Common Cancel Coil for Weak Magnetic Field Detection
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Solution Overview
Problem
Magnetic field detection devices that detect weak magnetic fields without shield rooms have complex circuit configurations and a large number of components due to separate cancel coils for measurement and reference sensors, and additional signal processing requirements.
Innovation Solution
A magnetic field detection device with a common cancel coil for both sensors, positioned to minimize component count and circuit complexity, allowing for detection of weak magnetic fields with reduced components and simplified configuration, and enabling spatial distribution measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate cancel coils are assigned to measurement and reference magnetic sensors, then environmental magnetic field cancellation is achieved, but the number of components increases
Solution Approach 1:
The patent combines the cancel coils for the measurement magnetic sensor and reference magnetic sensor into a single common cancel coil. This single coil generates a cancel magnetic field that simultaneously cancels environmental magnetic fields for both sensors, thereby reducing the total number of components while maintaining effective environmental magnetic field cancellation for both measurement and reference signals.
Solution Approach 2:
The common cancel coil serves multiple functions by generating a cancel magnetic field that acts on both the measurement magnetic sensor and the reference magnetic sensor simultaneously. This multi-functional design allows one component to perform the cancellation task for multiple sensors, reducing overall system complexity and component count.
2Reliability
If cancel coils are assigned to each magnetic sensor, then environmental magnetic field cancellation is achieved, but circuit configuration becomes complex
Solution Approach 1:
The patent merges the cancel coil circuits into a single shared circuit that controls one common cancel coil for both magnetic sensors. This consolidation reduces the number of independent circuit paths, simplifies the overall circuit configuration, and reduces the number of control signals required, while still achieving environmental magnetic field cancellation for both sensors through the common coil.
3Measurement precision
If multiple magnetic sensors are used for spatial distribution measurement, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The common cancel coil provides universal environmental magnetic field cancellation for all magnetic sensors in the array simultaneously. This multi-functional approach allows multiple sensors to be deployed for spatial distribution measurements without each sensor requiring its own dedicated cancel coil, thereby maintaining enhanced measurement capability while controlling overall device complexity through shared cancellation resources.
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 allows for effective detection of weak magnetic fields with reduced components and simplified circuitry, enabling precise spatial distribution measurement without the need for shield rooms.
Implementation Method 1
a cancel coil wound around a winding core part of the bobbin; a feedback circuit that makes a cancel current flow in the cancel coil according to an output signal of the first magnetic sensor to cancel an environmental magnetic field in a cancel space
Implementation Method 2
first and second magnetic sensors fixed to mutually different positions of the bobbin and configured to detect a magnetic field component in mutually the same direction
Data Source
AI summary
To reduce the number of components and simplify the circuit configuration in a magnetic field detection device capable of detecting a weak magnetic field without using a shield room. A magnetic field detection device includes a cancel coil wound around a winding core part of a bobbin, magnetic sensors fixed to mutually different positions of the bobbin, and a feedback circuit that makes a cancel current flow in the cancel coil according to an output signal from the magnetic sensor to cancel the environmental magnetic field in a cancel space. Since the cancel coil is used in common for the magnetic sensors, it is possible to reduce the number of components to be used and to simplify the circuit configuration.