GONIOPHOTOMETRIC MEASUREMENTS

YFU, can make goniophotometric measurements in its photometry laboratory, according to the international standards with the third self developed and manufactured goniophotometer. YFU has started goniophotometric measurements with a self designed mechanical instrument in 1988. Later YFU developed its goniophotometer design to obtain a third one in 1998, which has two motorized axes and fully computer controlled. Once a luminaire is mounted on it, and the necessary adjustments are made and the necessary data is given, the measurement is automatically carried out from beginning to the end. The computer software for the goniophotometer is also self-programmed and has many facilities.

Technical characteristics of this new goniophotometer is given below :

Computer controlled rotation in both axis
0.05 degrees accuracy in horizontal movement
0.1 degrees accuracy for plane movement
In both axis, the angular movement is controlled with encoders and fed back to make sure that the correct angle is reached
Special programmed software, which enables measurements according to standards, with flexible adjustment parameters
Possibility to measure down to 0.001 lux thanks to special design to prevent scattered light
Automatic determination of measurement angle limits by the software to provide quick measurement
Luminaires having the longest dimension up to 160 cm can be measured

With this goniophotometer named as GONFU-302 by YFU, it is possible to measure distribution of luminous intensity and to obtain graphical and table printouts. If asked, tables can be given as Excel files and/or in Eulumdat format in electronic media. Using this data it is possible to make illumination calculations and also to prepare plug-in data for computer programs like DIAL.

The report prepared by YFU for these measurements include the following information :

Graphical expression of distribution of luminous intensity in polar coordinates
Graphical expression of distribution of luminous intensity in Cartesian coordinates
Numerical value of half-peak-angle and its graphical expression in both polar and Cartesian coordinates
Numerical value of 1/10 angle
Numerical value of maximum light intensity of the luminaire and its direction (angle and plane)
Table for distribution of luminous intensity
Light output ratio of the luminaire (calculated from the measurement results)
Table to give the illumination level, minimum, mean and maximum illumination level, diameter and area of half-peak-angle at different elevations, as a function of distance from the center, for full-symmetric luminaires and graphic for illumination level.

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For comments please send an e-mail to Osman Sirel.