at multiple positions, reducing the need for multiple sensors and adhesives, and enabling inspections at various temperatures and on complex geometries, with precise positioning for image creation.
Implementation Method 1
ultrasound generated with magnetostrictive EMAT technique
Implementation Method 2
at least one biasing magnetic field
Implementation Method 3
The scanner can use magnetic forces to attach to ferromagnetic materials
Implementation Method 4
or vacuum forces to scan non-magnetic materials
Implementation Method 5
An optional layer of malleable material can be added under the magnetostrictive strip to enhance coupling on structures with rough surfaces
Data Source
AI summary
A system comprising a motorized scanner, a magnetostrictive EMAT sensor, and a mechanism to pressure-couple the sensor against the structure that is going to be ultrasonically inspected. The magnetostrictive EMAT sensor includes a magnet or magnets to provide a biasing field, an EMAT RF coil or coils to generate the RF field, a magnetostrictive strip under the coil or coils where the ultrasound is generated. Different magnet and coil configurations can be used to generate guided waves, such as shear horizontal and lamb waves, or bulk waves at different angles. The motorized scanner moves the sensor on the structure and stops at the desired inspection locations based on position readings. Once in position, a built-in device applies downward pressure on the sensor to pressure couple the magnetostrictive strip against the structure so the ultrasound can propagate within this structure and ultrasonic readings can be taken.