{"id":709,"date":"2013-01-15T12:00:56","date_gmt":"2013-01-15T12:00:56","guid":{"rendered":"https:\/\/www.akustik-forschung.de\/test\/?p=709"},"modified":"2025-05-27T08:52:12","modified_gmt":"2025-05-27T06:52:12","slug":"impedanzrohr-acoustitube","status":"publish","type":"post","link":"https:\/\/www.akustikforschung.de\/en\/produkte\/messgerate\/impedanzrohr-acoustitube\/","title":{"rendered":"Impedance tube AcoustiTube<sup>&reg;<\/sup>"},"content":{"rendered":"<p><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2018\/01\/aed1000_18_ws.jpg\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-9703 size-full\" style=\"margin-top: 0px;\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2018\/01\/aed1000_18_ws.jpg\" alt=\"Impedance tube AcoustiTube&lt;sup&gt;&amp;reg;&lt;\/sup&gt; with accessories for measurement of sound absorption\" width=\"618\" height=\"600\" srcset=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2018\/01\/aed1000_18_ws.jpg 618w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2018\/01\/aed1000_18_ws-300x291.jpg 300w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2018\/01\/aed1000_18_ws-440x427.jpg 440w\" sizes=\"auto, (max-width: 618px) 100vw, 618px\" \/><\/a><\/p>\n<p>The impedance tube AcoustiTube<sup>\u00ae<\/sup> is a measuring system for determining the sound absorption coefficient, the sound reflection factor and the impedance ratio of materials in the laboratory on the basis of the transfer function method described in DIN EN ISO 10534-2, ASTM E1050 and VW Test specification PV 8223.<\/p>\n<p>The extension of the impedance tube to a transmission tube allows the additional measurement of the characteristic absorber values and the transmission loss of open-cell materials according to ASTM E2611.<\/p>\n<p>By means of a special compression specimen holder, the material parameters can be measured under defined compression as well.<\/p>\n<p>By means of an adapter, the sound absorption coefficient of a road surface according to DIN ISO 13472-2 in situ can be determined nondestructively.<\/p>\n<p>To <a href=\"#Anker_Quick_Setup_Guide\">Quick Setup Guide<\/a> of impedance tube AcoustiTube<sup>\u00ae<\/sup>.<\/p>\n<p><!--contentpartdivider--><\/p>\n<h4>Principle of impedance tube (Kundt&#8217;s tube)<\/h4>\n<p>In the impedance tube a plane sound wave is generated and sent against a sound absorbing specimen in front of a reverberant termination. The resulting sound pressure is measured by using two microphones in front of the material sample. The sound absorption coefficient of the material is determined by evaluating the incoming and reflected sound energy.<\/p>\n<h4>Specimen holders<\/h4>\n<h5>Type I<\/h5>\n<ul>\n<li>Application: determination of sound absorption coefficient of materials in the laboratory according to DIN EN ISO 10534-2, ASTM E1050 and VW Test specification PV 8223<\/li>\n<li>Specimens:\n<ul>\n<li>cylindrical specimens with a diameter of 15\u00a0mm, 30\u00a0mm, 40\u00a0mm or 100\u00a0mm<\/li>\n<li>cuboid specimens with height x width of 50 mm x 50\u00a0mm<\/li>\n<\/ul>\n<\/li>\n<li>Method: prepared cylindrical or cuboid specimens of variable thickness are mounted and sealed into the specimen holder, which can be continuously positioned and adjusted<\/li>\n<\/ul>\n<h5>Type II<\/h5>\n<ul>\n<li>Application: determination of sound absorption coefficient in situ according to DIN ISO 13472-2 (sound absorption coefficient &lt; 0,15)<\/li>\n<li>Specimens: road surfaces and plates of specimens with a dimension of at least 300 mm x 300 mm<\/li>\n<li>Method: adapter for tight attachment of impedance tube to the surface of the specimen<\/li>\n<\/ul>\n<h4>Software<\/h4>\n<p>The measurement system AcoustiTube<sup>\u00ae<\/sup> is supported by the analysis software AcoustiStudio &#8211; Module Sound Absorption.