Application of in-line digital holography to multiple plane velocimetry

COETMELLEC S., BURAGA-LEFEBVRE C., LEBRUN D., Ozkul C.

MEASUREMENT SCIENCE AND TECHNOLOGY, vol.12, no.9, pp.1392-1397, 2001 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 12 Issue: 9
  • Publication Date: 2001
  • Doi Number: 10.1088/0957-0233/12/9/303
  • Journal Name: MEASUREMENT SCIENCE AND TECHNOLOGY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1392-1397
  • Istanbul Technical University Affiliated: No

Abstract

We present the preliminary results of a digital holographic system that can determine the two-dimensional velocity vector fields in several slices of a sample volume. A CCD camera directly records the diffraction patterns of small particles illuminated by a double-pulse laser diode. In fact, the diffraction can be interpreted as a convolution with a wavelet family of functions. The scale parameter a is related to the distance z between a particle and the CCD camera. Then, the intensity distributions in a plane located at a distance z are reconstructed by computing the wavelet components for the corresponding scale parameter a. Afterwards, a particle image velocimetry algorithm is applied to the numerically reconstructed pair of images. The feasibility of this technique is demonstrated for two simulated displacements.