Abstract
Uncontrolled dumping linked to agricultural vehicles causes an increase in the incorporation of oils into the irrigation system. In this paper, we propose a system based on an optical sensor to monitor oil concentration in the irrigation ditches. Our prototype is based on the absorption and dispersion of light. As a light source, we use Light Emitting Diodes (LEDs) with different colours (white, yellow, blue, green, and red) and a photodetector as a sensing element. To test the sensor’s performance, we incorporate industrial oils used by a diesel or gasoline engine, with a concentration from 0 to 0.20 mLoil/cm2. The experiment was carried out at different water column heights, 0 to 20 cm. According to our results, the sensor can differentiate between the presence or absence of diesel engine oil with any LED. For gasoline engine oil, the sensor quantifies its concentration using the red light source; concentrations greater than 0.1 mLoil/cm2 cannot be distinguished. The data gathered using the red LED has an average absolute error of 0.003 mLoil/cm2 (relative error of 15.8%) for the worst case, 15 cm. Finally, the blue LED generates different signals in the photodetector according to the type of oil. We developed an algorithm that combines (i) the white LED, to monitor the presence of oil; (ii) the blue LED, to identify if the oil comes from a gasoline or diesel engine; and (iii) the red LED, to monitor the concentration of oil used by a gasoline engine.
Highlights
That presents an in the red light, we discard the height of 5 cm of the water column due to its high dispersion optimal behaviour to determine the concentration of oil used by a gasoline engine
We evaluated the application of an optical sensor to measure industrial oil concentration in irrigation water
The blue Light Emitting Diodes (LEDs) can determine the source of this industrial oil
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The industry is another source of pollution; some industries can incorporate used oil into the water by illegal dumping These discharges often end up in different water bodies such as channels or ditches, whose water can be used for irrigation purposes. We propose a reflection-absorption sensor for monitoring the amount of industrial oil (used by a gasoline or diesel engine) present in water used for irrigation For this purpose, we use industrial oil coming from gasoline and diesel engines as a pollution source. The operation of the LDR is based on the fact that the resistance decreases when exposure to light increases These changes in its resistance will be measured when the sensor is exposed to different levels of pollution.
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