Pressure transducer

摘要

A linear variable differential transformer pressure transducer includes a pressure sensing element which is deformed in response to changes in the pressure of a fluid. The pressure sensing element is connected to the core of a differential transformer, the coils of which are mounted on a dashpot within which the core is disposed. The dashpot is filled with a damping fluid which surrounds the core. The core enters the dashpot through an opening in a flexible boot which covers the open end of the dashpot to prevent leakage of the damping fluid. The pressure transducer serves to suppress destructive harmonic resonances of the Bourdon tube by imparting a variable restraining force on the linear movement of the core. The pressure transducer exerts a minimal restraining force to the low frequency movements of the core caused by normal fluctuations in the fluid pressure, but exerts a high restraining force against sudden pressure transients or vibration near the pressure sensing element's resonant frequency.