Magnetic Sensor With Piezoelectric Vibration for Noise Suppression
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Solution Overview
Problem
Existing magnetic field sensors face challenges in achieving high sensing precision, particularly in certain frequency ranges due to low frequency noise and limited sensitivity.
Innovation Solution
The sensor design incorporates a deformable film with magnetic layers and an intermediate layer, driven by a driving portion to deform at a specific frequency, and a processor that outputs a signal based on the deformation and magnetic field signals to enhance sensing precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional magnetic field sensor is used, then the device structure is simple, but the sensing precision is low due to 1/f noise and limited sensitivity
Solution Approach 1:
The patent applies mechanical vibration by deforming a piezoelectric body at a specific frequency to modulate the magnetic field detection. The piezoelectric body is driven to vibrate, causing periodic deformation that modulates the resistance of magnetic sensor elements, thereby converting low-frequency magnetic field signals into high-frequency detection signals that avoid 1/f noise
Solution Approach 2:
The patent changes physical parameters by applying AC voltage to the piezoelectric body, causing it to deform at a specific frequency. This parameter change (deformation frequency) modulates the magnetic field interaction with sensor elements, transforming the detection frequency range away from the 1/f noise region and improving measurement precision
2Speed
If the sensor operates at low frequencies, then the response time is fast, but the noise level increases due to 1/f noise
Solution Approach 1:
The piezoelectric body is driven to vibrate at a specific frequency, mechanically modulating the sensor output. This vibration shifts the effective detection frequency away from low frequencies where 1/f noise dominates, while maintaining fast response through the piezoelectric material's inherent rapid deformation capability
Solution Approach 2:
The patent employs periodic action by applying AC voltage to the piezoelectric body, causing it to deform periodically at a specific frequency. This periodic deformation modulates the magnetic field detection signal, effectively shifting the operating frequency range away from the 1/f noise region while maintaining signal fidelity
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 increases sensing precision by suppressing 1/f noise and allowing accurate detection of magnetic fields across a range of frequencies, particularly at higher frequencies.
Implementation Method 1
a piezoelectric body layer; a first sensor portion provided at the piezoelectric body layer
Implementation Method 2
a first magnetic layer, a second magnetic layer provided between the first film and the first magnetic layer
Data Source
AI summary
According to one embodiment, a sensor includes a first film, a first sensor portion, a driving portion, and a processor. The first sensor portion is provided at the first film. The first sensor portion includes a first magnetic layer, a second magnetic layer, and a first intermediate layer. The second magnetic layer is provided between the first film and the first magnetic layer. The first intermediate layer is provided between the first magnetic layer and the second magnetic layer. The driving portion causes the first film to deform at a first frequency. The processor outputs a third signal based on a first signal and a second signal. The first signal relates to the first frequency. The second signal is output from the first sensor portion.