2014 Fiscal Year Final Research Report
Accuracy improvement of digital holography based particle image velocimetry
Project/Area Number |
24560213
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Research Category |
Grant-in-Aid for Scientific Research (C)
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Allocation Type | Multi-year Fund |
Section | 一般 |
Research Field |
Fluid engineering
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Research Institution | Osaka Sangyo University |
Principal Investigator |
OHMI KAZUO 大阪産業大学, デザイン工学部, 教授 (10144536)
|
Project Period (FY) |
2012-04-01 – 2015-03-31
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Keywords | デジタルホログラフィ / 粒子画像流速計測法 / 画像計測 / 位相シフト干渉法 / 奥行計測 |
Outline of Final Research Achievements |
Digital holography based particle image velocimetry still suffers from poor resolution of particle depth detection, partly because of the existence of imaginary twin images and DC term background image. The new idea of the present work is to use the phase-shifting interferometry based digital holography in stead of the in-line one without using the mechanical phase-shifting system. To do so it resorted to the use of a Heterodyne interferometry based phase-shifting system, which had been expected to and did work with higher capture frequency without loss of spatial resolution. Another issue of the digital holography based particle image velocimetry is the precision of the particle depth detection schemes from the reconstructed image. To overcome this difficulty, the present work introduced a new concept skewness factor regarding the morphological feature of the particle luminosity peaks and this new parameter did work successfully to measure the exact particle depth without ambiguity.
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Free Research Field |
流体工学,画像処理工学,応用光学
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