Abstract
In this paper we describe a machine vision system for automatic optical quality inspection of light emitting diodes (LEDs). The proposed system is capable of measuring the intensity, mean colour, colour variation, divergence of the optical axis from the mechanical one and viewing angle of the emitted light. These optical properties are obtained by analysing the image of the light projected on a screen. A detailed analysis of the repeatability and thermal stability of the system was performed. The obtained results show that the proposed system is a powerful tool for automatic sorting of LEDs as it is capable of measuring the above-mentioned optical properties with high repeatability.
Published Version
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