Clapp Oscillator Pressure Sensing for High-Temperature Engines
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Solution Overview
Problem
Conventional sensor systems are ill-suited for harsh operating environments, such as high-temperature and vibration conditions in gas turbine engines and vehicle engines, due to temperature limitations of silicon-based electronics, leading to inaccurate diagnostics and reduced operational efficiency.
Innovation Solution
A pressure sensor system utilizing a Clapp-type oscillator with a SiCN microelectromechanical systems (MEMS)-based SiC capacitive pressure sensor, a 6H-SiC metal-semiconductor field-effect transistor (MESFET), SiC-based metal-insulator-metal (MIM) capacitors, and spiral inductors, capable of operating at temperatures up to 400°C and pressures of 0 to 350 PSIG, with a compact form factor and improved frequency stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If silicon-based electronics are used in harsh operating environments, then the system can achieve miniaturization and integration, but the temperature stability and operational lifetime are limited due to temperature constraints
Solution Approach 1:
The patent changes the material parameter from conventional silicon-based electronics to wide-bandgap semiconductor materials (GaN, SiC) that inherently withstand higher temperatures. This material substitution enables the system to operate at temperatures exceeding 200°C while maintaining electronic functionality, thus resolving the contradiction between miniaturization and temperature stability.
Solution Approach 2:
The patent employs composite material structures combining wide-bandgap semiconductor materials with high-temperature stable passive components and specialized packaging materials. This composite approach creates an integrated sensor system that maintains performance across extreme temperature ranges while achieving compact form factor through co-integration of sensing and electronics.
2Temperature
If temperature-sensitive electronic components are located to cooler sections of the system, then temperature stability is improved, but the system size increases and wiring complexity increases
Solution Approach 1:
The patent merges the sensor element and signal conditioning electronics into a single integrated unit using wide-bandgap semiconductor technology. Both the sensing function and electronic processing are co-integrated on the same high-temperature stable substrate, eliminating the need to separate components to different temperature zones and thus avoiding increased system size and wiring complexity.
Solution Approach 2:
The wide-bandgap semiconductor platform provides multi-functionality by serving as both the sensing element substrate and the electronic circuit substrate. This universal material platform allows temperature-sensitive electronics to operate directly at the sensor location in harsh environments, combining multiple functions in a single integrated structure without requiring separate cooling zones.
3Reliability
If conventional sensor systems are deployed in harsh environments, then the system can provide monitoring capability, but measurement precision and reliability degrade due to temperature and vibration effects
Solution Approach 1:
The patent changes the operational parameter range by using wide-bandgap semiconductor materials that maintain electrical characteristics stability at high temperatures and under vibration. These materials exhibit reduced temperature coefficients and enhanced mechanical robustness, enabling precise measurements in environments previously unsuitable for conventional sensors.
Solution Approach 2:
The patent employs disposable or replaceable sensor modules with integrated electronics that can withstand harsh conditions for their designed service life. These modules are engineered to maintain precision throughout their operational lifetime in harsh environments, after which they can be replaced rather than requiring complex environmental control systems.
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 enables accurate in-situ health monitoring in harsh environments, providing reliable dynamic data acquisition and extending the operational lifetime of engines by maintaining performance across extreme temperatures and pressures.
Implementation Method 1
The inductor, the pressure sensing capacitor, the first capacitor, the second capacitor, and the FET form a Clapp-type oscillator
Implementation Method 2
an inductor and a pressure sensing capacitor connected to the inductor in series
Data Source
AI summary
Pressure sensors are disclosed that may perform health monitoring in-situ in harsh operating environments. The pressure sensors may be based on a Clapp-type oscillator that includes one or more resistors, one or more inductors, capacitors, a sensor, and a transistor. Such pressure sensors may be particularly well-suited various applications, such as gas turbine engines, oil and gas extraction, vehicle engines, and exhaust monitoring.