The Fluidic Load Cell

[+] Author and Article Information
Tadeusz M. Drzewiecki

Fluidic Systems Research Branch, Harry Diamond Laboratories, Washington, D.C.

J. Dyn. Sys., Meas., Control 96(3), 358-360 (Sep 01, 1974) (3 pages) doi:10.1115/1.3426815 History: Received May 22, 1974; Online July 13, 2010


A possible fluidic load cell design consists of three parts: a structural member that deforms linearly with load, a fluidic strain gage having fluidic resistance that changes with deformation, and a three-stage laminar proportional amplifier-gain block that amplifies the change in strain gage through-flow to useful levels. This Technical Brief presents design relations for the first two parts of such a system. Two compressive load cells were built, incorporating different fabrication techniques and deformation-sensing methods. The loading range of these cells is about 0 to 20 kN (0 to 2 tons) with a dynamic range greater than 100 and a typical full-scale output pressure of 30 pascals (4 × 10−3 psi). Possible applications for fluidic load cells include force measurements in highly incendiary or radiative environments and/or when other fluid control circuitry is used.

Copyright © 1974 by ASME
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