Abstract
The frequency characteristics of cavity mounted pressure measuring systems are presented as functions of three dimensionless parameters: the ratio of receiving cavity volume to sensing hole volume, the ratio of hole thickness to hole diameter, and the nondimensional amplitude of signal pressure.
The analysis is based on the orifice dynamics theory developed by J.E. Funk, et al. The experimental work has been conducted for various sizes of sensing-holes and cavities, and for signal amplitudes of 1, 2 and 4 millibars. The derived theoretical frequency response curves, especially, the resonant frequencies and the corresponding maxima (peak values) of the responses have good agreement with the experimental results in wide ranges of the above three parameters.
Therefore, it is concluded that, when a pressure transducer is mounted on a cavity of ordinary size and configuration, the effect of signal (pressure) amplitude on the transducer's frequency characteristics cannot be neglected, even for a pressure amplitude as small as a few millibars.
