Non-Invasive Measurements of Temperature Using Near Infrared Light

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  • Momoki Hideyuki
    Dept. of Mechanical Engineering and Intelligent Systems. Univ. of Electro-Communications
  • Arimoto Hidenobu
    National Institute of Advanced Industrial Science and Technology
  • Kakuta Naoto
    Dept. of Mechanical Engineering and Intelligent Systems. Univ. of Electro-Communications
  • Yamada Yukio
    Dept. of Mechanical Engineering and Intelligent Systems. Univ. of Electro-Communications National Institute of Advanced Industrial Science and Technology

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Other Title
  • 近赤外光を用いた無侵襲温度測定
  • キン セキガイコウ オ モチイタ ムシンシュウオンド ソクテイ

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Abstract

We have proposed a new method of measuring temperature of media containing water by near infrared spectroscopy and multivariate analysis. The peak wavelength of the water absorption band at about 1450 nm shifts with the change in temperature. By measuring the wavelength shift of the absorption band we can measure the temperature of media containing water whenever it is transparent like water solutions or turbid like biological tissues. Fundamental experiments have validated the proposed method. The measurement accuracy has been found to be less than 0.1 °C for pure water, 0.3 °C for turbid media with transmission measurement, and 0.6 °C for turbid media with reflection measurement.

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