Flexible RTD Sensor Platelets for Aircraft Overheating Localization
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Solution Overview
Problem
Existing overheating detection systems in aircraft, particularly those using eutectic temperature sensors, face challenges such as rigidity constraints, difficulty in localizing overheating sources, and vulnerability to environmental conditions like vibrations, limiting their effectiveness in detecting and pinpointing overheating issues.
Innovation Solution
An electronic device with flexible RTD-based sensors that utilize a support structure and platelet pairs to detect air flows, allowing for precise localization of overheating by measuring electrical resistance variations, and incorporating a detection module for real-time air flow speed estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If eutectic temperature sensors with conducting core and envelope are used, then overheating detection capability is improved, but the detector cable rigidity increases making installation difficult
Solution Approach 1:
The patent replaces the rigid conducting envelope with a flexible printed circuit board (FPC) that has conducting traces. The FPC maintains electrical conductivity while providing flexibility for easy installation and routing in aircraft environments, directly resolving the contradiction between detection reliability and installation ease.
2Reliability
If eutectic sensors are used, then overheating detection is achieved, but precise localization of overheating source is not possible
Solution Approach 1:
The patent divides the detection system into multiple discrete sensors, each with its own unique identification code. By segmenting the detection function across multiple coded sensors rather than using a single continuous cable system, the system can precisely locate overheating sources by identifying which specific sensor detects the temperature anomaly.
3Temperature
If rigid detector cables with central core and envelope are used, then high temperature withstand capability is improved, but the radius of curvature constraint increases
Solution Approach 1:
The rigid metallic envelope is replaced with a flexible printed circuit board that can bend to tight radii while maintaining structural integrity and electrical conductivity. The FPC construction allows the sensor to conform to complex aircraft geometries without the minimum radius of curvature constraints imposed by rigid cable designs.
4Reliability
If eutectic sensors are used, then temperature detection is achieved, but vulnerability to vibrations increases
Solution Approach 1:
The flexible FPC construction with adhered eutectic material creates a more vibration-resistant sensor assembly compared to rigid cable designs. The flexible substrate better absorbs and dissipates vibration energy, reducing the harmful effects of aircraft vibrations on sensor reliability while maintaining temperature detection capability.
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 immediate detection of high-speed air flows and precise localization of overheating sources, improving the accuracy and reliability of overheating detection in aircraft systems.
Implementation Method 1
each sensor comprises at least one pair of platelets, each platelet comprising an RTD (resistance temperature detector)
Implementation Method 2
an air flow with a speed higher than a predetermined speed being able to make the sensor go from a first state, corresponding to the switch being closed, in which the free ends of the platelets overlapping one another are in contact, to a second state, corresponding to the switch being open, in which said contact is broken
Data Source
AI summary
An electronic device for detecting an air flow includes at least one sensor having a pair of platelets, each platelet having an RTD and having one end fixed, the other end being free and overlapping the free end of the other platelet. A platelet is flexible so as to form a switch for an electrical circuit. An air flow with a speed higher than a predetermined speed makes the sensor go from a first state, corresponding to a closed switch, in which the free ends of the platelets are in contact, to a second state, corresponding to an open switch, in which said contact is broken. A detection module allows, for each sensor, a resistance of the electrical circuit to be measured, the resistance corresponding to the RTDs being connected in parallel when the switch is closed or to one of the RTDs when the switch is open.