Optical Fiber Nodes for Distributed Aircraft Cabin Air Quality Sensing
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Solution Overview
Problem
Existing air quality monitoring systems in closed spaces are often complex, bulky, expensive, and limited in their ability to accurately and reliably monitor a range of environmental conditions due to constraints on sensor placement and performance.
Innovation Solution
A distributed environmental condition or air quality sensing system using optical fibers, where nodes along the fiber are configured to detect specific environmental conditions such as temperature, humidity, gas composition, and particulate matter, using coatings that react to chemicals and light scattering for pressure and temperature detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple different types of sensors are used to detect different air properties, then the range of environmental conditions that can be monitored is improved, but the device complexity and bulkiness increase
Solution Approach 1:
The optical fiber node is designed as a universal sensing platform that can detect multiple environmental parameters (temperature, pressure, humidity, gas composition, particulate matter) simultaneously through a single integrated device. Different sensing mechanisms are incorporated within the same node structure, allowing one fiber node to replace multiple separate sensors while maintaining the ability to monitor diverse air properties
Solution Approach 2:
Multiple sensing functions are merged into a single optical fiber node structure. The node integrates temperature sensing, pressure sensing, gas detection, and particulate matter detection capabilities within one compact unit, eliminating the need for separate sensor assemblies and reducing overall system complexity
2Measurement precision
If sensors are placed at optimum locations for accurate monitoring, then the measurement precision is improved, but the device complexity and installation difficulty increase
Solution Approach 1:
The optical fiber is divided into multiple segments or nodes along its length, with each node capable of independent environmental monitoring. This segmentation allows sensors to be distributed at multiple locations simultaneously, improving spatial coverage and measurement precision without requiring complex centralized sensor placement
Solution Approach 2:
The sensing system transitions from point-based sensor placement to distributed linear monitoring along the optical fiber. By utilizing the spatial dimension of the fiber itself as the mounting structure, multiple sensing points are achieved naturally along the fiber length, eliminating complex mounting constraints
3Measurement precision
If a distributed sensing system is used to provide multiple sensing points, then the measurement precision and response time are improved, but the device complexity increases
Solution Approach 1:
The system replaces complex mechanical sensor assemblies with an optical-based distributed sensing platform. Light propagation through the optical fiber serves as the sensing mechanism, eliminating the need for complex mechanical mounting structures, wiring, and power distribution required by traditional distributed sensor networks
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 a simple, lightweight, and integral method for monitoring air quality in closed spaces, enabling effective data collection for controlling environmental control systems and offering improved accuracy and response time with multiple sensing points.
Implementation Method 1
different nodes may provide indications of different pressure, temperature, relative humidity or other conditions of the environment at different locations due to different light scattering
Implementation Method 2
Different nodes may be provided with MOF coatings that respond to specific chemicals thus differentially changing the properties of the returned light
Data Source
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AI summary
This disclosure relates to the use of fibre optics for distributed environmental condition and/or air quality sensing such as, but not limited to, sensing air quality in enclosed areas of an aircraft such as the passenger cabin. Fibre optics can be used for sensing and for communication and are therefore well suited to the distributed sensing of environmental conditions such as temperature, relative humidity, gas and particulate composition within spaces of the aircraft e.g. the cabin, cargo space, cockpit, electronics bay etc. and in related systems such as the environmental control system (ECS), the cabin recirculation system, bleed air system etc.