Increasing the Sensitivity of Vibrating Wire Pressure Sensor

Abstract

The design of a sensitivity improved dual diaphragm based vibrating wire transducer for sensing pneumatic pressure is proposed. The improvement achieved in sensitivity of a dual diaphragm structure over the single diaphragm category is verified through experiments. An experimental setup for efficiently assessing the dynamic performances of the pressure transducers is presented. Eventually, the improved sensitivity concedes improvement in precision and resolution of the instrument. While the vibrating wire transducer based pressure sensors always show better dynamic performances over others, the present dual diaphragm structure offers improved sensitivity, which adds to their dynamic performances and overall performance characteristics.INDEX TERMS Diaphragm structure, dynamic pressure sensor, sensitivity improvement, time constant measurement.

A study on dynamic measurement methods based on vibrating wire sensors

“…The scale of f m is limited by equations ( 29) and (30), as well as by parameter of the selected vibrating wire sensor itself. For the Geokon Model 4050, the scale of the sensor's resonance frequency f m is 1400-3200 Hz [12]. Within the range of f m , the scale of f c for each value of N can be calculated from equation (31).…”

“…To measure the resonance frequency accurately, Cellatoglu et al used a basic fast Fourier transform (FFT) [12]. Santos et al used three-and four-parameter sine-fitting algorithms to estimate the frequency [13].…”