| 摘要 |
Mass flow rate is measured utilising a pair of parallel conduits (36, 37) having fixed ends (34, 35, 42, 43). A driving mechanism (48) is connected between the conduits (36, 37) near their mid-point for applying transverse oscillations to the conduits at a selected frequency. The fluid whose mass flow rate is to be measured is divided approximately equally by a Y-shaped passage (38) in a support (32) and is supplied through the parallel conduits (36,37). A motion sensor (56) upstream of the driving mechanism (48) and another one (58) downstream of the driving mechanism produce signals which have the same frequency as the driving frequency but which lead or lag the driving frequency with regard to phase. This difference in phase is a measurement of mass flow rate and is measured by a phase measuring device (80). |