<\/p>\n<ul>\n<li>determination of material properties as a function of frequency<\/li>\n<li>averaging of results of various material samples, frequency ranges and impedance tubes<\/li>\n<li>simple management and comparability of results by application of database<\/li>\n<\/ul>\n<p>The analysis software AcoustiStudio allows the application of impedance tubes of arbitrary geometry.<\/p>\n<h4 id=\"Anker_Quick_Setup_Guide\">Quick Setup Guide of impedance tube AcoustiTube<sup>\u00ae<\/sup><\/h4>\n<div style=\"width: 600px;\" class=\"wp-video\"><video class=\"wp-video-shortcode\" id=\"video-709-2\" width=\"600\" height=\"338\" poster=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2025\/02\/impedanzrohr_acoustitube_quick_setup_guide_ed_ws.png\" preload=\"metadata\" controls=\"controls\"><source type=\"video\/mp4\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2025\/02\/Impedance-Tube-AcoustiTube-Quick-Setup-Guide-Acoustic-Engineering-Dresden-AED.mp4?_=2\" \/><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2025\/02\/Impedance-Tube-AcoustiTube-Quick-Setup-Guide-Acoustic-Engineering-Dresden-AED.mp4\">https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2025\/02\/Impedance-Tube-AcoustiTube-Quick-Setup-Guide-Acoustic-Engineering-Dresden-AED.mp4<\/a><\/video><\/div>\n<p>To <a href=\"https:\/\/www.youtube.com\/watch?v=kvaJODNTrKU\" target=\"_blank\" rel=\"noopener\">Quick Setup Guide<\/a> for impedance tube AcoustiTube on YouTube<sup>\u00ae<\/sup>.<\/p>\n<h4>Extension of impedance tube to transmission tube<\/h4>\n<p>An <a title=\"overview acoustitube\" href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2013\/03\/overview_acoustitube.pdf\" target=\"_blank\" rel=\"noopener\">extension<\/a> of the impedance tube AcoustiTube<sup>\u00ae<\/sup> to the transmission tube with analysis software AcoustiStudio &#8211; Module Sound Transmission allows the determination of the characteristic absorber values (wave number and characteristic impedance), the transmission coefficient and the sound insulation (transmission loss) by applying the Two-Load Method with 4 microphones according to ASTM E2611 (Transmission Matrix Method).<\/p>\n<p>On such basis, the insertion loss of mufflers (see software for acoustic design of mufflers <a href=\"https:\/\/www.akustikforschung.de\/en\/produkte\/software\/schalldampfer-software-aed-8001-acousticalc\/\">AcoustiCalc<sup>\u00ae Silencer<\/sup><\/a>) and the diffuse sound absorption coefficient (see software for acoustic design of sound absorbers <a href=\"https:\/\/www.akustikforschung.de\/en\/produkte\/software\/schallabsorber-software-aed-3001-acousticalc-absorber\/\">AcoustiCalc<sup>\u00ae Absorber<\/sup><\/a>, comparison to measurements in the reverberation chamber according to DIN\u00a0EN\u00a0ISO\u00a0354, especially rated sound absorption coefficient of the material according to DIN\u00a0EN\u00a0ISO\u00a011654) can be computed directly (see <a title=\"Overview Measuring Systems vs. Analysis Software\" href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2018\/01\/Measuring_Instruments_vs_Analysis_Software_Overview.pdf\" target=\"_blank\" rel=\"noopener\">overview<\/a> measuring systems vs. analysis software).<\/p>\n<p>Optional extensions of the transmission tube also allow the alternative application of the Two-Source Method with 4 microphones or the Two-Load Method with 3 microphones to measure the characteristic absorber values and the transmission loss. Furthermore, it is possible the determine the transmission loss of open-cell material specimens as well as silencers and mufflers according to DIN EN ISO 11820.