Adaptive flow-field measurements using digital holography

Jürgen W. Czarske; Nektarios Koukourakis; Bob Fregin; Jörg König; Lars Büttner

doi:10.1117/12.2252084

21 February 2017 Adaptive flow-field measurements using digital holography

Jürgen W. Czarske, Nektarios Koukourakis, Bob Fregin, Jörg König, Lars Büttner

Proceedings Volume 10074, Quantitative Phase Imaging III; 100740F (2017) https://doi.org/10.1117/12.2252084
Event: SPIE BiOS, 2017, San Francisco, California, United States

Abstract

Variations of the optical detection path-length in image correlation based flow-field measurements result in strong errors in position allocation and thus lead to a strong enhancement of the measurement uncertainty of the velocity. In this contribution we use digital holography to measure the wavefront distortion induced by fluctuating phase boundary, employing spatially extended guide stars. The measured phase information is used to correct the influence of the phase boundary in the detection path employing a spatial light modulator. We analyze the potential of guide stars that are reflected by the phase boundary, i.e. the Fresnel reflex, and transmitted. Our results show, that the usage of wavefront shaping enables to strongly reduce the measurement uncertainty and to strongly improve the quality of image correlation based flow-field measurements. The approaches presented here are not limited to application in flow measurement, but could be useful for a variety of applications.

Conference Presentation

Citation Download Citation

Jürgen W. Czarske, Nektarios Koukourakis, Bob Fregin, Jörg König, and Lars Büttner "Adaptive flow-field measurements using digital holography", Proc. SPIE 10074, Quantitative Phase Imaging III, 100740F (21 February 2017); https://doi.org/10.1117/12.2252084

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