Capacitor-Inductor Sensor Array for Damage Detection in Thermal Fabrics
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Solution Overview
Problem
Current methods for detecting damage in multi-layer fabrics, such as those used in protective clothing and structures, are inadequate as they require electrical sensors with high failure probabilities and cannot reliably identify small damages, which can be critical in harsh environments.
Innovation Solution
A damage detection and localization system incorporating an array of sensors defined by capacitance and inductance, where each sensor is a reflective-surface conductor, exchanging energy between magnetic and electric fields, and using a magnetic field response recorder to establish baseline and detect changes in frequency response indicative of damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical sensors are used for damage detection, then damage can be detected, but the failure probability increases proportionally to the number of sensors used
Solution Approach 1:
The patent replaces electrical sensors with magnetic sensors that detect changes in magnetic field properties (impedance, inductance, capacitance) caused by damage. This substitution eliminates the need for complex electrical circuit connections while maintaining damage detection capability, thereby improving reliability and reducing device complexity
Solution Approach 2:
The magnetic sensor array serves multiple functions: it detects damage, locates damage precisely, and can be integrated into the fabric structure itself. The sensors are made from conductive materials that provide both sensing capability and thermal protection, reducing the need for separate components
2Temperature
If multi-layer fabrics are used for thermal protection, then thermal protection is provided, but small damages are difficult to detect
Solution Approach 1:
The fabric is divided into multiple sensor elements that are distributed throughout the multi-layer structure. Each sensor monitors its local area independently, enabling precise detection of small damages while the collective array provides comprehensive coverage. The segmented sensor array can identify the exact location and size of damages that would be invisible in continuous fabric
Solution Approach 2:
The sensor array is integrated within the multi-layer fabric structure, with sensors nested between protective layers. The conductive sensor materials are embedded in the fabric layers, allowing the sensing function to be contained within the thermal protection structure itself, achieving both functions simultaneously
3Reliability
If electrical sensors are used for damage detection, then damage can be detected, but electrical connections become cumbersome
Solution Approach 1:
The patent replaces electrical connection systems with magnetic field-based sensing. The magnetic sensors detect damage through changes in magnetic field properties without requiring physical electrical connections to external systems. This eliminates the complexity of wiring, connectors, and power distribution while maintaining reliable damage detection
Solution Approach 2:
The sensor array is passively interrogated by an external magnetic field source. The sensors themselves generate no electrical signals or require no active power supply - they merely respond to the interrogating field with changes in their magnetic properties when damaged. This self-service capability eliminates the need for complex electrical connection systems
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
Enables reliable detection and localization of small damages in multi-layer fabrics, providing thermal protection and reducing the need for cumbersome electrical connections, while enhancing thermal protection by tiling the area of interest with capacitor-inductor pairs.
Implementation Method 1
Each sensor is defined by capacitance operatively coupled to inductance such that energy can be exchanged between the magnetic field stored via inductance and the electric field stored via capacitance
Implementation Method 2
Each sensor is defined by capacitance operatively coupled to inductance
Implementation Method 3
Each sensor is defined by capacitance operatively coupled to inductance
Implementation Method 4
A magnetic field response recorder is used to interrogate each sensor prior to damage thereof to establish a baseline frequency response therefore
Data Source
AI summary
A damage locating system also provides thermal protection. An array of sensors substantially tiles an area of interest. Each sensor is a reflective-surface conductor having operatively coupled inductance and capacitance. A magnetic field response recorder is provided to interrogate each sensor before and after a damage condition. Changes in response are indicative of damage and a corresponding location thereof.