UV LEDs reliability tests for fluoro-sensing sensor application

Functional Analysis in Long-Term Operation of High Power UV-LEDs in Continuous Fluoro-Sensing Systems for Hydrocarbon Pollution

“…The process involved in obtaining these results has been extended over time: the authors studied the HP UV-LEDs with respect to the hydrocarbons comparing them with other classical light sources in [ 20 ], and later developed a series of experiments with two types of new commercial technologies 3W 365 nm HP UV-LEDs, characterizing the encapsulating, thermal, and electrical response in two working modes: continuous and cycled (30 s ON & 30 s OFF) [ 25 ], indicating the method and the preliminary results of the ALT [ 24 , 25 ] with these two types of UV-LEDs and the two working conditions in [ 24 ].…”

“…Fluorescence detection systems based on compact CCD spectrometer are emerging as a tool in research field applications [ 2 , 3 , 4 , 20 ]. In this work two compact spectrometers (Avantes ® Ava-Spec 2048-USB2-UA, and Mightex ® HRS-BD1-025) have been used, the first one for workbench instrumentation in signature readout, and the second one for analysis of UV-LED temperature ALT [ 24 , 25 ]. The spectra readout is obtained via a specific optical fiber of 0.6 mm Ø, solid angle Ω = 0.15 sr, numerical aperture NA = 0.22 ( Figure 2 a).…”

“…The temperature ALT instrumentation is explained in [ 24 ] where the instrumentation and preliminary results of ALT are described. The HP UV-LEDs used their characteristics, and electrical and optical operational working conditions are exhaustively described in [ 25 ].…”

“…The future short-term objectives are recognition of the signature pattern and integration of the whole experimental system in automatic water quality station of the Jarama-Tagus Rivers (Spain) [ 22 , 23 ], working 24/7 ( Figure 1 ). In these automatic stations, the authors test different disciplines related to the development of new capabilities, such as the present work, which analyzes the HP UV-LED in the long-term, non-contact, continuous, real-time fluoro-sensing identification of the pollutants [ 20 , 24 , 25 ], as well as others, like the development of compact, low-power consumption high security warning communications systems with redundant dual-band based mobile phone systems (380 MHz and 960 MHz) [ 26 , 27 ].…”

Validación de HP UV-LED para la detección en continuo de contaminantes en aguas continentales mediante fluorescencia

“… Se han realizado tres ensayos acelerados en temperatura sobre dos tipos de HP UV LEDs y dos modos de trabajo, dada la novedad del dispositivo y de la aplicación planteada, los resultados preliminares de estos ensayos fueron publicados en [ANVG14]. En la tesis se completan los resultados con las gráficas de degradación en cada ensayo y tipo de trabajo, la caracterización de la degradación que sufre cada tipo de LEd y como ha ocurrido dicho proceso, y por último la identificación de la energía de activación y esperanza de vida de cada Según la evolución de las curvas se propone tomar dos parámetros que representen resultados diferenciados, para así poder obtener alguna conclusión.…”