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| Mason's Impedance Tube
is further evidence of the Company’s commitment to continual improvement
through research and development. This device, which is also known as a
standing wave tube, is constructed in accordance with International
Standards and is used by Mason in product development and quality
control. Impedance tubes are used to assess the absorption properties of acoustical materials. Tests are carried out by mounting specimen materials at one end of the tube with a calibrated sound source at the other end of the tube. The sound source produces an acoustic wave which travels down the pipe and reflects from the test sample. The phase interference between the waves in the pipe which are incident upon and reflected from the test sample will result in the formation of a standing wave pattern in the pipe. A single 13mm microphone, mounted on a moveable carriage that can be moved longitudinally along the tube, records data from the standing wave. This data is used to compute the absorption properties of the sample. The Mason apparatus has proven to be an invaluable assistance in the development of Mason acoustic wedges which are used in Mason Anechoic Chambers - an anechoic chamber simulates a free field environment by eliminating reverberation within the chamber. To achieve this condition the room is lined with anechoic wedges which have extremely high absorption properties. Through extensive testing in the Mason Impedance Tube in accordance with ASTM C384-90a Standard Test Method for Impedance and Absorption of Acoustical Materials by the Impedance Tube Method, Mason has been able to develop a range of anechoic wedges which meet the extremely high specification for these products.
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