Development Of Fibre Optic Roughness Measuring System Using Time Of Flight Method (TOF)

Ramaneshwaran, Baskaran (2011) Development Of Fibre Optic Roughness Measuring System Using Time Of Flight Method (TOF). Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This project is mainly about the development of Fibre Optics Roughness Measuring System using Time of Flight Method. This project is implemented by construction of hardware design and software programming. The components that involves in the construction of the circuit are PIC24FJ128GA006 microcontroller,optical switch, circulator, laser diode, pin detector and transimpedance amplifier. The heart of the surface roughness measuring system is the PIC24, 16-bit microcontroller whereby it works in a very high speed in order to capture the transmitted and received signal in light medium. The analog signal will be transmitted by the optical switch in to the microcontroller and it will be changed to digital signal before transmission. It will goes through the laser diode and detected by the pin detector. The digital signal is converted back to the analog signal by using the ADC read in the microcontroller before sending the signal to transimpedance amplifier. The output of the signal is observed by using oscilloscope and the signal is tapped at pin 6 of the transimpedance amplifier. Finally the time difference and the voltage difference is recorded when the laser is used to measure the surface roughness. The ALTIUM DXP software is used in order to design the circuit and for the programming part the MPLAB IDE is used in order to generate the C programming.The C programming code is embedded to the PIC24 by using PICKIT 2. The medium that have been used throughout the project is Fibre Optics and the wavelength is a non visible wavelength which is 1550nm. The main advantage of this project is the usage of the single mode fibre transmission. The advantage of this transmission is, it can measure for a long distance and it minimizes the loss along the signal transmission and this helps in producing a reliable signal when a surface roughness is measured.

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