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Light Emission Diode Water Thermometer: A Low-Cost and Noninvasive Strategy for Monitoring Temperature in Aqueous Solutions

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Abstract:

A spectroscopic device for monitoring the temperature of aqueous solutions is presented. It uses a 950 nm light emission diode as light source and two photodiodes as detectors. Temperature is monitored following the thermally induced absorbance changes of the water-OH second overtone (~960 nm). A linear response between the light absorbed by an aqueous solution and its temperature is found in the range from 15 to 95 °C. A prediction error of 0.1 °C and a precision of 0.07 °C in temperature measurement can be achieved. Up to 0.1 M of electrolyte concentration can be present in the solution without significantly affecting the temperature measurement. Different strategies, such as remote (noninvasive) or in situ (using a fiber-optic probe) temperature measurement, are shown, and their relative advantages are discussed.

Keywords: NIR WATER ABSORPTION; NONINVASIVE TEMPERATURE MEASUREMENT; SPECTROSCOPIC TEMPERATURE MONITORING

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370204322886717

Affiliations: Laboratorio de Análisis de Trazas, INQUIMAE-Departamento de Qúımica Inorgánica, Anal´ıtica y Qu´ımica F´ısica-Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires. 3er Piso, Pabello´n 2, Ciudad Universitaria. (C1428EHA) Buenos Aires, Argentina

Publication date: March 1, 2004

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