Optical Waveguide Hotspot Detection in Superconductors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current hotspot detection techniques for superconductors, particularly in high-voltage direct current (HVDC) grids and Superconducting Fault Current Limiters (SFCLs), are inefficient and costly, often leading to unnecessary shutdowns and inability to quickly detect singular hotspots, which can cause material degradation and damage.
Innovation Solution
A Mach-Zehnder Interferometer-based optical waveguide/fiber sensing system that rapidly detects hotspots by producing an optical interference signal with a signature phase shift, allowing for quick identification of hotspots within 10 ms, enabling rapid alarm raising and preventing thermal runaways.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical waveguide/fiber sensing is used for hotspot detection, then detection speed and precision are improved, but device complexity increases
Solution Approach 1:
The patent combines the optical waveguide sensing function directly with the superconductor structure, integrating the monitoring capability into the existing device rather than adding separate external sensing systems. This merging approach improves detection precision while minimizing the increase in overall device complexity.
Solution Approach 2:
The optical waveguide acts as an intermediary element that converts thermal changes in the superconductor into optical signal variations. This mediator enables precise hotspot detection through optical interference patterns without requiring direct thermal contact or complex electrical sensing arrangements.
2Reliability
If rapid hotspot detection is implemented, then thermal runaway prevention is improved, but response time requirements increase system demands
Solution Approach 1:
The optical waveguide is pre-positioned along the superconductor length before operation, establishing the sensing network in advance. This preliminary arrangement enables immediate detection response when hotspots occur, as the sensing infrastructure is already in place and does not require activation or setup during critical events.
Solution Approach 2:
The patent replaces traditional electrical or thermal sensing methods with optical sensing. The optical interference-based detection system responds to thermal changes through optical path length variations, providing faster response times and eliminating the delays associated with electrical signal processing or thermal conduction-based detection.
3Measurement precision
If optical interference signaling is used for hotspot detection, then detection sensitivity is improved, but system cost increases
Solution Approach 1:
The patent uses optical copying of the thermal field distribution along the superconductor through the waveguide. The optical interference pattern creates a spatial map of temperature variations, enabling sensitive detection of hotspots without requiring expensive point-by-point thermal sensors or complex imaging systems.
Solution Approach 2:
The system detects hotspots by monitoring changes in optical parameters (phase, intensity) of the waveguide rather than directly measuring temperature. This parameter transformation converts thermal information into optical signals that can be detected with high sensitivity using standard optical components, reducing overall system cost.
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 solution provides a cost-effective and efficient method for monitoring superconductor health, enabling swift decision-making and preventing damage by detecting even singular hotspots, thus enhancing the reliability and safety of HVDC grids and SFCLs.
Implementation Method 1
The phase shift is dependent upon the length and temperature of the hotspot or hotspots in the superconductor
Implementation Method 2
The phase shift is dependent upon the length and temperature of the hotspot or hotspots in the superconductor
Implementation Method 3
interference means configured to overlay or superimpose the first optical signal and the reference optical signal to produce an optical interference signal
Data Source
Figure 1~2
Figure 3~4
Figure 5~6B
AI summary
Hotspot monitoring system for superconducting devices including: - a superconductor; - a first optical waveguide attached to the superconductor for providing a first optical signal; - a second optical waveguide for providing a reference signal; and - interference means configured to overlay or superimpose the first optical signal and the reference optical signal to produce an optical interference signal.