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)

概要

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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.
2010-07-25