Some New Developments in Fluidic Circuit Design

[+] Author and Article Information
T. M. Drzewiecki

Science and Technology Associates, Inc., Arlington, Va.

J. Dyn. Sys., Meas., Control 106(3), 231-235 (Sep 01, 1984) (5 pages) doi:10.1115/1.3149677 History: Received March 30, 1982; Online July 21, 2009


This paper presents several new developments in fluidic circuit design. The use of orifices and capillaries, as input and feedback resistors, and vice-versa, in an operational amplifier circuit is shown to result in a scaler whose gain varies either directly or inversely in proportion to kinematic viscosity. When operating on a temperature sensitive gainblock this scalar can be used to compensate for the effects of variable ambient temperature. The orifice formed by the space between a jet and a solid wall is a pressure sensitive resistance that is used as the controlling element in a gain changer and an automatically null-balanced Wheatstone bridge. In a novel use of a laminar proportional amplifier (LPA), the nonlinear saturation characteristic is used to linearize inversely nonlinear sensor and circuit outputs. Finally a set-point pressure sensor, that is a highly asymmetric LPA, is described that develops a high differential output pressure as a function of power jet pressure which can be some set-point pressure. By using this device as a pressure sensor, an ultra-quiet, high suppression performance pressure regulator has been built and demonstrated.

Copyright © 1984 by ASME
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