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Sensors 2018, 18(1), 2;

Measuring Liquid-Level Utilizing Wedge Wave

Department of Mechanical Engineering, Nagaoka University of Technology, Niigata 940-2188, Japan
Author to whom correspondence should be addressed.
Received: 1 November 2017 / Revised: 11 December 2017 / Accepted: 19 December 2017 / Published: 21 December 2017
(This article belongs to the Section Physical Sensors)
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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. View Full-Text
Keywords: liquid-level; wedge wave; ultrasound; FEM simulation liquid-level; wedge wave; ultrasound; FEM simulation

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Matsuya, I.; Honma, Y.; Mori, M.; Ihara, I. Measuring Liquid-Level Utilizing Wedge Wave. Sensors 2018, 18, 2.

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