Design of goniophotometer with the automated measuring system

Abstract

This paper deals with the design of a goniophotometer which is a device used for measuring the light distribution of luminaire. Light distribution is measured in the way that luminaire changes its position, respectively angle towards to luxmeter which measures light intensity in defined angle. The proposed automated system is used for the control of two motors which are used for positioning the luminaire. The proposed system is used also for automated measuring of luminous intensity at defined angles which can be defined by the user. This can speed up measurement significantly because, if the luminaire is symmetrical so only half of the measurement samples are necessary. The next advantage of the proposed system is that all results of measurements are saved in EULUMDAT which except for values of luminous intensity contains parameters of luminaire and parameters of measurement. Files in this format can be processed directly in some special software for lighting design.