Magnetostrictive Sensor Signal Segmentation for Interference
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Solution Overview
Problem
Magnetostrictive sensor apparatuses face limitations in determining the position and movement of magnetic position markers with high accuracy, especially when dealing with overlapping magnetic fields and interference signals, which restricts their application range and measurement precision.
Innovation Solution
The implementation of a data processing device to analyze the time profile of signals from the detector coil device, including digitization of analog signals at high rates, and the use of a comparison device to compensate for echo and interference signals, allowing for accurate determination of position markers' alignment, rotation, and distance, even in overlapping fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple magnetic position markers are used to expand measurement capability, then the application range is improved, but the magnetic fields overlap and cause interference signals that reduce measurement precision
Solution Approach 1:
The patent segments the signal processing into distinct temporal regions: a first evaluation region for measuring signals and a second evaluation region for echo signals. This segmentation allows the system to process multiple position markers simultaneously by evaluating their signals in separate time windows, preventing interference while maintaining the ability to measure multiple markers.
Solution Approach 2:
The patent performs preliminary actions by sending a measuring signal before evaluation and using a ferromagnetic shield device to pre-compenstate for echo signals. The shield device is positioned in advance to deflect echo signals away from the waveguide, preventing interference before it affects measurement precision.
2Measurement precision
If the digitization rate is increased to capture detailed signal shapes, then measurement precision is improved, but device complexity and data processing requirements increase
Solution Approach 1:
The patent applies local quality by using different digitization rates for different temporal regions of the signal. A higher digitization rate is used in the first evaluation region where measuring signals occur to capture precise position data, while a lower digitization rate is used in the second evaluation region for echo signals, reducing overall data processing requirements while maintaining measurement precision where needed.
3Measurement precision
If echo and interference signals are compensated to improve accuracy, then measurement precision is improved, but device complexity increases due to additional compensation mechanisms
Solution Approach 1:
The patent extracts echo signals from the overall signal by evaluating them in a separate second evaluation region. This extraction approach isolates echo signals from measuring signals, allowing for targeted compensation without requiring complex interference cancellation mechanisms across the entire signal spectrum, thus improving accuracy while limiting the increase in device complexity.
Solution Approach 2:
The patent introduces a ferromagnetic shield device as an intermediary element that physically deflects echo signals away from the waveguide. This shield acts as a mediator between the position markers and the waveguide, compensating for echo interference through physical signal deflection rather than complex electronic compensation, thereby improving accuracy with minimal increase in device complexity.
4Measurement precision
If signal evaluation is performed with high resolution to improve measurement accuracy, then measurement precision is improved, but processing time increases
Solution Approach 1:
The patent segments signal evaluation into parallel processes: a first signal evaluation for measuring signals and a second signal evaluation for echo signals. This segmentation allows simultaneous processing of different signal types, reducing overall processing time while maintaining high resolution evaluation for position measurement accuracy.
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 expands the application range of magnetostrictive sensor apparatuses by enabling precise measurement and monitoring, allowing for the use of multiple position markers with overlapping fields, improved accuracy, and flexible resolution settings, while reducing noise and interference, thus enhancing measurement reliability and efficiency.
Implementation Method 1
a detector coil device which is associated with the at least one sensing member
Implementation Method 2
at least one magnetic position marker, at least one sensing member with a waveguide to which the at least one magnetic position marker is contactlessly coupled
Data Source
AI summary
A magnetostrictive sensor apparatus is provided, comprising at least one magnetic position marker, at least one sensing member with a waveguide to which the at least one magnetic position marker is contactlessly coupled, a detector coil device which is associated with the at least one sensing member, a data processing device which determines a time profile with a shape over time of signals of the detector coil device, wherein a recording of the time profile is provided, and an analysis device which analyzes the time profile.