Water Level Sensing in a Steel Vessel Using A0 and Quasi-Scholte Waves. (20th December 2017)

• Record Type: Journal Article
• Authors: Guo, Peng; Deng, Bo; Lan, Xiang; Zhang, Kaili; Li, Hongyuan; Tian, Zhenhua; Xu, Hong
• Other Names: Kaur Amardeep Academic Editor.
• Is Part Of: Journal of sensors. Volume 2017(2017)
• Publication Date: 2017-12-20
• Subjects: Detectors -- Periodicals; 681.205
• DOI: 10.1155/2017/2596291
• Languages: English
• ISSNs: 1687-725X

Abstract

Abstract : This paper presents a water level sensing method using guided waves of A0 and quasi-Scholte modes. Theoretical, numerical, and experimental studies are performed to investigate the properties of both the A0 and quasi-Scholte modes. The comparative study of dispersion curves reveals that the plate with one side in water supports a quasi-Scholte mode besides Lamb modes. In addition, group velocities of A0 and quasi-Scholte modes are different. It is also found that the low-frequency A0 mode propagating in a free plate can convert to the quasi-Scholte mode when the plate has one side in water. Based on the velocity difference and mode conversion, a water level sensing method is developed. For the proof of concept, a laboratory experiment using a pitch-catch configuration with two piezoelectric transducers is designed for sensing water level in a steel vessel. The experimental results show that the travelling time between the two transducers linearly increases with the increase of water level and agree well with the theoretical predictions.