Magnetometric Sensor Feedback Circuit for Linear Wideband Detection
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Solution Overview
Problem
Current magnetometric sensors have limited frequency range and non-linear response to magnetic fields, restricting their bandwidth and sensitivity, especially at room temperature and low temperatures for superconducting sensors.
Innovation Solution
A magnetometric sensor design incorporating a superconducting magnetic sensor, a control circuit, and a conductive wire that generates a feedback current to compensate for external magnetic flux, allowing for a linear measurement of the magnetic field and expanding the sensor's bandwidth by optimizing the circuit's dimensions and configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the bandwidth of magnetometric sensors is widened by optimizing the impedance of the measurement circuit, then the frequency range is improved, but the measurement precision and linearity deteriorate
Solution Approach 1:
The patent implements a feedback circuit that generates a counter-reaction magnetic field to compensate for the external magnetic flux in real-time. This feedback mechanism maintains measurement linearity across a wide frequency range by actively correcting the sensor response, resolving the contradiction between bandwidth expansion and measurement precision preservation
Solution Approach 2:
The patent optimizes specific parameters including the impedance of the measurement circuit, the dimensions of the superconducting sensor, and the configuration of the feedback circuit. By carefully adjusting these parameters, the system achieves both wide bandwidth and high measurement linearity simultaneously
2Measurement precision
If superconducting materials are used to achieve highest sensitivity, then the measurement precision is improved, but the device complexity and operating conditions worsen
Solution Approach 1:
The patent replaces conventional magnetic sensing mechanisms with superconducting quantum interference devices (SQUIDs) and superconducting quantum interference filters (SQIFs). These superconducting components provide extremely high magnetic field sensitivity while integrating directly with the feedback circuit, achieving the desired precision without requiring complex mechanical or optical systems
Solution Approach 2:
The patent employs composite structures combining superconducting materials with conventional conductive materials in the feedback circuit. This composite approach leverages the high sensitivity of superconductors while using conventional materials for signal processing and control functions, managing the overall system complexity
3Measurement precision
If the linear response region is expanded for superconducting sensors, then the measurement precision is improved, but the bandwidth deteriorates
Solution Approach 1:
The feedback circuit continuously monitors the sensor output and generates a compensating signal to maintain operation within the linear response region. This active control enables the system to achieve both an expanded effective linear range and wide bandwidth by dynamically adjusting the operating point
Solution Approach 2:
The patent introduces dynamic control through the feedback circuit that adapts to changing magnetic field conditions. This dynamic adjustment allows the system to maintain linear response characteristics across a broader frequency spectrum, resolving the trade-off between linear range and bandwidth
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 design achieves a wide bandwidth from very low to ultra-high frequencies with a linear response to magnetic fields, enhancing sensitivity and allowing for high-density integration and detection of magnetic fields across a broad range.
Implementation Method 1
a magnetic sensor (12) having a surface and generating a response signal when it is immersed in an external magnetic field creating an external flux through said surface
Implementation Method 2
the wire being traversed by the feedback current, the circuit and the conducting wire being such that a feedback magnetic field is created whose counter-reaction flux through the surface of the magnetic sensor substantially compensates, at each instant, the external flux
Implementation Method 3
such a magnetic sensor, using superconducting materials, operates at low temperatures, around approximately 80 K, for so-called high critical temperature superconducting materials
Data Source
Figure 1~3
AI summary
The invention relates to a sensor (10) which includes a magnetic sensor (12) generating a response signal (V) when plunged into an external magnetic field (Bext) creating an external flux (φext) through said sensor. Said sensor includes: a control circuit (14) taking the response signal from the sensor as input and generating a feedback current (iCR) as output; and a conductive wire (16) arranged in the vicinity of the sensor and connected to the output of the control circuit, the wire having the feedback current passing therethrough, the circuit and the conductive wire being such that a magnetic feedback field (BCR) is created in which the flux through the sensor substantially compensates for the external flux at each instant, an output signal of the sensor being made up of the feedback current.