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Theoretical, numerical, and experimental studies are performed to investigate the properties of both the A<jats:sub>0<\/jats:sub> 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 A<jats:sub>0<\/jats:sub> and quasi-Scholte modes are different. It is also found that the low-frequency A<jats:sub>0<\/jats:sub> 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.<\/jats:p>","DOI":"10.1155\/2017\/2596291","type":"journal-article","created":{"date-parts":[[2017,12,20]],"date-time":"2017-12-20T23:45:40Z","timestamp":1513813540000},"page":"1-11","source":"Crossref","is-referenced-by-count":10,"title":["Water Level Sensing in a Steel Vessel Using A<sub>0<\/sub> and Quasi-Scholte Waves"],"prefix":"10.1155","volume":"2017","author":[{"given":"Peng","family":"Guo","sequence":"first","affiliation":[{"name":"Key Laboratory of Condition Monitoring and Control for Power Plant Equipment of Ministry of Education, School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China"}]},{"given":"Bo","family":"Deng","sequence":"additional","affiliation":[{"name":"Key Laboratory of Condition Monitoring and Control for Power Plant 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