Abstract
Optical tomography(OT) which consists of interferometry and computer tomography is the important technique that can measure the transient 3D density distribution.But there were difficulties of experimental conplexity when realtime interferometer was used. 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 simultaneously. Using the diffusion plate, the laser light could be diffused to multi-direction.Image can be obtained usingonly one hologram plate with multi-directional information. 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 to reflects the laser only in 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.
