流速標準のためのレーザドップラー流速計校正装置の開発と不確かさ解析

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  • Development and Uncertainty Analysis of a Laser Doppler Velocimeter Calibrator for the Flow Velocity Standard.
  • リュウソク ヒョウジュン ノ タメ ノ レーザ ドップラー リュウソクケイ コウセイ ソウチ ノ カイハツ ト フタシカサ カイセキ

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A calibrator of laser Doppler velocimeters (LDVs) has been developed as the measurement standard of flow velocity. This calibrator has a rotor with single fine wire and generates various velocities from the rotation. To minimize the influence of wire deformation, the orbit diameter in movement was measured with an interferometer as the distance of a rotor traversing. A measurement control volume of tested LDV was used to detect the wire orbit position. The calibration factor of tested LDV was decided as a ratio of wire velocity to the average frequency of the Doppler burst signal. In this paper, the uncertainty of LDV calibration with this calibrator was analyzed and unknown sources were quantified by the experiment. The maximum uncertainty source was pitching of the carriage table, which would be reduced by remodeling of the devices. The combined standard uncertainty of the calibration was about 100 ppm in the velocity range of 2 to 30 m/.

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