著者

川橋 正昭 細井 健司 田村 健一 塩崎 孝壽 平原 裕行 山本 勝一 田中 正雄

出版者

社団法人 可視化情報学会

雑誌

可視化情報学会誌 (ISSN:09164731)

巻号頁・発行日

vol.10, no.1, pp.23-26, 1990

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We have proposed a new technique of illumination in a observation plane by sweeping of two laser beams scanned by the same face of a polygon mirror scanner. With this technique seeding particles in the plane are illuminated by each sweeping beam with short time difference controlled by incident cross angle of two beams to the scanner and angular velocity of the scanner. This can be named dual-beam-sweep laser speckle velocimetry.<BR>In this report, measurements of velocity distribution of flow in a T-type branch duct are performed by means of the velocimetry, and the results are compared with numerical results obtained by the finite volume method considering with k-e turbulence model.

著者

川橋 正昭 細井 健司 平原 裕行 塩崎 孝壽

出版者

社団法人 可視化情報学会

雑誌

流れの可視化 (ISSN:02873605)

巻号頁・発行日

vol.9, no.34, pp.317-320, 1989

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The Laser Speckle Velocimetry (LSV) is one of the most useful method of quantitative flow visualization, because it gives two-dimensional instantanious velocity distributions. But this method is not suitable for continuous measurement of unsteady flow, because normally the repetition rate of pulse laser is low.<BR>We have reported a new illumination technique by making use of CW laser, and named the Beam-Sweep Laser Speckle Velocimetry (BS-LSV). A plane of observation in a flow field seeded with tracer particles is illuminated by periodical one-way sweeps of a laser beam instead of pulsed light sheets. This method is suitable for measurements of an unsteady flow, because the sequential specklegrams can easily be recorded continuously.<BR>In this report, BS-LSV is applied to two-dimensional velocity measurements and visualization of pulsating flow in a peristaltic pump.