Meggitt has developed piezoelectric dynamic pressure sensors for many aviation applications for extreme temperature environments. The force created on the diaphragm is applied to the piezoelectric stack, which produces an electric signal charge. The secondary effect of vibration is internally compensated. Thus the generated signal is purely proportional to the dynamic pressure applied to the diaphragm. The working temperatures of these transducers can be higher than 700°C. These types of transducers are used mainly for jet pipe resonance detection on various engines for military applications. State of the art devices have also been released with two channels, in order that redundancy is "built in," and a better interface provided for BITE functions.
Pictured dynamic pressure transducer for high temperature applications.