^<\/p>\n<p><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2025\/02\/acoustitube_impedanzrohr_messung_schallabsorption_schalltransmission_rechteckige_proben_04_ws.png\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone wp-image-12303\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2025\/02\/acoustitube_impedanzrohr_messung_schallabsorption_schalltransmission_rechteckige_proben_04_ws.png\" alt=\"Extension of impedance tube AcoustiTube&amp;reg; for cuboid specimens to transmission tube\" width=\"600\" height=\"157\" \/><\/a><\/p>\n<h4>Compression specimen holder for impedance tube<\/h4>\n<p>As of now, a novel compression specimen holder extends the application range of the impedance tube, transmission tube and the airflow resistivity meter <a href=\"https:\/\/www.akustikforschung.de\/en\/produkte\/messgerate\/stromungswiderstandsmessgerat-aed-300-acoustiflow\/\">AcoustiFlow<sup>\u00ae<\/sup><\/a>.<\/p>\n<p>The specimen holder can be adjusted nearly continuously. Therefore, it allows the defined compression of cylindrical specimens and fills to measure the sound absorption coefficient, characteristic absorber values, transmission loss and the airflow resistance. Also, thin fabrics, granular fills as well as multi-layer systems can be installed with control.<\/p>\n<blockquote>\n<h4>Technical Data<\/h4>\n<h5>Impedance tube<\/h5>\n<ul>\n<li>Type I for cylindrical specimens\n<ul>\n<li>Inner diameter: 40 mm<\/li>\n<li>Frequency range: 100 Hz &#8211; 4.950 Hz<\/li>\n<\/ul>\n<\/li>\n<li>Type II for cylindrical specimens\n<ul>\n<li>Inner diameter: 100 mm<\/li>\n<li>Frequency range: 50 Hz &#8211; 2.000 Hz<\/li>\n<\/ul>\n<\/li>\n<li>Type III for cylindrical specimens\n<ul>\n<li>Inner diameter: 30 mm<\/li>\n<li>Frequency range: 150 Hz &#8211; 6.600 Hz<\/li>\n<\/ul>\n<\/li>\n<li>Type IV for cylindrical specimens\n<ul>\n<li>Inner diameter: 15 mm<\/li>\n<li>Frequency range: 150 Hz &#8211; 10.200 Hz<\/li>\n<\/ul>\n<\/li>\n<li>Type V for cuboid specimens\n<ul>\n<li>Internal dimensions height x width: 50\u00a0mm x 50 mm<\/li>\n<li>Frequency range: 90\u00a0Hz &#8211; 3.400\u00a0Hz<\/li>\n<\/ul>\n<\/li>\n<li>Thickness of specimen\n<ul>\n<li>Impedance tube: 260 mm<\/li>\n<li>Transmission tube: 80 mm<\/li>\n<li>Compression specimen holder: 360 mm<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h5>Microphones<\/h5>\n<ul>\n<li>Type: 1\/4&#8243;, BNC (female), class 1<\/li>\n<li>Frequency range: 20 Hz &#8211; 20 kHz<\/li>\n<\/ul>\n<h5>Data acquisition<\/h5>\n<ul>\n<li>2\/4 simultaneously sampled analog input channels, BNC, IEPE-conditioning<\/li>\n<li>compatible to MATLAB<sup>*<\/sup> and LabVIEW<sup>**<\/sup><\/li>\n<\/ul>\n<h5>Requirements<\/h5>\n<ul>\n<li>Personal computer: Windows 7 \/ 8 \/ 10, 2x USB-interface<\/li>\n<li>Power supply: 230 V (AC), 50 Hz<\/li>\n<li>Ambient air temperature: 5 \u00b0C &#8211; 60 \u00b0C<\/li>\n<\/ul>\n<\/blockquote>\n<p><sup>*<\/sup> <sup>MATLAB is a registered trademark of The Math Works, Inc.<\/sup><br \/>\n<sup>**<\/sup> <sup>LabVIEW is a registered trademark of the National Instruments Corporation<\/sup><\/p>\n<p><!--contentpartdivider--><\/p>\n<div id=\"attachment_5214\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2013\/01\/messung_schallabsorptionsgrad_fahrbahn_insitu_07_ed_ws.jpg\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-5214\" class=\"wp-image-5214 size-medium\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2013\/01\/messung_schallabsorptionsgrad_fahrbahn_insitu_07_ed_ws-300x400.jpg\" alt=\"Determination of parameters of road surfaces in situ\" width=\"300\" height=\"400\" srcset=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2013\/01\/messung_schallabsorptionsgrad_fahrbahn_insitu_07_ed_ws-300x400.jpg 300w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2013\/01\/messung_schallabsorptionsgrad_fahrbahn_insitu_07_ed_ws-365x487.jpg 365w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2013\/01\/messung_schallabsorptionsgrad_fahrbahn_insitu_07_ed_ws.jpg 450w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-5214\" class=\"wp-caption-text\">Measurement of sound absorption coefficient of road surfaces in situ with AcoustiTube<sup>\u00ae<\/sup><\/p><\/div>\n<div