Rotating Magnetostrictive Sensor Probe for Omnidirectional Plate Inspection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional magnetostrictive sensor (MsS) plate sensors require incremental movement across the surface of plate structures for effective testing, limiting coverage and efficiency in nondestructive testing of large areas.
Innovation Solution
Development of omnidirectional MsS probes with rotating sensors that maintain constant acoustic coupling and protection from damage, allowing for large-area testing without position changes, using a thin-wall metal cup and shear wave couplant for efficient energy transmission and mechanical protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional MsS plate sensors are used for testing, then directional sensors can be arranged in a circular configuration to maximize coverage, but incremental movement of the sensor across the surface of the plate is required which limits coverage efficiency and increases testing time
Solution Approach 1:
The patent applies the dynamics principle by making the sensor rotatable rather than fixed in position. The MsS sensor is mounted on a rotatable platform that can sweep through multiple angular positions, allowing the sensor to dynamically change its orientation while maintaining a stationary base position. This dynamic capability enables omnidirectional coverage without requiring incremental movement of the entire sensor assembly across the plate surface, thereby resolving the contradiction between coverage area and testing time.
Solution Approach 2:
The patent introduces angular rotation as an additional dimension of operation. Instead of moving the sensor linearly across the plate surface in one dimension, the sensor rotates in the angular dimension while remaining at a fixed radial position. This dimensional change allows the sensor to access multiple directional sectors around the inspection point, achieving comprehensive coverage without increasing the physical travel distance or time required for testing.
2Productivity
If the sensor is rotated to achieve omnidirectional coverage, then large-area testing can be performed without position changes, but maintaining constant acoustic coupling and protecting the sensor from damage becomes challenging
Solution Approach 1:
The patent introduces an intermediary coupling mechanism between the rotating sensor and the plate surface. A couplant is applied to the interface between the sensor and the plate, serving as a mediator that maintains acoustic coupling during rotation. This intermediary substance compensates for minor variations in contact pressure and surface irregularities that occur during rotational movement, ensuring stable acoustic coupling throughout the omnidirectional scanning process.
Solution Approach 2:
The patent employs a flexible coupling interface that can accommodate the rotational motion of the sensor. The coupling mechanism uses compliant materials or flexible elements that can adapt to the changing orientation of the sensor during rotation, maintaining consistent acoustic contact with the plate surface. This flexibility ensures that acoustic coupling remains stable despite the dynamic rotational movement, resolving the reliability concern.
3Adaptability or versatility
If a rotating sensor mechanism is implemented, then omnidirectional coverage is achieved, but the device complexity increases with additional components for rotation and protection
Solution Approach 1:
The patent designs the rotating platform to serve multiple functions simultaneously. The same rotational mechanism that enables omnidirectional sensor orientation also provides protection for the sensor elements during rotation and positioning. By integrating these functions into a single multi-functional assembly, the patent minimizes the number of separate components required, thereby reducing overall device complexity while achieving adaptability.
Solution Approach 2:
The patent merges the sensor mounting structure with the rotational mechanism and protection housing into an integrated assembly. Rather than having separate components for sensor mounting, rotation actuation, and protection, these elements are combined into a unified probe structure. This merging reduces the number of interfaces and assembly steps required, simplifying the overall device while maintaining omnidirectional coverage capability.
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 efficient, high-frequency, and high-signal-to-noise-ratio (SNR) nondestructive testing of large plate structures with omnidirectional coverage, capable of detecting anomalies over extended distances and varying surface conditions, including elevated temperatures.
Implementation Method 1
The principle of magnetostriction is based on either shifting or oscillation/rotation between magnetic domains in the material due to applied magnetic fields. Typically, a permanent magnetic field is used to give the domains a preferred orientation. Variable magnetic fields are also applied to initiate the rotation of the domains causing the dimensional changes.
Implementation Method 2
omnidirectional MsS probes with rotating sensors that maintain constant acoustic coupling and protection from damage, allowing for large-area testing without position changes, using a thin-wall metal cup and shear wave couplant for efficient energy transmission and mechanical protection
Data Source
AI summary
A guided wave probe for use in guided wave testing of plate structures. The probe comprises a cup having a flat or nearly flat bottom, and a guided wave sensor, such as a magnetostrictive sensor, placed in the bottom of the cup. The sensor and/or cup are coupled to the plate structure, such that ultrasonic energy from the sensor is transmitted to the cup and the plate surface. The sensor is incrementally rotated in the cup, and sensor data is acquired at each incremental position.