 |
 |
 |
 |
 |
 |
 |
 |
Dynamic pressure transducers based upon piezo-cermics allow deflection of acoustic type phenomena, turbulence, cavitation, associated with fluid flow and are produced in two basic packages.
For applications involving significant background vibration, accelerometer compensation may be included.
The high sensitivity and linearity of these devices allow detection of accoustic levels as low as 70dBA superimposed upon pressure fields up to 500bar.
Piezo-electric sensor signals need be further processed, primarily because signals levels are inadequate for monitoring and control purposes without amplification, and will most probably contain additional data and noise from which the measurement of interest must be recovered.
One problem that was early addressed resulted in the introduction of the charge amplifier in 1957*. This breakthrough substituted an operational amplifier summing junction interface for the voltage follower hitherto used thus eliminating the signal attenuating effect of the sensor connecting lead which forms a voltage divider in conjunction with the source capacitance of the sensor.
 |