id=\"attachment_12155\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2025\/02\/acoustitube_schallausbreitung_transmissionsrohr_01bt.gif\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-12155\" class=\"wp-image-12155\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2025\/02\/acoustitube_schallausbreitung_transmissionsrohr_01bt.gif\" alt=\"Formation of standing wave between basic module and material specimen as well as continuously propagating sound wave between material specimen and sound absorbing termination (free field)\" width=\"300\" height=\"130\" \/><\/a><p id=\"caption-attachment-12155\" class=\"wp-caption-text\">Sound propagation inside of transmission tube AcoustiTube<sup>\u00ae<\/sup><\/p><\/div>\n<div id=\"attachment_11504\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/05\/acoustistudio_modul_schallabsorption_04_schallabsorptionsgrad_ws.png\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-11504\" class=\"wp-image-11504 size-medium\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/05\/acoustistudio_modul_schallabsorption_04_schallabsorptionsgrad_ws-300x234.png\" alt=\"Software impedance tube for measurement of sound absorption coefficient\" width=\"300\" height=\"234\" srcset=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/05\/acoustistudio_modul_schallabsorption_04_schallabsorptionsgrad_ws-300x234.png 300w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/05\/acoustistudio_modul_schallabsorption_04_schallabsorptionsgrad_ws-640x499.png 640w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/05\/acoustistudio_modul_schallabsorption_04_schallabsorptionsgrad_ws-768x599.png 768w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/05\/acoustistudio_modul_schallabsorption_04_schallabsorptionsgrad_ws.png 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-11504\" class=\"wp-caption-text\">Analysis software AcoustiStudio &#8211; Module Sound Absorption<\/p><\/div>\n<div id=\"attachment_9708\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2018\/01\/aed1200_10_ws.jpg\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-9708\" class=\"wp-image-9708 size-medium\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2018\/01\/aed1200_10_ws-300x139.jpg\" alt=\"Transmission tube for measurement of characteristic absorber values, transmission coefficient and sound insulation\" width=\"300\" height=\"139\" srcset=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2018\/01\/aed1200_10_ws-300x139.jpg 300w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2018\/01\/aed1200_10_ws-768x355.jpg 768w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2018\/01\/aed1200_10_ws-640x296.jpg 640w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2018\/01\/aed1200_10_ws-440x204.jpg 440w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2018\/01\/aed1200_10_ws.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-9708\" class=\"wp-caption-text\">Extension of measuring system AcoustiTube<sup>\u00ae<\/sup> to AED 1200 (Type I to III)<\/p><\/div>\n<div id=\"attachment_11505\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/05\/acoustistudio_modul_schalltransmission_04_schalldaemmung_ws.png\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-11505\" class=\"wp-image-11505 size-medium\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/05\/acoustistudio_modul_schalltransmission_04_schalldaemmung_ws-300x234.png\" alt=\"Transmission tube for measurement of characteristic absorber values, transmission coefficient and sound insulation\" width=\"300\" height=\"234\" srcset=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/05\/acoustistudio_modul_schalltransmission_04_schalldaemmung_ws-300x234.png 300w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/05\/acoustistudio_modul_schalltransmission_04_schalldaemmung_ws-640x499.png 640w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/05\/acoustistudio_modul_schalltransmission_04_schalldaemmung_ws-768x599.png 