Digital image plane holography as a three-dimensional flow velocimetry technique

Julia Lobera Salazar; N. Andres; M. P. Arroyo

doi:10.1117/12.516651

27 May 2003 Digital image plane holography as a three-dimensional flow velocimetry technique

Julia Lobera Salazar, N. Andres, M. P. Arroyo

Proceedings Volume 4933, Speckle Metrology 2003; (2003) https://doi.org/10.1117/12.516651
Event: Speckle Metrology 2003, 2003, Trondheim, Norway

Abstract

This paper shows the feasibility of applying digital image plane holography (DIPH) as a fluid velocimetry technique for simultaneous measurements of all three components of the velocity field. As a first approach DIPH has been set up to measure a single fluid plane. The recording apparatus is a digital speckle interferometer (DSPI) with spatial phase shifting (SPS). The speckle interferometer has an out-of-plane sensitivity and the off-axis reference beam produces a spatial modulation in the pattern (hologram) recorded by the CCD camera. From the interferometric and photographic analysis of the reconstructed object wave, the three velocity components in the fluid plane are obtained. The complex amplitude of the object wave is calculated by the application of a Fourier-transform method to the hologram. The phase change between two subsequent frames yields an out-of-plane component of the velocity field. The two in-plane components are obtained, as in digital speckle photography, by cross correlation of the reconstructed object wave's intensity. Some quantitative results in a Rayleigh-Benard convective flow are presented. In the final setup, angular multiplexing with coherence length control has been introduced in order to simultaneously measure the velocity fields in two fluid planes. Some preliminary results from the convective flow are presented.

Citation Download Citation

Julia Lobera Salazar, N. Andres, and M. P. Arroyo "Digital image plane holography as a three-dimensional flow velocimetry technique", Proc. SPIE 4933, Speckle Metrology 2003, (27 May 2003); https://doi.org/10.1117/12.516651

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available