Magnetic Field Compensation with Integrated Sensor and Shielding
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Solution Overview
Problem
Conventional magnetic field compensation devices with hybrid systems face challenges due to crosstalk between flux gate sensors and coil sensing elements, leading to undesired frequency components and a bulky structural shape.
Innovation Solution
A compact magnetic field compensation device utilizing a single triaxial magneto resistive sensor with two measuring amplifier loops, one analogue and one digital, allowing for parallel operation or switching between them, and integrated with low-noise electronics to process signals from DC to 170 kHz, minimizing crosstalk and reducing size and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If hybrid systems with both coil sensing elements and flux gate sensors are used, then measurement precision is improved, but device complexity and size increase due to crosstalk and the need for accurate arrangement
Solution Approach 1:
The patent combines both coil sensing elements and flux gate sensors into a single integrated sensor unit with a common housing. This merging allows the sensors to work together in close proximity without requiring complex arrangement, while the housing provides shielding to minimize crosstalk between the different sensor types, thus achieving improved measurement precision without proportionally increasing device complexity
Solution Approach 2:
The housing structure serves as an intermediary element that physically separates and shields the coil sensing elements from the flux gate sensors. This intermediary structure minimizes the crosstalk of chopper frequency to the coils while maintaining a compact form factor, resolving the contradiction between using multiple sensor types and managing their spatial arrangement
2Volume of moving object
If flux gate sensors are placed close to coil sensing elements, then device size is reduced, but crosstalk increases causing undesired frequency components
Solution Approach 1:
The patent acknowledges the inevitable crosstalk that occurs when sensors are placed in close proximity, but converts this harmful effect into a manageable parameter by designing the housing with specific shielding characteristics. The housing is engineered to attenuate the chopper frequency crosstalk to acceptable levels, allowing compact sensor arrangement while controlling the harmful frequency components
Solution Approach 2:
The patent changes the physical parameters of the housing structure, particularly its material properties and geometric configuration, to optimize the shielding effect. By adjusting these parameters, the housing effectively reduces crosstalk between sensors while maintaining a compact volume, thus resolving the contradiction between size reduction and crosstalk minimization
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
The solution enables efficient magnetic field compensation with reduced size and weight, minimizing crosstalk and achieving effective signal processing across a broad frequency range, thereby improving the compactness and performance of magnetic field compensation systems.
Implementation Method 1
The operating mode of a magneto resistive sensor is based on magneto resistive effects. In case of these effects, by applying an external magnetic field, the electrical resistance of a material varies proportionally to the amplitude of the field.
Implementation Method 2
Particularly, the anisotropic magneto resistive effect (AMR effect), the 'gigantic' magneto resistive effect (GMR effect), the CMR effect, the TMR effect, and the planar Hall effect are among the magneto resistive effects.
Implementation Method 3
With this in mind, it is distinguished between magneto resistive effects in non-magnetic material (Hall effect), in magnetic material (e.g. AMR effect), and in hybrid material consisting of non-magnetic and magnetic materials (e.g. GMR effect, CMR effect).
Implementation Method 4
a single magneto resistive sensor, to which at least two measuring amplifier loops are assigned, i.e. circuits for amplifying the measured signals
Implementation Method 5
the measured signal is passed as a control signal to Helmholtz coils, the locations of which minimize the interference field amplitude at the spot of the sensor by emitting a magnetic compensation field
Data Source
AI summary
A device for compensating magnetic fields, comprising a single magneto resistive sensor to which at least two parallel measuring amplifier loops are connected in series, one being an analogue broadband controller loop and the other being a digital broadband controller loop.