Abstract
This work analyzes the long-term functionality of HP (High-power) UV-LEDs (Ultraviolet Light Emitting Diodes) as the exciting light source in non-contact, continuous 24/7 real-time fluoro-sensing pollutant identification in inland water. Fluorescence is an effective alternative in the detection and identification of hydrocarbons. The HP UV-LEDs are more advantageous than classical light sources (xenon and mercury lamps) and helps in the development of a low cost, non-contact, and compact system for continuous real-time fieldwork. This work analyzes the wavelength, output optical power, and the effects of viscosity, temperature of the water pollutants, and the functional consistency for long-term HP UV-LED working operation. To accomplish the latter, an analysis of the influence of two types 365 nm HP UV-LEDs degradation under two continuous real-system working mode conditions was done, by temperature Accelerated Life Tests (ALTs). These tests estimate the mean life under continuous working conditions of 6200 h and for cycled working conditions (30 s ON & 30 s OFF) of 66,000 h, over 7 years of 24/7 operating life of hydrocarbon pollution monitoring. In addition, the durability in the face of the internal and external parameter system variations is evaluated.
Highlights
Water is one of the most important resources necessary for sustaining life on earth
The conventional methods used in recognizing a hydrocarbon pollutant involves transporting a sample from the area of water pollution and identifying the pollutant in the laboratory, most often using the fluorescence spectroscopic method [13,14].While this is an accurate method, it involves too much time for a rapid, and in some cases, programmable automatic action, to mitigate the pollution effect
To corroborate the results presented, some fluorescence measurements taken using UV-LED as the light source, the recorded under the samesome conditions at different temperatures,taken clearlyusing highlight the as
Summary
Water is one of the most important resources necessary for sustaining life on earth. Population growth and the consequent creation of infrastructures, sewage treatment plants, crops, industries, intensive agriculture, etc., and the associated traffic generated implies a relevant/critical hazard for inland water. In the case of inland water pollution by hydrocarbons and other pollutants which emit fluorescence under high energy light, new developments and analyses are being conducted [1,2,3,4,5,6,7,8,9,10,11,12]. The conventional methods used in recognizing a hydrocarbon pollutant involves transporting a sample from the area of water pollution and identifying the pollutant in the laboratory, most often using the fluorescence spectroscopic method [13,14].While this is an accurate method, it involves too much time for a rapid, and in some cases, programmable automatic action, to mitigate the pollution effect.
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