768w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/05\/acoustistudio_modul_schalltransmission_04_schalldaemmung_ws.png 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-11505\" class=\"wp-caption-text\">Analysis software AcoustiStudio &#8211; Module Sound Transmission<\/p><\/div>\n<div id=\"attachment_11498\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/05\/acoustitube_overview_ws.png\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-11498\" class=\"wp-image-11498 size-medium\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/05\/acoustitube_overview_ws-300x202.png\" alt=\"Impedance tube \/ transmission tube for measurement of sound absorption coefficient, characteristik absorber values, , transmission loss\" width=\"300\" height=\"202\" srcset=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/05\/acoustitube_overview_ws-300x202.png 300w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/05\/acoustitube_overview_ws-640x431.png 640w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/05\/acoustitube_overview_ws-768x518.png 768w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/05\/acoustitube_overview_ws.png 1024w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-11498\" class=\"wp-caption-text\"><a title=\"overview acoustitube\" href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2021\/05\/AcoustiTube_Overview.pdf\" target=\"_blank\" rel=\"noopener\">Overview<\/a> of measuring system AcoustiTube<sup>\u00ae<\/sup><\/p><\/div>\n<div id=\"attachment_12124\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2025\/02\/Measuring_Instruments_vs_Analysis_Software_Overview_ws.png\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-12124\" class=\"wp-image-12124\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2025\/02\/Measuring_Instruments_vs_Analysis_Software_Overview_ws.png\" alt=\"Interaction of measuring systems and analysis software for acoustic design of mufflers and silencers and multi-layer systems of absorbers\" width=\"300\" height=\"215\" \/><\/a><p id=\"caption-attachment-12124\" class=\"wp-caption-text\"><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2025\/02\/Measuring_Instruments_vs_Analysis_Software_Overview.pdf\">Overview<\/a> of measuring systems vs. analysis software for acoustic design of mufflers and silencers and multi-layer systems of absorbers<\/p><\/div>\n<div id=\"attachment_10583\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2019\/03\/aed1200_20_ed3_ws.jpg\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-10583\" class=\"wp-image-10583 size-medium\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2019\/03\/aed1200_20_ed3_ws-300x186.jpg\" alt=\"Impedance tube AcoustiTube&lt;sup&gt;&amp;reg;&lt;\/sup&gt;\" width=\"300\" height=\"186\" srcset=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2019\/03\/aed1200_20_ed3_ws-300x186.jpg 300w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2019\/03\/aed1200_20_ed3_ws-768x477.jpg 768w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2019\/03\/aed1200_20_ed3_ws-640x398.jpg 640w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2019\/03\/aed1200_20_ed3_ws-440x273.jpg 440w, https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2019\/03\/aed1200_20_ed3_ws.jpg 800w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-10583\" class=\"wp-caption-text\">Extension to transmission tube with terminating cap and support for microphone for application of Two-Load Method with 3 microphones<\/p><\/div>\n<div id=\"attachment_12121\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2025\/02\/acoustitube_modul_schallabsorption_kompressionsprobenhalter_ed_ws.png\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-12121\" class=\"wp-image-12121\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2025\/02\/acoustitube_modul_schallabsorption_kompressionsprobenhalter_ed_ws.png\" alt=\"Impedanzrohr