Phase retrieval method for digital holography with two cameras in particle measurement

Yohsuke Tanaka, Shunsuke Tani, and Shigeru Murata
Optics Express
Oct. 2016, Vol.24, Issue.22 25233-25241



研究成果

この論文では，新たに提案した微粒子計測における2台の高速度カメラを用いた位相回復法について説明しています．主な結果は，位相回復法で必要となる2枚のホログラム間距離が，得られる画像のSN比と反復計算回数に大きな影響を与えることを明らかにしています．また，具体的なカメラの設置方法や校正方法も明らかにしています．最後に4,000 fpsで自由落下する微粒子群(平均粒径70μm)のホログラム(Fig. (a))を記録し，従来のGabor型のホログラフィ(Fig. (b))では得られなかった高コントラストなホログラム再生像(Fig. (c))が得られました．今後，本手法は，高速で移動する噴霧液滴，マイクロバブル，固体微粒子などの微粒子計測に幅広く役立つことが期待されています．

Holography

Fig. (a) Experimental holograms of settling particles recorded at 4,000 fps.

Gabor

Fig. (b) Reconstructed holograms using the Gabor holography without phase.

Phase retrieval

Fig. (c) Reconstructed holograms using the present method with retrieved phase.
関連業績
  1. Camera layout for phase retrieval method with two cameras in digital holography
    Yohsuke TANAKA, Shunsuke TANI and Shigeru MURATA
    ICHSIP 31, Paper Number:1B-P08, Suita, Osaka, Japan, November 7-10, 2016.

  2. Phase Distribution Measurement of Transparent Film Using Digital Holography with Phase Retrieval Method
    Hirotaka YAMAOKA, Yohsuke TANAKA, Shunsuke TANI and Shigeru MURATA
    ICHSIP 31, Paper Number:1B-P07, Suita, Osaka, Japan, November 7-10, 2016.

  3. Phase retrieval method for holographic particle measurement with two cameras
    Yohsuke Tanaka, Shigeru Murata, Shunsuke Tani
    9th International Conference on Multiphase Flow, Paper Number:327, Firenze, Italy, May 22-27, 2016.

  4. Positional adjustment of a phase retrieval holographic method for particle measurement with two cameras
    Yohsuke Tanaka, Tasuku Nakajima, Shigeru Murata
    The 9th International Symposium on Measurement Techniques for Multiphase Flows, Paper Number:B221, Sapporo, Hokkaido, Japan, July 23-25, 2015.


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