Gas Sensor RF Resonator High Temperature Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing gas sensors for aerospace environments, such as those on aircraft, face challenges due to internal or local electronics that degrade at elevated temperatures, making them unreliable for detecting gases like combustible hydrocarbons, carbon dioxide, and volatile organic compounds.
Innovation Solution
A gas sensor design featuring a housing with a cavity and vent hole, incorporating a distributed element resonator that operates without internal electronics, using high-temperature compatible materials like sapphire or silicon carbide for the mechanical components and platinum or titanium for the electrical layers, allowing it to function effectively in high-temperature environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If semiconductor-based electronics are used for power and signal conditioning in gas sensors, then the sensors can perform detection functions, but the electronics degrade or fail at elevated temperatures
Solution Approach 1:
The patent removes all internal and local electronics from the gas sensor device, extracting the problematic semiconductor components that degrade at high temperatures. The sensor uses a resonant structure with no electronic components inside the housing, eliminating the reliability issue while maintaining detection capability through purely physical resonance measurements.
Solution Approach 2:
The patent replaces electronic-based detection systems with a mechanical resonance-based system. The resonant structure's natural frequency changes in response to gas presence, providing detection capability without requiring semiconductor electronics, thus enabling operation at elevated temperatures where traditional electronic sensors fail.
2Ease of operation
If electronics are integrated into the gas sensor for signal processing, then the sensor functionality is complete, but the device complexity increases and reliability decreases at high temperatures
Solution Approach 1:
The patent extracts all electronic signal processing components from the sensor device itself, placing them in external equipment. This eliminates internal electronics that would add complexity and reduce reliability, while the resonant structure provides the core sensing function with minimal components - essentially a resonant element and a coupling mechanism.
Solution Approach 2:
The resonant structure serves multiple functions simultaneously: it acts as the sensing element, the signal generator, and the detection mechanism. This multi-functionality eliminates the need for separate electronic components for each function, reducing device complexity while maintaining complete sensor functionality.
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 gas sensor effectively detects gases by measuring changes in resonant frequency due to permittivity changes, providing improved selectivity and reliability at elevated temperatures without the degradation issues associated with traditional semiconductor-based electronics.
Implementation Method 1
a distributed element resonator within the cavity, wherein the distributed element resonator has an input terminal configured to receive an radio frequency input signal and an output terminal configured to produce an output signal
Implementation Method 2
measuring changes in resonant frequency due to permittivity changes
Data Source
AI summary
A gas sensor for detecting a gas in an environment is disclosed. The gas sensor comprises a housing having a cavity and a vent hole within the housing and a distributed element resonator within the cavity. The cavity includes a bottom surface and a top surface, and the housing is configured to receive the gas from the environment into the cavity through the vent hole. The distributed element resonator has an input terminal configured to receive a radio frequency input signal and an output terminal configured to produce an output signal.