Acoustic Wave Signal Analysis Using Piezoelectric Coupling Device For Disc Counting Application

Peggy, Tan Peck Gee (2016) Acoustic Wave Signal Analysis Using Piezoelectric Coupling Device For Disc Counting Application. Project Report. UTeM, Melaka, Malaysia. (Submitted)

Text Acoustic Wave Signal Analysis Using Piezoelectric Coupling Device For Disc Counting Application 24 Pages.pdf - Submitted Version Download (335kB)

Abstract

Part counting system is an essential system for packaging process in every industry. However, manual counting is not an efficient and precise way. Therefore, a new method is necessary to differentiate the quantity of disc by using the concept of changes of resonance frequency with the number of disc count. In this project, piezoelectric coupling device is used as actuator and sensor to measure the quantity of disc. Due to, the weak propagation of acoustic wave between disc, the piezoelectric sensor will pick up very low AC signal and contains noises. Therefore, the signals generated by piezoelectric sensor needs to be investigated and characterized first before designing the filter circuit and amplifier circuit in order to filter noises and amplify the signals to a level which can be measured by oscilloscope. Once the signals are conditioned, the resonance frequency of the discs at different frequency range is identified which representing the information of number of discs. For the experiment, piezoelectric coupling device is placed in parallel and sandwiching the discs in between. One of the piezoelectric plate is operating as a transducer which vibrate and generates acoustic wave signal. If there is any material in contact with acoustic wave, the added mass will cause the vibration frequency changes. At the opposite side, another piezoelectric is operating as a sensor to pick up the vibration signal to detect the pattern of changes of vibration frequencies in correlation with number of count for the disc. The signal is being measured with oscilloscope in the form of waveform patterns. The waveform is then being analyzed to determine the relationship between the quantity of the object and resonance frequency. Repeated experiment is done to verify the results. From the experiment results, it has shown that the more the quantity of disc, the higher the resonance frequency in the range from 8 kHz to 12 kHz.

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