Capacitive Sensor Array for Structural Damage Detection
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Solution Overview
Problem
Existing sensor systems for structural health assessment and damage detection are bulky, energy-inefficient, and difficult to integrate into complex or large structures, making real-time damage sensing challenging.
Innovation Solution
A capacitive sensor array with varying capacitances, comprising an array of capacitive elements, a measurement lead, and a ground plane lead, where changes in total capacitance indicate damage to specific elements, allowing for real-time structural health assessment and damage detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing sensor systems are used for structural health assessment, then damage detection capability is provided, but the systems are bulky and add excessive weight to the structure
Solution Approach 1:
The patent replaces traditional mechanical sensor systems with a capacitive sensing system that uses electrical fields to detect structural damage. The capacitive elements measure changes in capacitance caused by damage to the structure, eliminating the need for bulky mechanical sensors while maintaining damage detection capability.
Solution Approach 2:
The patent employs thin-film capacitive elements that can be applied as flexible coatings or integrated into the structure. These thin-film sensors provide damage detection functionality without adding significant weight, as they conform to the structure's surface with minimal material thickness.
2Reliability
If existing sensor systems are used for structural health assessment, then damage detection is enabled, but the systems are overly bulky and difficult to integrate into complex structures
Solution Approach 1:
The patent divides the sensing system into multiple discrete capacitive elements arranged in an array across the structure. Each element independently monitors a specific location, and the collective array provides comprehensive coverage. This segmentation allows the system to adapt to complex geometries and simplifies integration compared to a single bulky sensor system.
Solution Approach 2:
The capacitive elements serve multiple functions: they detect damage, assess structural health, and can be applied to various types of structures (aircraft, bridges, buildings). The same basic capacitive technology adapts to different structural configurations, reducing integration complexity across diverse applications.
3Reliability
If existing sensor systems are used for real-time damage sensing, then structural health assessment is provided, but the systems are not energy efficient
Solution Approach 1:
The capacitive sensing system uses periodic excitation signals to measure capacitance changes. By employing pulsed or periodic measurement cycles rather than continuous monitoring, the system achieves real-time damage detection capability while significantly reducing average power consumption compared to continuously active traditional sensor systems.
4Reliability
If existing sensor systems are used for damage detection, then structural health assessment is enabled, but real-time sensing over large areas is challenging
Solution Approach 1:
The patent uses an array of multiple capacitive elements distributed across the structure's surface. This segmented arrangement allows the system to cover large areas by dividing the total coverage into discrete sensing zones, each monitored by individual capacitive elements that collectively provide comprehensive real-time monitoring of the entire structure.
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 system provides scalable, energy-efficient, and flexible damage detection over large areas, pinpointing damaged locations within complex structures without requiring structural displacement, capable of detecting deformation, degradation, moisture intrusion, corrosion, and delamination.
Implementation Method 1
the capacitive elements of the array of capacitive elements are arranged positionally within the array of capacitive elements such that a change in total capacitance between the measurement lead and the ground plane lead is indicative of damage to a particular capacitive element
Data Source
AI summary
An example system includes an array of capacitive elements, a measurement lead, and a ground plane lead. One or more respective capacitive elements of the array of capacitive elements include a dielectric substrate and a corresponding top conductive layer, with each dielectric substrate configured to be positioned between the top conductive layer and a common ground plane. The measurement lead is coupled to the top conductive layer of each of the one or more respective capacitive elements. The ground plane lead is configured to be coupled to the common ground plane. The capacitive elements are structured such that the capacitive elements have varying respective capacitances, and the capacitive elements are arranged positionally within the array of capacitive elements such that a change in total capacitance is indicative of damage to a particular capacitive element at a particular position within the array of capacitive elements.