An improved water-filled impedance tube |
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Authors: | Wilson Preston S Roy Ronald A Carey William M |
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Institution: | Department of Aerospace and Mechanical Engineering, Boston University, 110 Cummington Street, Room 101, Boston, Massachusetts 02215, USA. psw@bu.edu |
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Abstract: | A water-filled impedance tube capable of improved measurement accuracy and precision is reported. The measurement instrument employs a variation of the standardized two-sensor transfer function technique. Performance improvements were achieved through minimization of elastic waveguide effects and through the use of sound-hard wall-mounted acoustic pressure sensors. Acoustic propagation inside the water-filled impedance tube was found to be well described by a plane wave model, which is a necessary condition for the technique. Measurements of the impedance of a pressure-release terminated transmission line, and the reflection coefficient from a water/air interface, were used to verify the system. |
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