title: The range equation of the ultrasonic link in gas media.
abstract: The paper presents a few chosen issues concerning the conditions that must be met to render possible the effective use of ultrasonic waves in active and passive applications in various gas media. The basic parameters of the gas medium influencing the transmission of ultrasonic waves in this kind of medium were discussed. An analysis of the range equation of the ultrasonic coupler in the gas medium and the computer model of the link in the stationary medium conditions were presented. An equation for the level of power decrease in the link was formulated and the calculated and measured characteristics of the level of power decrease for a few ultrasonic transducers working in the band of 20-100 kHz were presented in graphs.
authors.affiliation: Institute of Telecommunications, Teleinformatics and Acoustics, Wroclaw University of Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland. tadeusz.gudra@pwr.wroc.pl <tadeusz.gudra@pwr.wroc.pl>
authors.forename: T
authors.initials: T
authors.lastname: Gudra
authors.forename: K J
authors.initials: KJ
authors.lastname: Opielinski