Capacitive Ice Detection and Joule Heating Aircraft Skin
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Solution Overview
Problem
Current methods for detecting and eliminating ice on aircraft structures are cumbersome, require significant resources, and lack real-time capabilities, especially when the aircraft is in flight, and do not effectively address the issue of infiltrated liquids that can compromise mechanical resistance.
Innovation Solution
A device comprising a network of capacitive sensors integrated into a flexible substrate, capable of detecting ice or liquid presence through capacitive variations and using low-power conductive elements to defrost or evaporate the substances, with a microprocessor for automatic operation and minimal weight and space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical-chemical means (defrosting liquids, coatings) are used to remove ice, then ice removal effectiveness is improved, but device complexity and operational complexity increase, requiring special facilities and qualified operators
Solution Approach 1:
The system automatically detects ice presence through capacitive sensors and activates heating elements without requiring qualified operators or special facilities. The microprocessor controls the entire process autonomously, transforming the system from manual/chemical operations to self-service automated operation.
Solution Approach 2:
The patent replaces physical-chemical means (defrosting liquids, coatings) with an electrical/thermal system. Capacitive sensors detect ice, and electric heating elements remove it, substituting chemical processes with electrical/thermal processes that require no special facilities or qualified operators.
2Reliability
If thermal defrosters with warm air conduits are used, then ice removal capability is improved, but weight and space requirements increase due to major air supply systems
Solution Approach 1:
The system extracts the ice removal function from the major air supply system and implements it through lightweight electric heating elements embedded in the structure. This separates the detection and heating functions from the pneumatic system, dramatically reducing weight and space requirements.
Solution Approach 2:
The patent replaces the mechanical pneumatic system (conduits for warm air) with an electrical system (heating elements powered by electricity). This substitution eliminates the need for major air supply infrastructure, reducing both weight and space occupation.
3Reliability
If pneumatic defrosting devices with flexible tubes are used, then ice breaking capability is improved, but device complexity and space requirements increase due to hoses and controls
Solution Approach 1:
The system extracts the ice breaking function from the pneumatic tube system and implements it through electric heating elements. This eliminates hoses, valves, and control mechanisms, reducing device complexity and space requirements while maintaining effective ice removal.
Solution Approach 2:
The patent replaces the mechanical pneumatic system (flexible tubes, valves, controls) with an electrical system (heating elements with simple electrical controls). This substitution dramatically simplifies the device structure and reduces the space needed for hoses and associated controls.
4Measurement precision
If ground ice detection systems are used, then ice detection capability is improved, but ease of operation deteriorates as they are difficult to use and unsuited for aircraft structures
Solution Approach 1:
The capacitive sensor system is designed to be universally applicable to various aircraft structures (wings, fuselage, tail) and can be integrated into existing systems. The sensors automatically detect ice presence without requiring manual operation or specialized handling, making them easy to deploy and operate.
Solution Approach 2:
The detection system operates autonomously, with capacitive sensors automatically sensing ice presence and triggering the heating elements without requiring manual intervention. This self-service operation eliminates the difficulty of manual detection systems while maintaining high measurement precision.
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 real-time detection and elimination of ice and liquids on aircraft surfaces and within structures, reducing operator workload, maintenance costs, and fuel consumption, while ensuring safe and efficient flight operations.
Implementation Method 1
A device for detecting and eliminating the presence of a layer of ice formed on the outside of an aircraft structure... has at least one pair of subnetworks of conductive elements... which form a network of capacitive sensors
Implementation Method 2
The presence of ice or liquid is detected by a network of capacitive sensors... The conductive elements are incorporated into an insulating material... When the conductive elements of the first subnetwork and the two conductive elements of the second subnetwork are fitted together, they form a network of capacitive sensors
Implementation Method 3
The conductive elements are incorporated into an insulating material... To eliminate the layer of ice, said covering is preferably attached to part of said outside of the structure... The sending of a current in an assembly of networks of capacitive sensors can be sequential so as to create sequential heating
Data Source
AI summary
A device for detecting and eliminating a layer of ice formed on the surface of an aircraft structure or a liquid that has infiltrated inside of a structure and/or into the material of the structure. The device includes at least one pair of subnetworks of conductive elements, each subnetwork including at least one series of conductive elements, the aforementioned subnetworks being arranged in such a way that the interfitting between the conductive elements of the first subnetwork and the conductive elements of the second subnetwork forms a network of capacitive sensors, said the aforementioned conductive elements being embedded in an insulating material, each subnetwork of conductive elements being incorporated into a flexible substrate so that the entire assembly forms a flexible covering.