Instantaneous leakage flow rate measurement of compressed air

In this paper, an instantaneous method for measuring leakage flow rate in pipeline is enabled by employing standard flow. Measuring equipment can be parallel connected to the pipeline, which promise the convenience and non-destruction. Standard flow is used to determine the internal volume of the measured equipment. And a nonlinear discrete-time tracking-differentiator has been designed to track the differential pressure. An algorithm is formulated to describe, to the extent possible, the relationship between leakage and standard flow. To date, similar methods have not been reported by any other groups.