Applications of Light Emitting Diode and Photodiode for DOBI Measurement of Crude Palm Oil
Keywords:
DOBI, Crude palm oil, Light Emitting DiodeAbstract
The Deterioration of Bleachability Index or DOBI is used to determine the quality of crude palm oil. In analyzing DOBI values, large palm oil factories use UV-Vis Spectrophotometer. The UV-Vis spectrophotometer uses a gas light source and light detector array with a sophisticated monochromator, which is expensive and must be imported from abroad. In this research DOBI meter was developed using light emitting diode and photodiode to determine DOBI values of crude palm oil. The results showed that the DOBI meter can accurately measure DOBI values. When compared with the measured values with the UV-Vis Spectrophotometer, there was only 2% difference. The DOBI meter uses two light emitting diodes and two photodiodes. Light-emitting diodes have a spectrum that peak at 269 nm and 446 nm with a full width at half maximum (FWHM) of approximately 51 and 52 nm, respectively, while photodiodes begin to respond at light intensity of approximately 500 counts. The DOBI meter is compact, simple and inexpensive that has the potential for further commercial development.
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