Magnetic Sensor with Opposite Phase AC for Sensitivity
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Solution Overview
Problem
Current magnetic sensors face challenges in enhancing detection sensitivity due to interference from alternating current (AC) magnetic fields with double frequencies, which complicates the detection of magnetic fields from objects.
Innovation Solution
The magnetic sensor employs a configuration with alternating currents having opposite phases applied to different elements, suppressing the double frequency components and enhancing the detection of the primary frequency signal, thereby increasing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If alternating current is applied to magnetic sensor elements, then the sensor can operate and detect magnetic fields, but double frequency components are generated that interfere with detection sensitivity
Solution Approach 1:
The magnetic sensor is divided into multiple elements (first element and second element) with different magnetization orientations. Each element responds differently to the applied alternating current, allowing the double frequency components to be suppressed through differential measurement while maintaining operational capability.
Solution Approach 2:
The first and second magnetic sensor elements are configured with asymmetric magnetization orientations relative to the alternating current direction. This asymmetric configuration causes the elements to generate different double frequency components that can be suppressed through signal processing, thereby improving detection sensitivity without sacrificing operational functionality.
2Speed
If higher frequency AC magnetic fields are used, then detection speed may improve, but double frequency interference becomes more severe
Solution Approach 1:
The magnetic sensor applies alternating current at controlled frequencies to excite the magnetic elements. By using periodic excitation and synchronizing the measurement timing with the excitation cycle, the system can maintain high detection speed while effectively filtering out double frequency interference components through coherent detection methods.
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 effectively suppresses unnecessary double frequency signals, allowing for higher sensitivity in magnetic field detection and easier signal amplification, even in the presence of AC magnetic fields with frequencies up to 100 kHz.
Implementation Method 1
a first element (51) including a first magnetic layer (11), a second element (52) including a second magnetic layer (12)
Data Source
AI summary
According to one embodiment, a magnetic sensor includes first and second elements, first and second interconnects, a first circuit portion electrically connected to the first and second interconnects and a second circuit portion electrically connected to the first and second elements. The first circuit portion supplies a first alternating current to the first interconnect and supplies a second alternating current to the second interconnect. The second circuit portion supplies a first element current to the first element and supplies a second element current to the second element. At a first time, the first alternating current has a first alternating current orientation, and the second alternating current has a second alternating current orientation. At a second time, the first alternating current has an opposite orientation to the first alternating current orientation, and the second alternating current has an opposite orientation to the second alternating current orientation.