Wavefront-shaping for flow-field measurements

Flow field measurements of fluids are important for several applications in process engineering and biomedical sciences. However, there are environments where the measurements are harmed by aberrations or scattering, which leads to a strong increase of the measurement uncertainty. Supported by the technological progress of spatial light modulators (SLM) and the wave front sensing techniques, sensor-based adaptive optics enables to overcome these limitations, as it allows for flexible control of light-fields. In this contribution we analyze the usage of time-reversal and wave front shaping techniques for both turbidity suppression and aberration correction. The effect of scattering or fluctuating media on the measurement accuracy of image-correlation based flow-field measurements is investigated and results of first measurements and simulations are presented and limitations are discussed. We show that time-reversal, digital holography and wave front shaping techniques have the potential to strongly improve the quality of disturbed flow-field measurements.