Abstract
A two-port local resonating (TPLR) method for thin-film Lamb wave sensor is proposed. Based on properties of multi-modes analyzed by numerical simulation and experimental measurement, the TPLR method is able to generate the second-order flexural mode A 02 (A 0i , i = 2). Density and sound velocity of liquid solutions can be decoupled based on the first-order flexural mode A 01 (A 0i , i = 1) and the A 02 mode, and solutions with the same density, such as CH 3 CH 2 OH and CH 3 OH, can be successfully distinguished on a single Lamb wave device. When the phase velocity of A 02 mode is close to the sound velocity of liquid, compared with the traditional delay-line configuration, smaller period of interdigital transducers and device miniaturization by the TPLR method can be realized. Generation of new modes with the TPLR method demonstrates an alternative for multi-parameters sensing of Lamb wave sensors.
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