Few-mode Fiber Current Sensor via Mode-Specific Doping
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Solution Overview
Problem
Current sensors face challenges in accurately measuring electrical current without encircling the conductor and achieving high reliability and cost-effectiveness.
Innovation Solution
A few-moded fiber doped to exhibit different magnetic-field-dependent effects on spatial modes, allowing for current measurement through magnetic-field-induced birefringence, with a simplified design that separates bend-induced and magnetic-field-induced birefringence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional current sensors encircle the conductor, then measurement reliability is improved, but device complexity and installation difficulty increase
Solution Approach 1:
The fiber optic sensor is divided into multiple mode sections with different doping characteristics. Each section supports different spatial modes that interact differently with the magnetic field, enabling current measurement without requiring the sensor to encircle the conductor. This segmentation approach maintains measurement reliability while simplifying the overall device structure.
Solution Approach 2:
Different sections of the fiber optic sensor are doped with different concentrations or types of dopants to create local variations in magnetic-field-dependent effects. This allows each local region to exhibit specific properties that contribute to the overall current measurement function, eliminating the need for complex encircling structures.
2Measurement precision
If fiber optic sensor uses magnetic-field-dependent effects on spatial modes, then current measurement accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The invention varies doping parameters (concentration, type, distribution) along the fiber length to create the desired magnetic-field-dependent effects on different spatial modes. By controlling these parameters during the fiber drawing process, the patent achieves high measurement accuracy while maintaining compatibility with existing manufacturing techniques.
Solution Approach 2:
The fiber optic sensor utilizes composite doping structures combining different dopant materials in specific configurations. This allows the fiber to exhibit multiple magnetic-field-dependent effects simultaneously, improving current measurement accuracy while leveraging established composite material fabrication methods.
3Reliability
If sensor separates bend-induced and magnetic-field-induced birefringence, then measurement reliability is improved, but device complexity increases
Solution Approach 1:
The patent extracts and compensates for bend-induced birefringence effects by using reference measurements or compensation algorithms. This separates the magnetic-field-induced signal from mechanical disturbance artifacts, improving measurement reliability while using computationally efficient methods rather than complex hardware solutions.
Solution Approach 2:
The sensor system incorporates feedback mechanisms that monitor and compensate for bend-induced birefringence in real-time. By continuously measuring and correcting for mechanical disturbances, the system maintains high measurement reliability without requiring overly complex device architecture.
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 enables high-accuracy current measurement with reduced complexity and system-level costs, applicable in various contexts, including industrial and medical applications.
Implementation Method 1
a few-moded fiber which is doped such that spatial modes of a signal exhibit different magnetic-field-dependent effects
Implementation Method 2
the magnetic-field-dependent effects on the different spatial modes can be determined
Data Source
AI summary
A few-moded fiber is doped such that spatial modes of a signal exhibit different magnetic-field-dependent effects. Based on these magnetic-field-dependent effects, one can determine the electric current that induced a magnetic field that caused these effects.