Evaluation of LED light sources through the reconstruction of their electromagnetic spectrum using an SoC and an 8-channel sensor
DOI:
https://doi.org/10.26871/killkanatecnica.v7i1.1466Keywords:
CCT, Electromagnetic Spectrum, Colorimeter, LED, InterpolationAbstract
The present work presents the implementation of a colorimeter from the 8-channel AS7341 sensor in conjunction with the ESP32 board. With the reading of the eight channels, Hermite's cubic interpolation, cubic segmental interpolation, and Akima interpolation are used to reconstruct the electromagnetic spectrum in a range of 360nm to 830nm with steps of 1nm, for LED sources with correlated color temperature (TCC) declared by the factory of 2700K, 3000K, 4000K, and 5000K. The UPRTEK portable colorimeter is used to compare the results between the measured electromagnetic spectra and those interpolated with each described technique. From the interpolated spectra, the calculation of chromatic coordinates x, y, u, v is performed, and then is obtained the TCC. The results show that the TCC obtained by the different interpolation techniques are within the allowed ranges for 2700K, while for 3000K only two techniques are within the ranges. In the other temperatures, all the techniques are outside the ranges.
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