Magnetoresistive Sensor Arrangement for High-Resolution Position Sensing
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Solution Overview
Problem
Current position sensors, such as those based on optics, capacitors, inductive coils, and thermo-electric sensors, fail to provide high bandwidth and high resolution at micro-scales for nanoscale applications, while magnetoresistive sensors suffer from limited scalability and sensitivity in macro-structures.
Innovation Solution
A sensor arrangement comprising two magnetoresistive elements and a magnetic field source with orthogonal dipole axis, allowing for high gradient and low strength magnetic fields to be applied, enabling precise position sensing by combining or subtracting output signals from the magnetoresistive elements to determine object position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical, capacitor or inductive coil sensors are used for position sensing, then high bandwidth and high resolution are achieved, but they do not scale down to micro-scales for use in micro-structures
Solution Approach 1:
The patent replaces optical, capacitive, or inductive sensing mechanisms with a magnetoresistive sensing system. The measurement unit detects position changes by monitoring resistance variations in magnetoresistive elements subjected to magnetic fields, eliminating the need for optical components or electromagnetic coils that cannot be miniaturized effectively.
Solution Approach 2:
The patent utilizes changes in electrical resistance parameters of magnetoresistive elements in response to magnetic field variations. By measuring resistance changes rather than optical or electromagnetic parameters, the system achieves both high resolution and micro-scale compatibility, as electrical properties can be precisely measured at small dimensions.
2Adaptability or versatility
If thermo-electric position sensors are used, then scaling down to micro-scale is achieved, but resolution and bandwidth are reduced
Solution Approach 1:
The patent substitutes thermo-electric sensing with magnetoresistive sensing. Instead of measuring temperature gradients or thermoelectric voltages, the system measures electrical resistance changes in magnetoresistive elements, providing both micro-scale compatibility and high resolution through precise electrical measurements.
Solution Approach 2:
The system monitors electrical resistance parameters of magnetoresistive elements rather than thermal parameters. This parameter change enables high-resolution measurements at micro-scales, as electrical resistance can be measured with high precision using standard micro-electronic techniques, unlike thermal measurements which have inherent limitations at small dimensions.
3Adaptability or versatility
If magnetoresistive sensors are used, then position sensing is achieved, but sensitivity is limited in macro-structures
Solution Approach 1:
The patent divides the sensing system into multiple magnetoresistive elements arranged in specific configurations. By segmenting the sensing area and using multiple elements, the system achieves both macro-structure coverage and high sensitivity through differential measurements that amplify small position changes.
Solution Approach 2:
The patent combines multiple magnetoresistive elements with a magnetic field source in an integrated arrangement. The measurement unit processes signals from multiple elements simultaneously, merging their outputs to achieve enhanced sensitivity and extended measurement range for macro-structure applications.
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 configuration achieves high resolution and bandwidth position sensing, with sensitivity and linearity over a wide range, suitable for both micro- and macro-scale applications, including nanoscale science and engineering.
Implementation Method 1
A known position sensing concept is based on the property of magnetoresistance (MR). Magnetoresistance is the property an electrical resistance of a conductive layer sandwiched between ferromagnetic layers changes as a function of a magnetic field applied to the layers.
Data Source
AI summary
A method for determining of a position of an object using a sensor arrangement that includes a first magnetoresistive element and a second magnetoresistive element. A source provides a magnetic field with first and second magnetic poles. The source is arranged between the first magnetoresistive element and the second magnetoresistive element with the first magnetic pole facing the first magnetoresistive element and the second magnetic pole facing the second magnetoresistive element. The first magnetoresistive element is arranged in the magnetic field and provides a first output signal dependent on a position of the first magnetoresistive element relative to the magnetic field source. The second magnetoresistive element is arranged in the magnetic field and provides a second output signal dependent on a position of the second magnetoresistive element relative to the magnetic field source. A measurement unit determines a position of the magnetic field source relative to the first and the second magnetoresistive elements dependent on the first output signal and the second output signal.