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Abstract: The characteristic equation of Lamb waves in a solid plate with loading liquid on single side is derived. The dispersion curve is also calculated. A new method monitoring the fixed liquid level is presented and implemented, based on the sensitivity of the characteristic parameters, such as, attenuation, of some Lamb wave modes to the presence of liquid. The results show that the presence of liquid has little influence on the phase velocity dispersion curve and energy velocity dispersion curve, but great influence on the attenuation dispersion curve; the experimental results are in good agreement with the theoretical calculations and imply that this method is suitable for monitoring the fixed liquid level of large tanks.
Key words: Lamb waves Fixed liquid level measurement
Large tanks
CLC No: TB551 TG115.28 O348
国家自然科学基金(10272007, 60404017)和北京市自然科学基金(8062008, 4052008)资助项目. Received 20060815, received in revised form 20070110
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