Bistable Magnetic Wire Measurement With Asymmetric Barkhausen Switching
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Solution Overview
Problem
Existing bistable magnetic elements face challenges in reliably measuring physical quantities and positions due to complex magnetic acts occurring in multiple domains, leading to unreliable and noisy measurement results.
Innovation Solution
The system employs an excitation element and bistable magnetic wire positioned asymmetrically, ensuring a distinct magnetic field at each end, allowing for a single Barkhausen jump, and uses a receiving element to interpret the response, focusing on time-based evaluation of signal maxima and minima to suppress noise and secondary effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bistable magnetic wire is used for measurement, then it can respond to physical quantities and position changes, but the measurement results are noisy and unreliable due to complex magnetic acts in multiple domains
Solution Approach 1:
The excitation element is positioned asymmetrically relative to the bistable magnetic wire, creating a non-uniform magnetic field distribution along the wire length. This asymmetry ensures that during magnetization reversal, the Barkhausen jump propagates in a single dominant direction from one end to the other, rather than occurring simultaneously in multiple domains, thereby eliminating the noisy multi-domain magnetic acts and producing clean, interpretable measurement signals
2Ease of operation
If the excitation element is positioned to create a uniform magnetic field, then the magnetic field distribution is symmetric, but this causes complex multi-domain magnetization acts that are difficult to interpret
Solution Approach 1:
The excitation element is deliberately positioned asymmetrically with respect to the bistable magnetic wire, creating a controlled non-uniform magnetic field. This asymmetric field distribution ensures that the magnetization reversal process occurs as a single coherent Barkhausen jump propagating along the wire, producing clear, interpretable measurement signals without the complexity of simultaneous multi-domain magnetization events
3Ease of manufacture
If the bistable magnetic wire is wound into a coil or screw shape, then it can be excited magnetically, but the response evaluation becomes problematic due to complex magnetic acts
Solution Approach 1:
The magnetic wire is configured as a straight element rather than a coiled structure, effectively segmenting the magnetic path into a single linear domain. This linear configuration ensures that the Barkhausen jump propagates sequentially along the wire length in a single direction, producing a clean, easily evaluable response signal that maintains high measurement precision while simplifying the overall 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
This approach achieves repeatable, accurate, and noise-resistant measurements of various physical quantities and positions, enabling precise applications across diverse fields.
Implementation Method 1
the excitation element for generating a magnetic field within range of which the bistable magnetic wire is placed
Implementation Method 2
the bistable magnetic wire is adjusted for magnetization by a single Barkhausen front jump from the first end to the second end or vice versa
Implementation Method 3
The bistable magnetic elements are used for measurement various physical quantities and position, where the bistable magnetic element is formed by a passive member which by its magnetization reacts to a change in position in the magnetic field or to a change in a physical quantity
Data Source
AI summary
The system for physical quantity measurement and/or for position measurement with a bistable magnetic wire (1), which comprises excitation element (2) for creating of magnetic field and a sensing element (3). Within the range of the magnetic field of the excitation element (2), a bistable magnetic wire (1) is placed, which has a first end (11) and an oppositely placed second end (12). The bistable magnetic wire (1) is adjusted for magnetization by a single Barkhausen jump from the first end (11) to the second end (12) or vice versa, wherein the excitation element (2) and bistable magnetic wire (1) are placed in a mutual position with an asymmetric magnetic field with respect to the bistable magnetic wire (1), where the size of the magnetic field excited by the excitation element (2) at the first end (11) is different from the size of the magnetic field excited by the excitation element (2) at the second end (12). The asymmetry of the magnetic field is created due to the mutual asymmetrical position of the excitation element (2) and the bistable magnetic wire (1) and/or due to the asymmetrical construction of the excitation element (2).