Dielectric Waveguide RF Isolation for Hydrogen Sensor Power and Signals
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Solution Overview
Problem
Hydrogen leakage in the aviation industry poses a significant safety concern due to its low minimum ignition energy and high flammability, and existing hydrogen sensors require direct electrical connections for power and signal transmission, which can be hazardous in potentially explosive environments.
Innovation Solution
A system that galvanically isolates hydrogen sensors from a sensor controller using a Radio Frequency (RF) signal transponder, power converter, and sensor interrogator, allowing for RF electromagnetic wave transmission through a dielectric waveguide to provide power and control signals, thereby eliminating the need for direct electrical connections and reducing the risk of ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct electrical connections are used to provide power and control signals to hydrogen sensors, then reliable power supply and signal transmission are achieved, but the risk of spark-induced ignition in hydrogen-rich environments increases
Solution Approach 1:
The patent introduces an RF electromagnetic wave as an intermediary medium to transmit power and control signals between the controller and sensors. The RF signal acts as a mediator that carries energy and information through the air or dielectric waveguide without requiring direct electrical contact, thereby eliminating spark risks while maintaining communication reliability
Solution Approach 2:
The patent replaces the traditional mechanical/electrical connection system with an electromagnetic field-based system. Instead of using physical wires that can create sparks at connection points, the system uses RF electromagnetic waves to transfer energy and signals, substituting a potentially hazardous mechanical-electrical interface with a non-contact electromagnetic field interface
2Object-affected harmful factors
If RF electromagnetic waves are used to transmit power and signals to sensors, then galvanic isolation and ignition risk are eliminated, but system complexity increases due to additional components
Solution Approach 1:
The RF transponder module performs multiple functions simultaneously: it receives RF electromagnetic waves for power harvesting, modulates the RF signal for bidirectional communication, and drives the hydrogen sensor. This multi-functionality consolidates what would otherwise require separate power supply, communication, and sensor control circuits into a single integrated module, reducing overall system complexity despite the novel approach
3Object-affected harmful factors
If galvanic isolation is implemented using RF transponders, then safety in hydrogen environments is improved, but power transmission efficiency decreases due to conversion losses
Solution Approach 1:
The patent combines the power reception, signal modulation, and sensor drive functions into a single RF transponder module. By merging these functions, the system minimizes the number of power conversion stages and reduces cumulative conversion losses. The integrated design allows the RF energy to be directly harvested and utilized for both communication and sensor operation, improving overall power efficiency compared to separate power and communication circuits
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 effectively isolates sensors from potential ignition sources, enhancing safety by preventing spark-induced fires or explosions while maintaining reliable hydrogen leakage detection and monitoring capabilities.
Implementation Method 1
RF electromagnetic waves, via a dielectric waveguide, from the sensor controller
Implementation Method 2
convert the received RF electromagnetic waves to an RF electrical signal
Implementation Method 3
The power rectifier is configured to rectify the RF power signal component, thereby generating a rectified power signal
Implementation Method 4
RF electromagnetic waves, via a dielectric waveguide
Data Source
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Figure 3A
AI summary
Apparatus and associated methods relate to galvanically isolating one or more sensors from a controller. Power and control signals are provided to an isolation system via RF electromagnetic waves transmitted from the controller to the isolation system via a dielectric waveguide. The received RF electromagnetic waves are converted into an RF electrical signal and then the RF electrical signal is separated into power and control signal components. The RF power signal component is rectified and regulated so as to provide power to the isolation system. A sensor interrogator is electrically connected to one or more sensors so as to receive sense signals therefrom. The sensor interrogator generates a data signal indicative of one or more physical metrics of a potentially hazardous environment in which the one or more sensors are situated. The data signal is converted to RF electromagnetic waves, which are transmitted, via the dielectric waveguide, to the controller.