著者

栗原 昇 寺尾 吉哉 中尾 晨一 高本 正樹

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 B編 (ISSN:03875016)

巻号頁・発行日

vol.65, no.637, pp.3029-3034, 1999-09-25 (Released:2008-03-28)

参考文献数

10

被引用文献数

3

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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/.

著者

山崎 哲 高本 正樹 細井 賢三 山崎 均 新井 悟司 清水 和義

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. B編 (ISSN:03875016)

巻号頁・発行日

vol.66, no.642, pp.619-626, 2000-02-25

参考文献数

12

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The partial flow dilution method is one of the typical measurement methods for particulate matter emission from diesel engines. In this method, exhaust gas at a transient flow rate should be transferred to a dilution tunnel at a constant ratio of exhaust gas. The present partial flow dilution method is used under steady-state engine operating conditions in lieu of direct flow rate measurement of exhaust gas. A more practical control of exhaust emission is, however, required world widely; therefore development of an exhaust gas flowmeter is indispensable in the partial flow dilution method for transient engine operating conditions. An ultrasonic exhaust gas flowmeter has been developed and been demonstrated to be capable of measuring the exhaust gas flow rate with sufficient accuracy.