Patent ID: 7519483

Claim:
A system for the measurement, in real time, of the instantaneous flow of a fluid in steady or unsteady motion in a conduit, comprising: a flow-velocity measuring device placed in the conduit, where the said flow-velocity measuring device is equipped with two pressure take-offs in the wall, a pressure-difference measuring device designed to be connected to two pressure take-off, a calculation resource designed to calculate flow, in real time, by solving an equation that relates the instantaneous flow to the pressure difference, where the latter is positive or negative in the said equation depending on variations in the speed of fluid flow in the conduit and/or the direction of the fluid flow, wherein the calculation resource is an analogue or digital electronic calculator, and wherein the calculation resource includes a first amplifier connected to a first input of a subtractor, an integrator connected to an output of the subtractor, a feedback loop connected between an output of the integrator and a second input of the subtractor, where the feedback loop includes a module producing the absolute value function connected to the output of the integrator, and a multiplier which is connected by a first input to an output of the module and by a second input to the output of the integrator.