04893496 is referenced by 43 patents and cites 3 patents.

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. Diamond, polyhedral and curved-sided embodiments are described. In another embodiment, the sensor body responds to fluid viscosity. This embodiment is preferably hollow, and may include threaded, fractal or roughened surface features to enhance viscous coupling. Different systems include further sensors, sensors with portions of differing profile, and special mounting or activation structures.

Title
Torsional wave fluid sensor and system
Application Number
7/257714
Publication Number
4893496
Application Date
October 14, 1988
Publication Date
January 16, 1990
Inventor
Toan H Nguyen
Needham
MA, US
Lawrence C Lynnworth
Waltham
MA, US
Jin O Kim
Philadelphia
PA, US
Haim H Bau
Swarthmore
PA, US
Agent
Lahive & Cockfield
Assignee
Panametrics
MA, US
IPC
G01N 9/24
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