Dynamic pressure comparator

A dynamic pressure comparator for calibrating high frequency pressure transducers used for the measurement of rocket motor combustion instability and other transient phenomena includes an acoustic cylindrical cavity through which a jet stream of nitrogen is passed and at each of the opposite ends of which a transducer carrier is provided. Vortex systems and turbulence created as the jet enters and exits the cavity stimulate pressure transducers that are mounted in the carriers. The outputs of the transducers are monitored and compared as by the use of a spectrum analyzer. The comparator includes adjustments to vary the high frequency stimulus and the cavity pressure, and facilitates simulation of transducer installation in a given pressure measurement application, for example, on a rocket motor.