1
Haim H Bau, Jin O Kim, Lawrence C Lynnworth, Toan H Nguyen: Torsional wave fluid sensor and system. Panametrics, Lahive & Cockfield, January 16, 1990: US04893496 (43 worldwide citation)

A guided torsional wave sensor has a cross-section with a strong interaction of torsional wave energy and the surrounding fluid, such that a wave propagates in the sensor with a functional dependence on a single fluid characteristic. In one embodiment, the sensor body is optimized for fluid density. ...


2
Bau Haim H, Kim Jin O, Lynnworth Lawrence C, Nguyen Toan H: Improved torsional wave fluid sensor and system.. Panametrics, April 18, 1990: EP0364217-A2 (8 worldwide citation)

A guided torsional wave sensor has a cross-section with a strong interaction of torsional wave energy and the surrounding fluid, such that a wave propagates in the sensor with a functional dependence on a single fluid characteristic. In one embodiment, the sensor body is optimized for fluid density. ...


3
METHOD AND APPARATUS FOR ACOUSTICAL POWER TRANSFER AND COMMUNICATION USING STEEL WEDGES. RENSSELAER POLYTECHNIC INSTITUTE, January 12, 2017: US20170009573-A1

Systems and methods for transmitting power and information using acoustic energy produced by transducers are provided. The systems have particular application for powering and communication with electronics through drilling and pipe systems. Pairs of acoustic wedges holding transducers are provided ...