AcoustiTube&lt;sup&gt;&amp;reg;&lt;\/sup&gt;\" width=\"300\" height=\"124\" \/><\/a><p id=\"caption-attachment-12121\" class=\"wp-caption-text\">Compression specimen holder for measurement of sound absorption coefficient, characteristic absorber values and transmission coefficient of compressed materials, fills, fabrics and multi-layer systems<\/p><\/div>\n<div id=\"attachment_12299\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2025\/02\/acoustitube_kompressionsprobenhalter_40mm_koffer_02_ws.png\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-12299\" class=\"wp-image-12299\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2025\/02\/acoustitube_kompressionsprobenhalter_40mm_koffer_02_ws.png\" alt=\"optional accessory to airflow resistivity meter AcoustiFlow&amp;reg; as well as impedance tube AcoustiTube&amp;reg; for measurement of airflow resistance as well as sound absorption coefficient and transmission loss of both fills and open-cell materials under compressed installation\" width=\"300\" height=\"278\" \/><\/a><p id=\"caption-attachment-12299\" class=\"wp-caption-text\">Reproducible installation of cylindrical material sample with defined compression for measuring the sound absorption coefficient and the sound insulation<\/p><\/div>\n<p><div id=\"attachment_12117\" style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2025\/02\/acoustitube_schallabsorbierende_referenzprobe_formstabil_ws.png\" rel=\"gallery\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-12117\" class=\"wp-image-12117\" src=\"https:\/\/www.akustikforschung.de\/wp-content\/uploads\/2025\/02\/acoustitube_schallabsorbierende_referenzprobe_formstabil_ws.png\" alt=\"Calibration standard\" width=\"300\" height=\"305\" \/><\/a><p id=\"caption-attachment-12117\" class=\"wp-caption-text\">Dimensionally stable, sound-absorbing reference test specimen with long-term acoustic properties (long-term stability)<\/p><\/div><\/p>","protected":false},"excerpt":{"rendered":"<p><\/br>The impedance tube AcoustiTube<sup>\u00ae<\/sup> is a measuring system for determining the sound absorption coefficient, the sound reflection factor and the impedance ratio of materials in the laboratory on the basis of the Transfer-function method described in DIN EN ISO 10534-2, ASTM E1050 and VW Test specification PV 8223.<\/p>\n<p>The extension of the impedance tube to a transmission tube allows the additional measurement of the characteristic absorber values and the transmission loss of open-cell materials according to ASTM E2611.<\/p>\n<p>By means of a special compression specimen holder, the material parameters can be measured under defined compression as well.<\/p>\n<p>By means of an adapter, the sound absorption coefficient of a road surface according to DIN ISO 13472-2 in situ can be determined nondestructively.<\/p>\n<p>To <a href=\"https:\/\/www.youtube.com\/watch?v=kvaJODNTrKU\" rel=\"noopener\" target=\"_blank\">Quick Setup Guide<\/a>.<\/p>\n","protected":false},"author":1,"featured_media":9703,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[32],"tags":[402,563,564,337,227,341,365,255,40,41,121,375,376,137,47,738,38,65,168,387,568,569,388,389],"class_list":["post-709","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-messgerate","tag-absorbervalues","tag-astm-e1050","tag-astm-e2611","tag-din-en-iso-10534-2","tag-din-en-iso-11820","tag-din-iso-13472-2","tag-fahrbahn","tag-fahrbahnoberflache","tag-impedanzmessrohr","tag-impedanzrohr","tag-in-situ","tag-kundtsches-rohr","tag-messgerat","tag-messsystem","tag-messung","tag-pv-8223","tag-schallabsorptionsgrad","tag-schalldammung","tag-schalldampfer","tag-transmissionsrohr","tag-two-load-methode","tag-two-source-methode","tag-ubertragungsfunktion","tag-ubertragungsmatrix","has-content-parts","content-parts-5"],"yoast_head":"<!-- This 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