N2 - It is convenient to have a device and a method of generating single cut-on modes in cylindrical hard-walled waveguides or at least in laboratory models of such systems. This allows to examine, among other things, properties of various active and/or passive elements inserted in a cylindrical duct by testing them in conditions when the incident (input) wave comprises only one cut-on mode and determining the reflection and transmission coefficients for single selected incident modes. As it has been already demonstrated by the present authors, it is possible to generate single cut-on modes in a circular duct using a small (although increasing with mode order) number of acoustic monopoles arranged properly on a duct cross-section and driven with appropriate acoustic volume amplitudes and phases. Laboratory models of such sources are proposed in this paper and results of tests verifying their directional properties are presented. The other technical issue relating to practical utilization of the proposed method is the possible error introduced by the apparatus used for scanning the acoustic field inside the duct model. It is shown that insertion of the measuring probe changes the total energy radiated into the free space only by a fraction of a decibel. L1 - http://journals.pan.pl/Content/101388/PDF/11_paper.pdf L2 - http://journals.pan.pl/Content/101388 PY - 2015 IS - No 2 EP - 255 DO - 10.1515/aoa-2015-0027 KW - circular hard-walled duct KW - modal structure KW - cut-on mode KW - circular duct modeling A1 - Gorazd, Ɓukasz A1 - Snakowska, Anna A1 - Jurkiewicz, Jerzy A1 - Flach, Artur PB - Polish Academy of Sciences, Institute of Fundamental Technological Research, Committee on Acoustics VL - vol. 40 DA - 2015[2015.01.01 AD - 2015.12.31 AD] T1 - On Certain Practical Issues Relating to Construction of the In-duct Single Mode Synthesizer SP - 247 UR - http://journals.pan.pl/dlibra/publication/edition/101388 T2 - Archives of Acoustics