Aircraft engine

Aircraft engine

Application Overview

High-temperature pressure sensors in aircraft engines primarily utilize the piezoresistive effect to convert pressure changes into electrical signals. When internal engine components (such as the compressor inlet chamber) are subjected to pressure, the piezoresistive elements (such as silicon-based pressure-sensitive resistors) within the sensor undergo strain-induced changes in resistance, which are then converted into measurable electrical signals via circuitry. ‌

 

Working Principle Details
‌The piezoresistive effect‌ is the core working principle:

 

When a silicon-based piezoresistive element is subjected to pressure, its resistance value changes with the pressure. Typically, a Wheatstone bridge structure is used to amplify the signal;
In high-temperature environments (e.g., above 200°C), special materials (such as polysilicon or sapphire substrates) must be used to ensure stability and avoid leakage issues associated with traditional PN junctions. ‌

 

Application Features
Must meet high-temperature (typically ≥125°C) and high-reliability requirements;
Fast dynamic response, enabling real-time monitoring of critical parameters such as engine intake pressure and combustion chamber pressure, ensuring thrust control and safety. ‌