Research Status of High-Temperature Fiber-Optic Sensors Based on Fabry-Perot Interferometry

The measurement of physical parameters under high-temperature environments is widely needed in fields such as aerospace engines (e.g., ramjet engines and supersonic combustion ramjet engines), gas turbines, and hypersonic vehicles. Monitoring and evaluating combustion instability phenomena through pulsating pressure measurements is beneficial for studying the mechanisms behind combustion instability, providing a basis for physical structural improvements of combustion chambers as well as for engine design and evaluation. It also contributes to improving engine control performance and operational safety. Fiber-optic sensing technology based on Fabry-Perot (FP) interferometry has attracted significant attention due to its advantages of small size and high-temperature resistance, which enable it to measure physical parameters in harsh environments such as in aerospace engines. This paper reviews domestic and international research on fiber-optic sensors based on FP interferometry. The focus is on analyzing the advantages and disadvantages of various fabrication methods for fiber-optic sensors, with the aim of summarizing the characteristics of each technique and providing new ideas for the engineering application of high-temperature fiber-optic FP sensing technology.