Flow Velocity and Pressure Measurement Using a Vibrating Cantilever Device

Measurement apparatus having a cantilever and a fluid flow channel, the cantilever being mounted at an opening of the fluid flow channel such that it projects in a direction parallel to the direction of fluid flow.

A method for determining the spring constant of a cantilever comprising positioning the cantilever in a fluid flow channel such that the cantilever extends parallel with the direction of fluid flow in the channel, causing fluid to flow in the channel, measuring the resonant frequency of the cantilever at one or more velocities of fluid flow and calculating the spring constant of the cantilever using the measured resonant frequency.

A method for determining the velocity of flow of a fluid or fluid flow rate comprising positioning a cantilever in a fluid flow channel so that the cantilever extends parallel with the direction of fluid flow, measuring the resonant frequency of the cantilever and using the measured resonant frequency to determine the velocity of flow of the fluid.

A holder adapted to receive an atomic force microscope cantilever chip such that the cantilever chip and/or the holder define a channel for fluid flow and wherein the cantilever is mounted at an opening of the fluid flow channel, the cantilever being in communication with and extending parallel to, the channel.