Performing Calibration of Transmittance by Single RGB-LED within the Visible Spectrum

• Published in: Sensors (Basel, Switzerland) Vol. 20; no. 12; p. 3492
• Main Authors: Carreres-Prieto, Daniel, García, Juan T., Cerdán-Cartagena, Fernando, Suardiaz-Muro, Juan
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 20.06.2020; MDPI
• Subjects: Accuracy; Calibration; cost effective; Energy consumption; Environmental protection; Gratings (spectra); Incandescent lamps; ISO standards; Lamps; Light emitting diodes; Optical components; Pollutants; Portable equipment; RGB-LED spectrophotometer; Sensors; Sewer systems; Spectrophotometry; Spectrum analysis; transmittance modelling; Visible spectrum; Wastewater; water pollutants; Water quality; Water treatment
• ISSN: 1424-8220; 1424-8220
• DOI: 10.3390/s20123492

Spectrophotometry has proven to be an effective non-invasive technique for the characterization of the pollution load of sewer systems, enabling compliance with new environmental protection regulations. This type of equipment has costs and an energy consumption which make it difficult to place it inside a sewer network for real-time and massive monitoring. These shortcomings are mainly due to the use of incandescent lamps to generate the working spectrum as they often require the use of optical elements, such as diffraction gratings, to work. The search for viable alternatives to incandescent lamps is key to the development of portable equipment that is cheaper and with a lower consumption that can be used in different points of the sewer network. This research work achieved the following results in terms of the measured samples: First, the development a calibration procedure that enables the use of RGB-LED technology as a viable alternative to incandescent lamps, within the range of 510 to 645 nm, with high accuracy. Secondly, demonstration of a simple method to model the transmittance value of a specific wavelength without the need for optical elements, achieving a cost-effective equipment. Thirdly, it provides a simple method to obtain the transmittance based on the combination of RGB colors. Finally its viability is demonstrated for the spectral analysis of wastewater.