Single-shot Ultra-Short Pulse Holographic Imaging of Dense Fuel Sprays
Abstract
Major Goals: The University of California, Irvine (UCI) and Colorado School of Mines (CSM) recently completed a proof of concept ARO project to demonstrate the suitability of using Ultra-Short Pulse Off-Axis digital holography (USPODH) to image high pressure fuel sprays. The project showed that USPODH can produce 3D images of a realistic fuel spray from a hologram created by a single 100 fs pulse. The current project extends the results from the recently concluded proof-of-concept to investigate the full potential of the ultra-short pulse holographic technique and demonstrates its effectiveness for realistic sprays. The comparison of the technique in direct contrast to alternatives (in particular, the quality of the images and the details of the spray structure were to be quantified) were to take place at the Colorado School of Mines, but changes to the scope of work (i.e., the curtailment of the content to the initial 19-month phase) focused the effort on design improvements. The ultra-short pulse holography approach faces important questions regarding practical limitations when implemented in realistic spray systems. Examples include quantifying the trade-off between resolution and working distance, evaluating the potential for high framing rates, assessing the optical density limits, and the potential obscuration in situations where the scatterer size and number density prevent phase field reconstruction, and ultimately if the image content proves to contain valuable quantifiable information on spray formation dynamics. Hence, to evaluate the ultra-short holography method, we explore these aspects of the potential of Ultra-Short Pulse Off-Axis digital holography in imaging through optically dense media.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 05, 2022
- Accession Number
- AD1190174
Entities
People
- Derek Dunn-rankin
- Jason Porter
- Terry Parker
Organizations
- Colorado School of Mines
- Florida Polytechnic University
- University of California, Irvine