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Open AccessArticle

Spectroscopy Transmittance by LED Calibration

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Department of Mining and Civil Engineering, Technical University of Cartagena, 30202 Cartagena, Spain
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Department of Information and Communications Technologies, Technical University of Cartagena, 30202 Cartagena, Spain
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Department of Electronic Technology, Technical University of Cartagena, 30202 Cartagena, Spain
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Authors to whom correspondence should be addressed.
Sensors 2019, 19(13), 2951; https://doi.org/10.3390/s19132951
Received: 30 May 2019 / Revised: 25 June 2019 / Accepted: 2 July 2019 / Published: 4 July 2019
Local administrations demand real-time and continuous pollution monitoring in sewer networks. Spectroscopy is a non-destructive technique that can be used to continuously monitor quality in sewers. Covering a wide range of wavelengths can be useful for improving pollution characterization in wastewater. Cost-effective and in-sewer spectrophotometers would contribute to accomplishing discharge requirements. Nevertheless, most available spectrometers are based on incandescent lamps, which makes it unfeasible to place them in a sewerage network for real-time monitoring. This research work shows an innovative calibration procedure that allows (Light-Emitting Diode) LED technology to be used as a replacement for traditional incandescent lamps in the development of spectrophotometry equipment. This involves firstly obtaining transmittance values similar to those provided by incandescent lamps, without using any optical components. Secondly, this calibration process enables an increase in the range of wavelengths available (working range) through a better use of the LED’s spectral width, resulting in a significant reduction in the number of LEDs required. Thirdly, this method allows important reductions in costs, dimensions and consumptions to be achieved, making its implementation in a wide variety of environments possible. View Full-Text
Keywords: LED spectrophotometer; LEDs; water pollutants LED spectrophotometer; LEDs; water pollutants
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MDPI and ACS Style

Carreres-Prieto, D.; García, J.T.; Cerdán-Cartagena, F.; Suardiaz-Muro, J. Spectroscopy Transmittance by LED Calibration. Sensors 2019, 19, 2951.

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