Abstract
This research focus on exploring the effects moisture absorbed by a layer of hygroscopic film coated on the wedge tip along that anti-symmetric flexural (ASF) modes propagate. A shear wave transducer is applied to measure the signals of wedge wave propagating along the wedge tips. Velocity of the ASF mode is indicated to decrease while the moisture is absorbed by the hygroscopic film. Also, the amount of velocity reduction is indicated to be increasing as the moisture increases. Results of the current research suggest the ASF modes can be a new candidate for the application of acoustic sensor to detect moisture.
