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# Piezoelectric Accelerometer - Assignment Example

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In the paper “Piezoelectric Accelerometer” the author focuses on piezoelectric materials, which are those which generate a charge when subjected to deformation or force. Transducers based on piezoelectric effect are known as piezoelectric transducers…

## Extract of sample "Piezoelectric Accelerometer"

Download file to see previous pages The factors affecting the range of frequencies: An ideal accelerometer should be perfectly linear. A good accelerometer should have a near-linear response; a real accelerometer shows approximately linear response over a range of frequencies only. Several factors decide this range of frequencies. The response is nearly linear only if the following holds good:
Now, if ζ lies in between 0.65 and 0.7, from (3), the left-hand side of (3) lies between 0.96 and 1.04 for 0 ≤ r ≤0.6. Since r is small, the natural frequency of the instrument has to be large compared to the frequency of vibration to be measured. Hence, the natural frequency is the most important factor which decides the range of frequencies over which a piezoelectric accelerator can operate.
As can be seen from (3), mass, damping and stiffness (stiffness comes into picture while calculating the natural frequency), and also the excitation frequency (i.e., frequency of vibration of the structure whose acceleration is to be measured) have their role in deciding the frequency range over which the measurement may reliably be made using the piezoelectric accelerometer.
Mass: Natural frequency increases when the thickness of seismic mass decreases [1]. The exact variation depends on the actual material composition of the seismic mass. Also, the total mass of the accelerometer should be small compared to the mass of the test structure.
Signal conditioning: This refers to amplifying the output from sensors, so that the amplified signal may be read by the display device. The type of final output required decides the type of signal conditioning to be employed.
Finally, the frequency range over which the accelerometer can reliably be used depends on each accelerometer, conditioner, and the display device. It also depends on the structure whose acceleration is to be measured and also how the accelerometer is mounted. ...Download file to see next pagesRead More
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“Piezoelectric Accelerometer Assignment Example | Topics and Well Written Essays - 1500 Words”. https://studentshare.org/engineering-and-construction/1749549-vibration-analysis.
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