Application of in-line digital holography to multiple plane velocimetry


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

MEASUREMENT SCIENCE AND TECHNOLOGY, cilt.12, ss.1392-1397, 2001 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 12 Konu: 9
  • Basım Tarihi: 2001
  • Doi Numarası: 10.1088/0957-0233/12/9/303
  • Dergi Adı: MEASUREMENT SCIENCE AND TECHNOLOGY
  • Sayfa Sayıları: ss.1392-1397

Özet

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.