Abstract: Propagation of leaky Lamb waves in pipe walls is used to provide a clamp-on acoustic flow meter for single-phase fluid flow in pipes. The received acoustic signals can be analyzed analytically, or by matching to numerical models, or with machine learning. In a preferred embodiment, variation of penetration depth of the leaky Lamb waves into the fluid flow with frequency provides an approach for measuring flow rate vs. radius with a clamp-on flow meter.

Abstract: We provide a novel technique for coupling focused ultrasound into the brain. The ultrasound beam can be used for therapy or neuro-modulation. We excite a selected Lamb wave mode in the skull that mode converts into longitudinal waves in the brain. The benefits of our approach is in improved efficiency, reduction in heating of the skull, and the ability to address regions in the brain that are close or far from the skull.

Abstract: A method of multi-touch detection on a touchscreen by imparting Lamb waves inside a touchscreen, using a first ultrasound transducer having a polarization direction positioned to excite lowest order symmetric Lamb waves (S0), detecting the S0 Lamb waves, using a second ultrasound transducer, where the transducers are connected to the touchscreen, controlling the transducers to selectively and repeatedly pulse the output S0 Lamb waves output to propagate the S0 Lamb waves inside the touchscreen and reflect from each edge of the touchscreen to form a base signal distribution of S0 reverberant Lamb waves across the touchscreen, where a single or a multi-touch perturbation in the reverberant Lamb waves absorbs a portion of the base signal, where the absorption forms an alteration in the base signal and is seen as a signal variation by the controller when received by the second ultrasound transducer, where the controller identifies and locates the perturbation.

Abstract: A multi-touch ultrasonic touchscreen is provided that includes a solid plate, an ultrasonic transducer disposed on an edge or surface of the solid plate that is capable of transmitting and receiving dispersive acoustic Lamb waves, and an appropriately programmed computer that is capable of operating the ultrasonic transducer to transmit and receive the dispersive acoustic Lamb waves, where the solid plate is capable of reflecting the transmitted dispersive acoustic Lamb waves internally and at edges and corners of the plate in a ubiquitous distribution within the solid plate, where the internal reflections include solid plate top and bottom surface reflections of the dispersive acoustic Lamb waves, where the edge and corner reflections are physical reflection to propagation of the dispersive acoustic Lamb waves, where the appropriately programmed computer is capable of operating on the received Lamb wave to determine an occurrence and location of a touch to the solid plate.