216 レンティキュラーレンズを用いたリアルタイムホログラフィック干渉計による密度場測定

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  • Measurement of density distribution of fluids by real-time holographic interferometer using lenticular lens
  • レンティキュラー レンズ オ モチイタ リアルタイム ホログラフィック カンシ

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The three-dimensional density distribution could be measured using the computer tomography technique with interferogram image. The photoconductor-plastic hologram (PPH) is a new hologram device which can easily make the hologram for the real-time interferometer. Since the image contains 2D information, lots of images taken from different angles should be needed to reconstruct the 3D information. However, the optics configuration will be too complex to obtain the multi-directional image sirmaltaneously, even in the PPH system. Using the diffusion plate, the laser light could be diffused to multi-direction. When the hologram is recorded with the diffused laser, the multi-directional image can be obtained using only one hologram plate. In the computer tomography technique, only the holizontal direction is effective, while the diffused laser contains the whole direction, causing the noise on the hologram. In this study, the lenticular lens is used as the diffusion plate. The lenticular lens reflects the laser only in horizontal direction without the vertical (non-horizontal) direction. Therfore the multi-directional fringe images could be clearly obtained. In the experiment the helium jet was measured to demonstrate the effectiveness of the proposed system.

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