Optical fibre measuring instrument: PCB development / Badrulhisam Md. Shah

The aim of this project is to develop a printed circuit board (PCB), for an optical fibre measuring instrument that can be used in conjunction with an optical fibre sensor. The instrument employed optoelectronics devices such as light emitting diode as a light source and semiconductor photodiode as a photodetector. A fibre optie cable is used as a media of transmission between light source, sensors and photodetector. A photodetector converts the light signals to an electrical signals. A circuit is designed on a copper embedded board to measure and manipulate the signals from the sensor to an equivalent amount of voltages .This instrument has been designed to detect colour vanations and micrometer displacements. The measuring instrument has extemal power supplies that are OV, +5V, + 12V, -12V and GND. The OV lines are tied to the GND line. The electronics circuitry deveiopment and modifications is based on the printed circuit board of previous works carried out in the same laboratory. The final outputs from this instrument are in the form of voltage levels representing the color variation or micrometer displacement detected through the same fibre optie sensor