Magnetoelectric Magnetic Field Sensing via Resonant Feedback Frequency
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Solution Overview
Problem
Existing magnetic field sensors based on magnetoelectric sensors require time-consuming and complex methods for evaluating resonant frequency and amplitude to achieve precise detection, leading to inefficiencies in measurement accuracy and duration.
Innovation Solution
A magnetic field sensor with a magnetoelectric sensor element that induces mechanical oscillations using an excitation signal, converts these oscillations into a reception signal, and determines the magnetic field variable based on the frequency of the reception signal, utilizing a feedback resonant circuit and phase control to ensure precise evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If time-consuming and complex methods are used for evaluating resonant frequency and amplitude, then measurement accuracy is improved, but measurement duration increases
Solution Approach 1:
The patent replaces complex mechanical evaluation methods with a simplified electrical evaluation approach. By using the magnetoelectric sensor element's electrical response characteristics to directly determine magnetic field variables, the system avoids time-consuming mechanical resonance frequency and amplitude measurements while maintaining measurement accuracy.
Solution Approach 2:
The patent changes the evaluation parameter from mechanical resonance frequency and amplitude to electrical response characteristics. This parameter transformation enables rapid measurement by utilizing the sensor element's electrical properties, which can be evaluated much faster than mechanical oscillation parameters.
2Measurement precision
If complex evaluation methods are used for determining magnetic field variables, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical evaluation systems with a simplified electrical evaluation system. By utilizing the magnetoelectric sensor element's inherent electrical response to magnetic fields, the system achieves accurate measurements without requiring complex mechanical resonance analysis equipment or procedures.
Solution Approach 2:
The magnetoelectric sensor element serves dual functions: it both senses the magnetic field and provides its own evaluation signal through its electrical response characteristics. This self-service capability eliminates the need for separate complex evaluation systems, reducing overall device complexity while maintaining measurement accuracy.
3Measurement precision
If mechanical oscillations are induced for magnetic field detection, then measurement sensitivity is improved, but energy consumption increases
Solution Approach 1:
The patent replaces energy-intensive mechanical oscillation induction with a low-energy electrical evaluation method. By measuring the magnetoelectric sensor element's electrical response characteristics under magnetic field influence, the system achieves high measurement sensitivity without the continuous energy input required to sustain mechanical oscillations.
Solution Approach 2:
Instead of continuous mechanical oscillation induction that consumes energy, the patent uses periodic or aperiodic electrical measurement of the sensor element's response characteristics. This approach maintains measurement sensitivity by capturing the sensor's natural response to magnetic fields without requiring continuous energy input for mechanical actuation.
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
Enables rapid and accurate detection of magnetic fields by simplifying the evaluation process, increasing measurement accuracy, and enhancing energy efficiency through resonant oscillations.
Implementation Method 1
Magnetostrictive materials are characterized in that a deformation of the material occurs as a result of an applied magnetic field
Implementation Method 2
Piezoelectric materials are characterized by the change in electrical polarization and thus the occurrence of a voltage as a result of elastic deformation
Implementation Method 3
Magnetoelectric sensors are used to detect magnetic fields and are based on the mechanical force coupling of magnetostrictive and piezoelectric materials
Data Source
AI summary
The present invention relates to a magnetic field sensor for detecting a magnetic field, comprising: a magnetoelectric sensor element which can mechanically oscillate, the sensor element having at least one first layer made of a magneto-restrictive material, a second layer made of a piezoelectric material, and at least one electrode made of an electrically conductive material, more particularly metal; and electronics. The magnetic field sensor, more particularly the electronics, is designed to induce mechanical oscillations of the sensor element by means of an excitation signal, to receive the mechanical oscillations of the sensor element and to convert said mechanical oscillations into a reception signal, to produce the excitation signal from the reception signal, and to determine a variable related to the magnetic field on the basis of the reception signal.