Impruving the accuracy of air stream speed measurement by the acoustic anemometer

摘要

Physical principles, being the basis of functioning of an acoustic anemometer are considered. The advanced model of anemometer channel, taking into account thickness of wails of duct is described. The results of calculations of the reflection coefficient at the opened end the duct with right-angled flanges for one of the normal modes at presence of air flow are presented. The field of acoustic pressure on the wail of anemometer channel is calculated, and the influence of walls thickness to the choice of optimum parameters of acoustic anemometer is evaluated.