Matsuya Iwao, Honma Yudai, Mori Masayuki, Ihara Ikuo
Department of Mechanical Engineering, Nagaoka University of Technology, Niigata 940-2188, Japan.
Sensors (Basel). 2017 Dec 21;18(1):2. doi: 10.3390/s18010002.
A new technique for measuring liquid-level utilizing wedge wave is presented and demonstrated through FEM simulation and a corresponding experiment. The velocities of wedge waves in the air and the water, and the sensitivities for the measurement, are compared with the simulation and the results obtained in the experiments. Combining the simulation and the measurement theory, it is verified that the foundation framework for the methods is available. The liquid-level sensing is carried out using the aluminum waveguide with a 30° wedge in the water. The liquid-level is proportional to the traveling time of the mode 1 wedge wave. The standard deviations and the uncertainties of the measurement are 0.65 mm and 0.21 mm using interface echo, and 0.39 mm and 0.12 mm utilized by end echo, which are smaller than the industry standard of 1.5 mm. The measurement resolutions are 7.68 μm using the interface echo, which is the smallest among all the guided acoustic wave-based liquid-level sensing.
本文提出了一种利用楔形波测量液位的新技术，并通过有限元模拟和相应实验进行了演示。将空气中和水中楔形波的速度以及测量灵敏度与模拟结果和实验所得结果进行了比较。结合模拟和测量理论，验证了该方法的基础框架是可行的。在水中使用带有30°楔形的铝制波导进行液位传感。液位与模式1楔形波的传播时间成正比。使用界面回波时测量的标准偏差和不确定度分别为0.65毫米和0.21毫米，使用端面回波时为0.39毫米和0.12毫米，均小于1.5毫米的行业标准。使用界面回波时的测量分辨率为7.68微米，这在所有基于导声波的液位传感中是最小的。
