SQUID Sensor with Serpentine Track for Self-Induced Field Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing magnetic field detection devices using SQUID systems face challenges in compactness due to self-induced magnetic fields, which cannot be effectively compensated by large coils, especially in circuits with multiple segments, leading to measurement errors and reduced performance.
Innovation Solution
A magnetic field detection device with a serpentine conductive track design featuring input, intermediate, and output portions with strategically arranged SQUID devices, where the input and output portions generate corrective magnetic fields to compensate for self-induced fields, significantly reducing residual magnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If large-diameter coils are used to compensate self-induced magnetic fields, then magnetic field uniformity is improved, but device size increases
Solution Approach 1:
The patent extracts the magnetic field compensation function from external large coils and relocates it to the conductive track itself by adding input and output portions that generate corrective magnetic fields locally, thereby eliminating the need for large external coils while maintaining field uniformity
Solution Approach 2:
The patent nests the magnetic field compensation mechanism within the conductive track structure by integrating input and output portions that contain SQUID devices, allowing the compensation function to be embedded within the existing device geometry rather than requiring external components
2Measurement precision
If multiple SQUID devices are used to improve detection performance, then measurement precision is improved, but self-induced magnetic field interference increases
Solution Approach 1:
The patent converts the harmful self-induced magnetic fields generated by multiple SQUID devices into a beneficial effect by designing input and output portions that generate corrective magnetic fields, transforming the interference problem into a solution where the same bias current produces both detection and compensation functions
Solution Approach 2:
The patent merges the detection function and compensation function into a single integrated system where the conductive track with SQUID devices performs both magnetic field detection and self-induced field compensation simultaneously, eliminating the need for separate compensation mechanisms
3Device complexity
If symmetric SQUID device arrangement is used, then device simplicity is improved, but self-induced magnetic field compensation becomes impossible in multi-segment circuits
Solution Approach 1:
The patent introduces asymmetry into the conductive track design by adding input and output portions with specific geometries and SQUID device arrangements that are not symmetric, enabling these portions to generate corrective magnetic fields that compensate for self-induced fields in multi-segment circuits while maintaining overall device functionality
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 device achieves a 99% reduction in self-induced magnetic field interference, enabling more accurate and compact magnetic field detection without the need for large coils, thus improving detection performance and usability in various applications.
Implementation Method 1
The bias current induces a magnetic field which is generated by the Josephson junctions of the SQUID device, called self-induced magnetic field or stray magnetic field
Implementation Method 2
superconducting quantum interference device, more often referred to by the English acronym SQUID, which stands for 'Superconducting QUantum interference Device' for the detection of magnetic fields
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to a device (10) for sensing a magnetic field, comprising a circuit (12) capable of being traversed by a bias current (Ip), the circuit (12) comprising at least one conductor track (16) capable of being traversed by the bias current (Ip), the conductor track (16) having the form of a coil, the conductor track (16) comprising: an input portion (34), an output portion (36), and an intermediate portion (38) positioned between the input portion (34) and the output portion (36), the intermediate portion (38) comprising a plurality of magnetic field sensing elements (40), the input portion (34) and the output portion (36) being free of magnetic field sensing elements (40).