Piezoelectric Sensing Application Focused On Accelerometer Design

Kok, Swee Leong (2013) Piezoelectric Sensing Application Focused On Accelerometer Design. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Accelerometer is an electronic device used to measure the activity of vibration and shock which present in all areas of our daily lives. They may be generated and transmitted by motors, turbines, machine-tools etc. In this project, a low cost accelerometer device is developed for the use of measuring vibration level from vibration sources such as motor engine, machineries with a simple set-up using piezoelectric cantilever. The accelerometer is developed using easily available piezoelectric materials with physical area about a few cm2 (3cm x 5cm) which can easily mounted in the form of a cantilever. The piezoelectric cantilever was obtained off-the-shelf and tailor made to suit to the application as an accelerometer. The accelerometer was designed to operate at frequency higher than its resonant frequency so that a linear response would be produced. At this said frequency, the voltage output is proportional to the magnitude of the acceleration level (g-level), therefore the level of the vibration from any sources with excitation frequency higher than the piezoelectric cantilever structure natural frequency can be measured. However, at frequency range outside from resonant, the voltage output produced by the piezoelectric accelerometer is small and very difficult to measure accurately due to measurement noise. Therefore, amplifier circuit was developed to amplifier the small signal from the accelerometer before being measured and analyzed.

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