Magnetic Sensor Row Edge Field Optimization
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Solution Overview
Problem
Existing measuring apparatuses for magnetic properties have inaccuracies when measuring across gaps between sensor elements, leading to low measuring accuracy in these areas.
Innovation Solution
A measuring apparatus with a supporting field that generates a magnetic field component pointing in the row direction, with a field strength profile that has no zero crossings or maxima/minima on at least two sensor edges, enhancing sensitivity and accuracy by increasing the field strength near sensor edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sensor elements are arranged in a row with gaps between them for manufacturing reasons, then the device complexity is reduced and manufacturing is easier, but the measurement precision deteriorates in the gap areas
Solution Approach 1:
The patent applies local quality by creating a non-uniform magnetic field distribution where the field strength profile is specifically optimized at sensor element edges. The supporting field apparatus generates a magnetic field with enhanced field strength at the edges of sensor elements, compensating for the manufacturing gaps between elements. This localized field enhancement ensures that each sensor element maintains high sensitivity at its boundaries without requiring continuous sensor coverage, thus resolving the contradiction between ease of manufacture and measurement precision in gap areas.
2Measurement precision
If the field strength profile has a zero crossing near sensor edges, then the sensitivity of sensor elements increases at their edges, but the device complexity increases due to the need for supporting field apparatus
Solution Approach 1:
The patent applies parameter changes by modifying the magnetic field parameters through the supporting field apparatus. Specifically, it creates a field strength profile with controlled zero crossings near sensor edges, which enhances sensor sensitivity. The supporting field apparatus adjusts the magnetic field characteristics (strength distribution, zero crossing positions) to optimize sensor performance. This parameter optimization achieves high edge sensitivity while keeping the supporting field apparatus relatively simple, using permanent magnets or electromagnetic coils arranged to produce the desired field pattern.
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 improves the measuring accuracy by increasing the sensitivity of sensor elements at their edges, allowing for more precise measurement of magnetic properties across gaps between sensor elements.
Implementation Method 1
a supporting field apparatus (50), which generates a magnetic supporting field (80), whose magnetic field component (7), which points in the row direction (10), has a field strength profile (8) in the row direction (10)
Implementation Method 2
The measuring apparatus has magnetoresistive sensor elements (1) arranged next to each other
Data Source
AI summary
Measuring apparatus for measuring magnetic properties of the area surrounding the measuring apparatus with a sensor row comprising at least two magnetoresistive sensor elements, which are arranged in a row that extends in a row direction, and a supporting field apparatus with generates a magnetic supporting field having a magnetic field component which points in the row direction and the field strength of which varies in the row direction, wherein this field strength profile in the row direction does not have a zero crossing and/or a maximum or minimum on at least two sensor edges of the sensor elements which for the sensor row, which sensor edges are arranged after one another in the row direction.