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A method and system for determining change in a fluid's flow rate within a line. The pressure variation in a second fluid, separated from the first by a pumping membrane, is measured in response to energy applied in a time-varying manner to the second fluid. From the response of the second fluid to

A method and system for determining change in a fluid's flow rate within a line. The pressure variation in a second fluid, separated from the first by a pumping membrane, is measured in response to energy applied in a time-varying manner to the second fluid. From the response of the second fluid to the applied energy, changes in the flow rate of the first fluid are determined.

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1. A method for determining a change in a first fluid's flow rate within a line, the method comprising:applying a time varying amount of energy to a second fluid separated from the first fluid by a membrane; measuring a pressure of the second fluid in response to the applied energy; and determining

1. A method for determining a change in a first fluid's flow rate within a line, the method comprising:applying a time varying amount of energy to a second fluid separated from the first fluid by a membrane; measuring a pressure of the second fluid in response to the applied energy; and determining a change in the first fluid's flow rate based at least on the pressure of the second fluid.