Wilson Preston S, Roy Ronald A, Carey William M
Department of Aerospace and Mechanical Engineering, Boston University, 110 Cummington Street, Room 101, Boston, Massachusetts 02215, USA.
J Acoust Soc Am. 2003 Jun;113(6):3245-52. doi: 10.1121/1.1572140.
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.
报道了一种能够提高测量精度的充水阻抗管。该测量仪器采用了标准化双传感器传递函数技术的一种变体。通过最小化弹性波导效应以及使用硬壁安装的声压传感器实现了性能改进。发现充水阻抗管内的声传播可以用平面波模型很好地描述，这是该技术的一个必要条件。对压力释放端接传输线的阻抗以及水/空气界面的反射系数进行测量以验证该系统。
