Thus, the efficiency and emissions of these turbines have a significant impact on the environment and are strictly regulated. In order to reduce nitrogen oxide emissions, lean fuel mixtures are increasingly being burned in modern gas turbines. Unfortunately, this type of lean combustion can give rise to self-excited combustion instabilities. These instabilities are a resonant phenomenon, meaning after the first occurrence it becomes a self-reinforcing process that can, at worst, lead to the complete destruction of a turbine. When combustion oscillation occurs, it always reduces turbine efficiency and significantly decreases service life. To prevent this from happening, pressure sensors are used in gas turbine combustion chambers to detect initial combustion instability. At this early stage, the turbine can be adjusted with little effort for smooth and steady combustion. High-performance piezoelectric sensors can even detect a dangerous flameout through a characteristic drop in pressure. Ideally, you could save yourself the implementation of a flame-out monitoring system.