Three-Dimensional Flow Tracking in a Micro Channel with High Time Resolution Using Micro Digital-Holographic Particle-Tracking Velocimetry |
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Authors: | Shin-ichi Satake Tomoaki Kunugi Kazuho Sato Tomoyoshi Ito Jun Taniguchi |
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Institution: | (1) Department of Nuclear Engineering, Graduate School of Engineering, Kyoto University, Yoshida, Sakyo, Kyoto 606-8501, Japan;(2) Toyota Industries Corp., 2-1 Toyoda cyou, Kariya, Aichi 448-8671, Japan;(3) Japan Science and Technology Agency (JST), Japan;(4) Department of Electronics and Mechanical Engineering, Chiba University, 1-33 Yayoi, Inage-ku, Chiba 263-8522, Japan;(5) Department of Applied Electronics, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan |
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Abstract: | A micro digital-holographic particle-tracking velocimetry (micro-DHPTV) method for high time-resolution flow field measurement
in a micro-channel is developed. The system consists of an objective lens, a high-speed camera and a single high-frequency
double pulsed laser. Particle positions in a three-dimensional field can be reconstructed by a computer-generated hologram.
The time evolution of a three-dimensional water flow in a semicircular micro-channel of 100-μm width and 40-μm depth is obtained
successfully using this micro-DHPTV system. The three-dimensional measurement volume of the system is 410 × 100 × 40 μm3 and is irradiated by one laser beam with the time resolution of 100 μs and a reputation rate of 1 kHz. Consequently, 130
velocity vectors in the semicircular micro-channel can be obtained instantaneously. A significant aspect of this method is
that even though both the laser and camera are located in line and perpendicular to the flow direction, velocity vectors can
be obtained by reconstructing the particle positions via the computer hologram and the semicircular cross section shape of
the micro-channel can be resolved. |
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Keywords: | holography computational optics optical computer hologram micro-channel particle tracking velocimetry |
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