Department of Physics
Research, teaching and outreach in Physics at UW–Madison

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Chaos & Complex Systems Seminar
Imaging around obstacles and into lunar caves using scattered light
Date: Tuesday, December 8th
Time: 12:05 pm - 1:00 pm
Place: 4274 Chamberlin (refreshments will be served)
Speaker: Andreas Velten, UW Department of Molecular Biology
Abstract: The Computational Optics Group at the UW Laboratory for Optical and Computational Instrumentation (LOCI) develops novel imaging systems by combining new hardware designs with novel computational image reconstruction methods. The traditional method of imaging is based on hardware that resembles the human eye to produce images suitable for analysis and pattern recognition by a human viewer. A traditional camera like this only accesses a very small fraction of the information provided by the light field. Most of the light detected by optical systems occurs in the form of multiply scattered photons that can not be used to create an image in this traditional way. In this talk I will show different systems that, using custom methods to selectively capture and control photon time of flight, allow us to capture information inaccessible to a regular camera.<br>
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Our Modular Indirect Remote Imaging System (MIRIS) uses ultrafast illumination and detection to collect and utilize light transport information. A laser is used to direct a pulse train towards one of the visible surfaces in a scene. The light bounces off of this surface and reflects off objects in the scene before heading back towards the visible scene where it is imaged with high time resolution by a camera. Images of the scene are reconstructed from the collected time-encoded information using a modified backprojection algorithm.<br>
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In collaboration with the NASA Jet Propulsion Lab, we are performing studies to apply this method to explore the inside of caves on the moon from a low lunar orbit.
Host: Sprott
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