A turbulator adapted to be mounted to or inserted in an inlet portion of a flow meter for a ventilator is disclosed. The turbulator is adapted to create a turbulent gas flow in the inlet portion downstream of the turbulator upon passage of a gas flow therethrough. A flow meter for a ventilator is provided. The flow meter may comprise such turbulator. The turbulator may be arranged in the inlet portion of the flow meter. A membrane for a ventilator flow meter is provided, as well as a flow meter comprising the membrane. A flow meter comprising a turbulator and a membrane is disclosed.

An optofluidic flow meter to determine a rate of fluid flow in a flow member includes: the flow member; a primary fluid conduit disposed in the flow member and that receives a fluid; a secondary fluid conduit disposed in the flow member; and a fiber optic comprising a fiber Bragg grating interposed between a first flow region of the primary fluid conduit and a second flow region of the secondary fluid conduit and that: physically distorts relative to a pressure differential between the primary fluid conduit and the secondary fluid conduit; and produces a shift in a Bragg wavelength in response to a physical distortion due to the pressure differential.

A turbulator adapted to be mounted to or inserted in an inlet portion of a flow meter for a ventilator is disclosed. The turbulator is adapted to create a turbulent gas flow in the inlet portion downstream of the turbulator upon passage of a gas flow therethrough. A flow meter for a ventilator is provided. The flow meter may comprise such turbulator. The turbulator may be arranged in the inlet portion of the flow meter. A membrane for a ventilator flow meter is provided, as well as a flow meter comprising the membrane. A flow meter comprising a turbulator and a membrane is disclosed.