Lifetime Based Surface Temperature Measurement in an Optical Engine Using a High-Speed Camera(Fluids Engineering)

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  • SOMEYA Satoshi
    Energy Technology Research Institutes of AIST:Graduate School of Frontier Science, The University of Tokyo
  • UCHIDA Mitsunori
    Graduate School of Frontier Science, The University of Tokyo
  • OKURA Yasuhiro
    (株)本田技術研究所四輪R&Dセンター
  • LI Yanrong
    Graduate School of Frontier Science, The University of Tokyo
  • OKAMOTO Koji
    Graduate School of Frontier Science, The University of Tokyo

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Other Title
  • 高速度カメラを用いた燐光寿命法による可視化エンジン内壁面温度分布計測(流体工学,流体機械)
  • 高速度カメラを用いた燐光寿命法による可視化エンジン内壁面温度分布計測
  • コウソクド カメラ オ モチイタ リンコウ ジュミョウホウ ニ ヨル カシカ エンジン ナイヘキメン オンド ブンプ ケイソク

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Abstract

The surface temperature inside an optical engine both with and without heating the intake gas was measured. The temperature distribution was measured by a lifetime based phosphor thermometry using only three or 10 images recorded using a non-intensified high-speed CMOS camera by accounting for the pixel-to-pixel variation in the nonlinearity of the sensor. The luminescence from the phosphor was recorded at 40000 frames per second. A decay of luminescent intensity was represented by a mono-exponential function. The decay curves at various temperature conditions were fitted well to a quadric function, from which the decay constant at each temperature was obtained. The shot-to-shot standard deviation of the decay constant at uniform temperature conditions was 0.17〜0.33% and it varied ±0.15% with position, indicating that the pixel nonlinearity has a high nonuniformity. This technique was used to measure the temperature in an optical engine and it gave reasonable temperature maps.

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