University of Khartoum

Design and Implementation of a Microcontroller Based System for Calibration Bench Control in a Secondary Standdard Dosimetry Lab (Ssdl)

Design and Implementation of a Microcontroller Based System for Calibration Bench Control in a Secondary Standdard Dosimetry Lab (Ssdl)

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Title: Design and Implementation of a Microcontroller Based System for Calibration Bench Control in a Secondary Standdard Dosimetry Lab (Ssdl)
Author: Ismael, Mjzoob Ismael Ibrahim
Abstract: The objective of this thesis work is to design a real time module of calibration bench for use in Secondary Standard Dosimetry Laboratory. The implemented module consists of a microcontroller as the heart of the system, two sensors (position sensor, temperature sensor), electronic circuits, and a mechanical system for the longitudinal and vertical motion. An 8051 microcontroller provides signals to control the system and achieves the position of the Bench which is detected by the inductive proximity sensor (M30, 8mm, Metal), other function of the microcontroller is to process the data which is handled the temperature sensor (Precision Centigrade LM35). The calibration Bench module utilizes closed loop feedback system via a proximity sensor which is located on one of the Bench wheels, for a precise movement and accurate bench position. By utilization of digital logic in the form of microcontroller feedback signal, DC motors are used for powering the mechanical system. They are controlled via two H-bridge power FET transistors arrays, which provide the driving power and direction control. While the microcontroller controls the H-bridge through the optisolator. The calibration bench system is designed, implemented, and then tested and the results show small difference in a desired position as compared to the manual adjustment. The accuracy of results is affected by the sensor resolution. The goal of the design is to increase the quality of the calibration process, decrease of exposure time for the personnel (occupational Dose Reduction).Thus good radiation protection introduced as the result of well calibrated instruments, so the implemented module maintains the main objectives of the proposed system and could be applicable for further applications
Description: 117 Pages
URI: http://khartoumspace.uofk.edu/handle/123456789/9983
Date: 2015-04-30


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