Abstract
The high-frequency dynamic piezoelectric pressure sensor has the advantages of simple structure, long service life, high natural frequency, excellent signal-to-noise ratio and great sensitivity. It is appropriate for measuring high dynamic, dynamic or quasi-static pressure changes and pressure fluctuations. And this kind of sensor is widely utilized in the shock wave testing. The force-sensitive element is one of the main factors affecting the static and dynamic performance of piezoelectric pressure sensors. Basing on the piezoelectric equation and coupling effect between mechanics and electricity, in this paper, the finite element model of the high-frequency dynamic piezoelectric pressure sensor is established. The influences of the force-sensing element on the sensitivity of the sensor are analysed. Referential suggestions for choosing force-sensitive element of high-frequency dynamic piezoelectric pressure sensor are provided.
Highlights
In occasions such as shock wave measurement and aerodynamic tests, pressure is a kind of transient signal changing swiftly
Noise interferences are introduced by mechanical vibration or other factors, which requires the pressure sensor selected to have a wide range of response frequency and high natural frequency
High-frequency dynamic piezoelectric pressure sensor has the advantages of high natural frequency, excellent signal-to-noise ratio and great sensitivity
Summary
In occasions such as shock wave measurement and aerodynamic tests, pressure is a kind of transient signal changing swiftly. High-frequency dynamic piezoelectric pressure sensor has the advantages of high natural frequency, excellent signal-to-noise ratio and great sensitivity. It is appropriate for measuring the signals and is widely employed in occasions such as explosion, internal combustion engine system and aerospace [1]. The piezoelectric materials widely used include piezoelectric quartz, ceramics and film. Y.J. Li [3,4] employed PZT-5 as the force-sensitive element to manufacture a piezoelectric pressure sensor with high sensitivity, good dynamic characteristic and acceleration compensation module. How to choose appropriate one is a key technical problem that needs to be solved urgently in the process of designing and manufacturing high-frequency dynamic piezoelectric pressure sensors
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