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Determination Of Pressure Changes In Fluids By Means Of Gas Bubbles

The subject matter of this paper is the presentation of a new method for the determination of high frequency pressure fluctuations in a liquid. The objective is to perform this measurement without any significant disturbance of the fluid. This technique utilizes gas bubbles in a liquid and evaluates dynamically the laser light scattered by the bubbles. it should be emphasized, that this type of measurement requires the use of an insoluble gas. Hence, the size of the bubble depends on the fluid pressure and on the surface tension. Thus, changes in the fluid pressure cause bubble size variation and modulation of the scattered intensity. The corresponding frequency is thus a measure for the rate of growth of the bubble and provides direct information about the changes in the fluid pressure. The theoretical interpretation was tested in an experiment and compares well with experimental results. This technique could be of considerable importance to the study of cavitation, bubble implosion and other dynamic phenomena in fluids.