10 January 2005 Effects of temperature on near-infrared spectroscopic measurement of water
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Abstract
Near-infrared spectroscopy is a fairly powerful recent but well-established tool that can be used to study and measure biological and chemical concentrations, and the water is an important portion of organism and chemical reagent. Near-infrared (NIR) spectroscopic studies of water have long been a subject of keen interest from various points-of-view. The importance of the NIR spectrum of water stems from the fact that the frequencies and intensities of bands due to water alter with changes in the strength of hydrogen bonds and hydration. The NIR absorbance spectroscopy of water and the single-beam of the water were measured over a temperature range of 10-80°C at increments of 5°C and a spectroscopic range of 1-2.5μm. It had been validated that positions of water absorption bands centered at 6900cm-1 depend heavily on temperature effects. Temperatures can also influence the bands of the water molecules combinations and overtones. The trend of water absorbance spectroscopy's changing is discussed detailed in this paper. Especially the variety of the band amplitude and the shift tendency in peak position are all presented in this paper. At the same time, the spectroscopies that are collected with different parameter setup of the spectrograph during the temperature change are obtained. Partial least squares (PLS) calibration models were constructed at sixteen separate temperatures.
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Dong Ding, Dong Ding, Hongyu Luo, Hongyu Luo, Hongyan Zhang, Hongyan Zhang, Yuguo Tang, Yuguo Tang, Xuanguo Shen, Xuanguo Shen, } "Effects of temperature on near-infrared spectroscopic measurement of water", Proc. SPIE 5640, Infrared Components and Their Applications, (10 January 2005); doi: 10.1117/12.572363; https://doi.org/10.1117/12.572363
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