Abstract: A fluid flow meter has a housing with a fluid inlet and a fluid outlet and defining therebetween a fluid flow path. The flow meter has a flexible membrane having a inlet end mounted at an inlet region of the fluid flow path and a outlet end mounted at an outlet region of the fluid flow path. The flexible membrane produces undulating motion in response to fluid flow in the fluid flow path. Fluid flow rate is measured by sensing the undulating motion of the membrane. Performance of the meter is enhanced by laminating a layer of material to the membrane.

Abstract: The fluid flow meter includes a flexible membrane formed of a flexible material and containing an apparatus for providing the membrane with resilience for undulation. The membrane is mounted in the fluid flow path such that the pair of faces simultaneously define with the housing fluid impermeable seals at least two different locations along the flow path. The membrane flexes so as to permit passage of discrete quanta of fluid, each having a known volume. The flow meter generates electrical signals corresponding to flexure of the membrane, and the electrical signals are monitored for determining a fluid flow rate.

Abstract: A fluid flow meter comprising a housing having a pair of fluid ports and defining therebetween a fluid flow path; a flexible membrane defining a pair of opposing faces and being mounted in the fluid flow path such that the pair of faces simultaneously define with the housing fluid impermeable seals at at least two different locations along the flow path, the membrane being operative to flex so as to permit passage therepast of discrete quanta of fluid, each having a known volume; apparatus for generating electrical signals corresponding to flexure of the membrane; and monitoring apparatus for receiving the electrical signals and thereby determining a fluid flow rate along the flow path.