Development Of Acoustic Sensor Micro Bending Measurement System For Flexible Printed Circuit Board

Lea, Hui Shan (2018) Development Of Acoustic Sensor Micro Bending Measurement System For Flexible Printed Circuit Board. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Nowadays, the flexible printed circuit (FPC) technology becomes wider used in the world and demands of the market increased. In the other hand, the disadvantages of the FPC is when the FPC is damage on the surface or route, the workers do not need to check it one by one by using the multimeter and other instruments. Due to this, this project is going to develop an acoustic sensor micro bending measurement system for the flexible printed circuit (FPC). In this project, two piezoelectric plates are used as actuator and sensor to measure the micro bending of FPC. Due to the weak propagation of acoustic wave across the FPC, the AC signal pick up by the sensor is very low and consists of noises. Therefore, a filter and amplifier circuit had been designed. Before designing the circuit, the signal generated by piezoelectric sensor need to be characterized which done with the spectrum analyzer. Once the signals are conditioned, the resonance frequency of the FPC at different bending angle is identified. For the experiment, the piezoelectric coupling device is placed at the surface of each end of FPC. One of the piezoelectric plates acts as a transducer and connected to the piezo amplifier which vibrates and generates an acoustic wave. If any changes on the path of the acoustic wave, the vibration frequency will be affected. The other side of piezoelectric plate acts as the sensor to pick up the vibration signal to detect the pattern of vibration frequency’s changes with the changing of bending angle of FPC. After that, the signal is being sent to the analog-digital converter (ADC) and observed by using Raspberry Pi. The Raspberry Pi based oscilloscope was being done by scripting will plot the data receive by ADC lively. At the end of the project, the maximum angle of the FPC is 45� and the range of resonance frequency is around 24 to 25 kHz.

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