Movable Coil Scanner for Calibrated Magnetic Field Mapping
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Solution Overview
Problem
Conventional magnetic field generation systems, such as those used in MRI and calibration, are limited by fixed-coil configurations and lack direct magnetic field feedback, making it difficult to generate controlled and calibrated magnetic fields over large volumes, particularly for testing vehicles where precise magnetic immunity is required.
Innovation Solution
A system comprising a pair of movable coils with independent translators and a controller to generate and calibrate a combined magnetic field over a large scanning volume, allowing for free space field sensing and precise control of the magnetic field across the volume, enabling testing of vehicles without moving the device under test.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If fixed-coil configurations are used, then the system structure is simple, but the scanning volume is limited and field control precision is poor
Solution Approach 1:
The patent employs movable coils that can be dynamically positioned along transport rails using translators, replacing fixed coil configurations. This dynamic positioning enables the system to scan large volumes while maintaining controlled magnetic field generation, directly resolving the contradiction between scanning volume and system complexity.
Solution Approach 2:
The system divides the magnetic field generation into multiple segments by using multiple coils that can be independently positioned and controlled. Each coil segment can be moved to different locations along the scan path, enabling large volume scanning while keeping individual coil components manageable in size and complexity.
2Measurement precision
If conventional MRI systems are used, then magnetic field generation is achieved, but direct magnetic field feedback is lacking and field calibration is imprecise
Solution Approach 1:
The patent incorporates Hall effect sensors that provide direct magnetic field feedback to the controller. This feedback mechanism enables real-time monitoring and precise calibration of the magnetic field strength, allowing the system to adjust coil positioning and current delivery to achieve accurate field calibration without requiring complex external measurement systems.
3Productivity
If the device under test is moved through the coil, then magnetic field exposure is achieved, but testing time increases and operational complexity increases
Solution Approach 1:
Instead of moving the device under test through a fixed coil, the patent inverts the approach by moving the coil through the stationary device under test. This inversion eliminates the need for complex positioning systems for the test object while maintaining the magnetic field exposure requirement, thereby improving productivity and ease of operation.
Solution Approach 2:
The movable coil system dynamically positions coils along transport rails to scan different regions of the stationary device under test. This dynamic approach replaces the need for moving the entire device through a fixed coil, reducing operational complexity while maintaining testing effectiveness.
4Volume of moving object
If large coils are used to cover large volumes, then scanning volume increases, but magnetic field strength and frequency response decrease
Solution Approach 1:
The system uses multiple smaller coils instead of one large coil to cover the scanning volume. Each smaller coil maintains better frequency response and magnetic field strength characteristics, while the collection of coils collectively provides coverage of the entire large volume through coordinated movement and positioning.
Solution Approach 2:
By using movable coils that can be dynamically positioned, the system maintains optimal coil-to-device distances for good frequency response while achieving large volume coverage through motion. This dynamic approach allows small, high-performance coils to effectively scan large volumes rather than requiring one large coil with compromised performance.
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 solution provides a controlled and calibrated magnetic field over large volumes, ensuring high magnetic immunity testing capabilities, allowing for precise magnetic field mapping and testing of vehicles in a stationary setup with improved frequency response and field uniformity.
Implementation Method 1
a first coil configured to generate a first magnetic field... a second coil configured to generate a second magnetic field... the first magnetic field and second magnetic field combine to form a combined magnetic field
Data Source
AI summary
A system, such as a magnetic immunity testing system, can include a first coil configured to generate a first magnetic field. The first coil can be disposed on a first side of a scanning volume and can have a first feed for supplying electric current to the first coil. A second coil can be similarly configured on an opposite side of a scanning volume, and a second magnetic field from the second coil can be combined with the first magnetic field to form a combined magnetic field. The coils can be provided with transporters that translate coils in at least one dimension. The system can also include a controller that is configured to control the transporters and the feeds to provide the combined magnetic field as a controlled and calibrated magnetic field over the scanning volume.