ADAPTIVE MECHANICAL FILTER FOR PIEZOELECTRIC ACCELEROMETER

When conducting dynamic tests, when simulating shock effects, the measurement system - from sensor to data acquisition unit is subject significant overloads. In this circuit, accelerometer most vulnerable link. Therefore, piezoelectric accelerometers have become widely used in measuring shocks as more reliable and durable, but they also a number of disadvantages. Thus, under broadband vibration excitation region mechanical resonance observed. That is, material crystal may not an excessive load, generate large amount output charge due sensor. This increases electrical signal can lead saturation or, many cases, damage shapers amplifiers following The result such modes operation loss displacement direct current over time. There often shift zero level signal. elements are resonance, there be relative sensing element. state overload leads appearance parasitic charges, which change generated short period Due overload, action high-intensity shocks, physical destruction possible. use filters made viscoelastic materials, placed between object (sensor), prevents undesirable consequences these shortcomings improves process shocks. materials makes it possible significantly reduce amplitude oscillations (over -12 dB) its resonant frequency towards higher frequencies. reduces load on sensor, (especially shock) predictable.