Magnetic Sensor Integrated Calibration Trace System
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Solution Overview
Problem
Existing magnetic sensor calibration methods are inefficient as they require sensors to be offline or physically moved, leading to increased costs and complexity, especially when higher accuracy is needed, and they do not allow for continuous calibration while in use.
Innovation Solution
A system with a magnetic sensor, a calibration trace, a controlled current source, and a comparator that enables in-system calibration by generating a calibration magnetic field and comparing it to the sensor's output, allowing for continuous adjustment and compensation of environmental changes such as temperature and aging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional calibration methods are used, then calibration can be performed, but the sensor must be offline or physically moved, reducing productivity and increasing complexity
Solution Approach 1:
The patent implements continuous calibration by keeping the calibration trace and sensor in constant proximity during normal operation. The calibration trace remains activated alongside the sensor, enabling uninterrupted calibration signals to be continuously generated and processed, eliminating the need to take the sensor offline for calibration.
Solution Approach 2:
The calibration trace acts as an intermediary element that generates calibration magnetic fields independently of the sensor. This intermediary allows the calibration process to occur simultaneously with normal sensing operations, as the trace provides reference calibration signals while the sensor performs its primary function without interruption.
2Measurement precision
If stronger magnets are used to overcome field interference, then magnetic field detection improves, but cost and variability from aging and temperature increase
Solution Approach 1:
Instead of using stronger magnets to overcome interference, the patent creates a simplified copy of the calibration process using a calibration trace. This trace reproduces the necessary calibration magnetic fields at a reduced scale, providing accurate calibration references without requiring powerful magnets, thereby reducing system complexity and variability.
Solution Approach 2:
The calibration trace serves as a simple, inexpensive calibration reference that can be easily implemented within the sensor system. Rather than relying on complex, expensive magnet assemblies, the trace provides sufficient calibration functionality through its straightforward design, reducing overall system cost and complexity.
3Measurement precision
If calibration is performed periodically, then accuracy can be maintained, but time is lost during calibration operations
Solution Approach 1:
The calibration trace operates continuously alongside the sensor during normal operation, eliminating the need for periodic calibration interruptions. The continuous generation of calibration signals allows the sensor to maintain accuracy without stopping, as calibration occurs in parallel with sensing operations rather than requiring dedicated calibration time windows.
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
This approach allows for accurate, continuous calibration of magnetic sensors while they are in use, reducing costs and maintaining system integrity without the need for additional magnets or physical relocation, ensuring consistent performance over time.
Implementation Method 1
a controlled current source coupled to the calibration trace and configured to output a current resulting in a magnetic field output from the calibration trace
Implementation Method 2
a magnetic sensor configured to output a signal corresponding to magnetic fields
Data Source
AI summary
Methods and apparatus for magnetic sensors and integrated calibration. In an example arrangement, a system includes a magnetic sensor configured to output a signal corresponding to magnetic fields; a calibration trace disposed proximal to the magnetic sensor; a controlled current source coupled to the calibration trace and configured to output a current resulting in a magnetic field output from the calibration trace; and a comparator coupled to the output signal from the magnetic sensor and to an expected signal. In the example arrangement, the comparator outputs a signal indicating whether the output signal from the magnetic sensor corresponds to the expected signal. Methods are also disclosed.