A measurement system for determining a physical parameter of a pipe-fluid system includes a pair of confining elements configured to decrease surface vibration deformations at an outer surface of each end of the pipe-fluid system; wherein each confining element comprise a supporting frame configured to be detachably mounted on a pipe of the pipe-fluid system; and a fixation element configured to be detachably mounted for mechanically coupling the supporting frame with an outer surface of the pipe; an excitation system, configured to generate a mechanical vibration spectrum at a surface of the pipe-fluid system; and a vibration measurement device configured to be mechanically coupled to an outer surface of the pipe-fluid system, and configured to provide a mechanical vibration spectrum of the pipe-fluid system.