熱流体計測システムにおけるデジタル動的補償システムの構築(成層,一般講演)

概要

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The digitalization of the thermo-anemometer with FPGA device was conducted to realize the precise measurement of temperature and velocity fields. Digital dynamic compensator was developed by integrating the phase compensator for the cold-wire thermometer and the temperature compensator for the hot-wire anemometer. The first-order lag due to the thermal time constant on the cold-wire sensor was compensated with the digital filter comprised the first-order lead characteristic designed by the bilinear transformation. It was verified that the temperature signals at the low frequency range were appropriately compensated with an uncertainty of less than 3.9%. The accuracy of velocity measurement at high temperatures was improved by incorporating the correction term on the thermal physical properties in the algorithm of the temperature compensation. In the temperature differences up to 60K, the high-accuracy velocity measurement was realized within the accuracy of ±1.6% by the thermo-anemometer with digital dynamic compensation system.
日本流体力学会の論文
2010-09-09