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Applied Spectroscopy

Applied Spectroscopy

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  • Vol. 58, Iss. 3 — Mar. 1, 2004
  • pp: 344–348

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

Sebastián A. Thompson, Francisco J. Andrade, and Fernando A. Iñón

Applied Spectroscopy, Vol. 58, Issue 3, pp. 344-348 (2004)


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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.

Citation
Sebastián A. Thompson, Francisco J. Andrade, and Fernando A. Iñón, "Light Emission Diode Water Thermometer: A Low-Cost and Noninvasive Strategy for Monitoring Temperature in Aqueous Solutions," Appl. Spectrosc. 58, 344-348 (2004)
http://www.opticsinfobase.org/as/abstract.cfm?URI=as-58-3-344


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