Abstract

Digital holograms are effectively a window through which we can observe a full, live, three-dimensional (3D) view of a test volume that exists at any arbitrary location from the imaging focal plane. Once a hologram is stored in digital memory, it can be employed computationally, using wavefront reconstruction to numerically focus a depth plane in virtual space. This essentially enables an operator to scan the field-of-view, plane-by-plane through 3D dimensional space enabling volumetric measurements by a single digital hologram. Advances in high-speed imaging technology and illumination systems have created opportunities for developing ultrafast digital holography systems that enable the study of dynamic events in three dimensions. Such systems can be a very powerful tool for 3D object and particle field measurements in multiphase processes occurring in supersonic and hypersonic environments. This talk presents simulations and experiments informing the design and development of digital in-line holography systems with acquisition rates ranging from 100 kilohertz to 100 million frames per second. The systems are used to visualize 3D drop deformations, probe shockwave dynamics and volumetrically-resolve microscale particle-fields created in hypervelocity impact and laser ablation experiments.  

Bio

Dr. Mansoor received his Ph.D. degree in mechanical engineering from KAUST in 2016 and conducted post-doctoral research at Utah State University to perform free-surface flow and swarm analysis studies. He worked at Los Alamos National Laboratory as a director’s postdoc to investigate shock induced turbulent mixing at the vertical shock tube facility before joining Apple to lead cross-functional teams of scientists and engineers in designing and integrating depth sensing Face ID modules into iPhone products. Dr. Mansoor is now a Sr. Optical Scientist at MetroLaser Inc in Laguna Hills, California where he specializes in developing high-speed digital holography systems and numerical methods for wavefront reconstruction. He is a technical lead for engineering lens-less digital holographic microscopes and developing three-dimensional visualization software.