Study of an Experimental Probe for the Measurement of the Acoustic Pressure inside an Airflow

摘要

The turbulence generated by the presence of a microphone, placed to study the origin of noise of an aircraft in motion, and the effect it has upon the measurements of acoustic pressure within the fluids in motion are discussed. An acoustic probe, designed to reduce the influence of the instrument during such measurements is described. The principle of the probe is reported and performance tests on the probe and their results are evaluated.