Abstract
This paper studies the design of a PC-based multi-RGB color sensor system which measures the chromaticity coordinates and color temperature of LED light bulb using the RGB color sensor, optical diffuser and color temperature measurement program. This system has RGB color sensors that closely match the color-matching functions defined by the International Commission on Illumination (CIE) and the results can be displayed in person computer by RS232. The RGB color sensor generates the small electrical signal after it is hit by the light. The OP amplifier is used to this small electrical signal. Before the signal enters microprocessor, the analog signals converted into the digital signal by the A/D converter. The RS232 provides a simple and easy way to connect person computer for real-time monitoring the quality of products. The Correlated colour temperature (CCT) is an important parameter of light sources. It is estimated from the position of the chromatic coordinates (x, y) in the Commission Internationale de l'Eclairage (CIE) 1960 colour space. The spectral calibration factor enables the compensation of measurement values to match a desired standard by the correcting analog output of RGB color sensor. While the distance between the LED light bulb and RGB color sensor is 30 cm, and the beam angles of LED light bulb are from -45° to +45°, the accuracy of color temperature measurement is better than ±5%. The advantages of this system are real-time, compact, low-cost and multi-RGB color sensor.
Published Version
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