Abstract
This study investigates the influence of temperature on the spectral absorption characteristics of three heat transfer fluids; propylene glycol, mineral oil, and silicone oil. The region of interest of the liquid absorption spectra ranges from 700 to 2000 nm. The absorbance of propylene glycol was found to have a strong dependence on temperature. Mineral oil and silicone oil did not present significant temperature dependent absorbance. Absorbance peaks for water were found at 750, 985 1175, 1285 and 1680 nm. Propylene glycol also showed absorbance changes in these regions. In addition, propylene glycol displays two other regions of temperature-dependent absorbance. In contrast with silicone oil and mineral oil, the hydroxyl bond is only present in water and propylene glycol. It is thought that resonant absorption of the hydroxyl bond is responsible for the measured temperature-dependent absorption change.
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