Nonintrusive pressure measurement.

摘要

Pressure within a cylindrical shell (10) is measured by generating acoustic waves in the shell in a manner which minimizes the propagation of any appreciable vibrational energy to its mechanical supports. The mode of the generated vibration is chosen from among the banded resonance vibrations which can be generated in a cylindrical shell (10), the chosen banded resonance having an even number of longitudinally extending nodes parallel to the portion of the shell within which the vibration exists. Stress variation in the cylindrical shell due to the contained pressure causes a change in the banded resonant frequency which is monitored as a measure of the pressure.