Temperature compensation of lamb wave sensor by combined antisymmetric mode and symmetric mode

摘要

Both thermal sensitivity and mass sensitivity in liquid of the first antisymmetric (A_0) mode and the first symmetric (S_0) mode of Lamb wave biosensor were investigated. A_0 and S_0 modes are sensitive to the mass change on the surface of the sensor but A_0 mode is also sensitive to the liquid in the region of evanescent wave associated with Lamb wave. By combining A_0 mode and S_0 mode, the measurement error due to the environmental temperature drift decreased by a large factor, therefore, the environmental temperature was efficiently compensated without changing the structure of Lamb wave sensor.