Design and implementation of an automated measuring system for a goniophotometer

Vivas Imparato, Abdón Alejandro (2017). Design and implementation of an automated measuring system for a goniophotometer. Thesis (Master thesis), E.T.S.I. Telecomunicación (UPM).

Description

Title: Design and implementation of an automated measuring system for a goniophotometer
Author/s:
  • Vivas Imparato, Abdón Alejandro
Contributor/s:
  • Egido Aguilera, Miguel Ángel
Item Type: Thesis (Master thesis)
Masters title: Ingeniería de Telecomunicación
Date: 2017
Subjects:
Freetext Keywords: Instrumentation, Automation, Goniophotometer, Photometry, Illuminance, Luminous Intensity, Luminous Flux, FWHM, Arduino, Java, MATLAB.
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Otro
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The IES (Instituto de Energía Solar, spanish for Institute of Solar Energy) of the Universidad Politécnica de Madrid (Technical University of Madrid) decided to build a goniophotometer, which is an instrument to measure the angular dependence of a photometric quantity. Although the purpose of this decision is local quality testing, it is planned to be replicated in countries where the IES has rural electrification projects. The aim of this project is to design the automated measuring system for that goniophotometer. As it is intended to implement this design in different geographical locations, it must be as replicable as possible, i.e., the lesser the dependence on a specific component, the better. In consequence, an architecture was designed instead of a particular automated measuring system. This way, by using similar components, it can be implemented anywhere in the world. However, as a proof of concepts (and to be used at the IES), this project also involves an implementation of that architecture. Concerning the IES goniophotometer, it is a fixed-sensor, moving-light source, type C goniophotometer: Two motors rotate the light source in the polar and azimuth axes while a sample of the illuminance fallen on a sensor is taken in all directions. Afterwards those samples are converted into luminous intensities using the inverse square law, and the total luminous flux is calculated from them. The resultant architecture of the automated measuring system was named after its only non-generic and core element: KNDL. It is a freely distributed Java program developed during this project. Its purpose is to collect, sort, process, and store the measured data. These data are received from a control device (i.e. a microcontroller) which orchestrates the rest of the elements: two reference subsystems, two stepper motors (and their respective motor drivers), and a sensing subsystem. For the implementation an Arduino Board was used as a control device, an optocoupler and a metallic disk with a notch for each reference subsystem, two H-bridge motor drivers, two bipolar stepper motors, and two types of sensing subsystems: A separated lux meter and an analog-to-digital converter, and an integrated circuit. Finally, a few light sources were measured in order to generate results. Two set of tests were performed: One to compare plots of the resulting luminous intensity distribution with the shape of the light sources, and another to compare the resulting total luminous flux of the light sources with that of another system (more specifically, an integrating sphere).

More information

Item ID: 53029
DC Identifier: http://oa.upm.es/53029/
OAI Identifier: oai:oa.upm.es:53029
Deposited by: Biblioteca ETSI Telecomunicación
Deposited on: 15 Nov 2018 14:24
Last Modified: 15 Nov 2018 14:24
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