Hydrodynamic Pressure Transducer

Hydrodynamic pressure fluctuations very commonly occur in hydraulic models. The measurement of these pressure variations are very important for the proper designing of the hydraulic structures. When the fluctuation frequencies are high, pressure observations with manometers and gauges are not possible. Pressure cells with ordinary metallic diaphragms are also not sensitive to low head pressure variations. An electrodynamics pressure cell has been devised for recording high frequency pressure fluctuations of heads from 1 cm to 10 cm. A sensitive reinforced phenolic diaphragm has been used as the sensing element in the pressure transducer. The diaphragm being delicate, pressure variations have been transmitted to it through a separate liquid chamber. The response of the transducer has been made linear by incorporating an integrating circuit in the electronic amplifier. The transducer is sensitive upto frequencies 100 cycles/sec.