SQIF Bias Coil Feedback for Mobile Magnetic Signal Detection
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Solution Overview
Problem
Existing technologies face challenges in detecting electromagnetic signals while a detector is moving with changing orientation relative to the Earth's magnetic field, as they struggle to maintain a stable operating point and effectively filter out low-frequency components of the Earth's magnetic field, leading to interference with high-frequency signal detection.
Innovation Solution
A circuit incorporating a Superconducting Quantum Interference Array (SQIF) and a bias circuit that generates a bias magnetic field using a coil, providing nullifying feedback to counterbalance the low-frequency portion of the external magnetic field, allowing the SQIF to detect high-frequency electromagnetic signals by maintaining an optimal operating point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the detector moves with changing orientation relative to the Earth's magnetic field, then the detector can operate in mobile environments, but the low-frequency portion of the external magnetic field interferes with high-frequency signal detection
Solution Approach 1:
The patent implements a feedback mechanism where the bias circuit continuously monitors the output voltage of the SQIF and adjusts the bias current through the coil to counterbalance low-frequency magnetic field components. This feedback loop enables the system to maintain optimal operating conditions despite changes in orientation relative to the Earth's magnetic field, thereby resolving the contradiction between detector mobility and magnetic field interference.
Solution Approach 2:
The patent dynamically changes the bias current parameter through the coil to compensate for varying low-frequency magnetic field conditions. By adjusting this parameter in real-time based on the detector's orientation and environmental conditions, the system maintains stable high-frequency signal detection while operating in mobile environments with changing magnetic field exposure.
2Productivity
If the SQIF detects both low-frequency and high-frequency magnetic field components, then comprehensive signal detection is achieved, but the operating point becomes unstable and detection precision decreases
Solution Approach 1:
The patent extracts and separates the low-frequency magnetic field components from the total magnetic field using the bias circuit and coil combination. By removing these low-frequency components through nullifying feedback, the system allows the SQIF to focus on detecting high-frequency signals with improved precision, while still maintaining comprehensive detection capability through the overall system architecture.
3Device complexity
If no bias magnetic field is applied, then the circuit structure remains simple, but the SQIF cannot maintain a stable operating point for optimal detection
Solution Approach 1:
The patent introduces a dynamic bias circuit that automatically adjusts the bias magnetic field based on real-time operating conditions. This dynamic adjustment mechanism maintains a stable operating point for the SQIF without requiring overly complex circuitry, as the system adapts its biasing conditions rather than relying on fixed, complex compensation networks.
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 stable detection of high-frequency electromagnetic signals up to 100 GHz while the detector is in motion, by effectively attenuating low-frequency components of the Earth's magnetic field, thus ensuring accurate signal amplification and minimizing distortion.
Implementation Method 1
The coil generates the bias magnetic field through the SQIF from the bias current of the bias circuit
Implementation Method 2
A Superconducting Quantum Interference Array (SQIF) generates an output voltage that is a transfer function of the magnetic flux perpendicularly passing through the SQIF
Data Source
AI summary
A circuit includes a Superconducting Quantum Interference Array (SQIF), a bias circuit, and a coil. The SQIF generates an output voltage that is a transfer function of the magnetic flux perpendicularly passing through the SQIF. An external magnetic field and a bias magnetic field supply the magnetic flux. The bias circuit generates a bias current for biasing the SQIF at an operating point. The coil generates the bias magnetic field through the SQIF from the bias current of the bias circuit. The bias magnetic field provides nullifying feedback to the SQIF that counterbalances a low-frequency portion of the external magnetic field, such that the output voltage of the SQIF detects a high-frequency portion of the external magnetic field. The circuit can be a receiver with the output voltage of the SQIF detecting an electromagnetic signal while the receiver is moving with changing orientation relative to the Earth's magnetic field.