DURIP: Acquisition of ultrafast laser system for naval hydrodynamics
Abstract
This proposal aims to acquire an ultrafast laser system to develop a new class of diagnostics for naval hydrodynamics as well as the characterization of the marine atmospheric boundary layer, which are both of direct interest to ONR. Specifically, the laser system will enable to adapt concepts developed for sprays to multiphase flows, such as the bubbly wake of surface ships. Bubbly wakes have several characteristic signatures and it is desirable to better understand their source and long term evolution. The first proposed diagnostics that will be developed with the laser will enable to characterize the spatio-temporal evolution of the size distribution of bubbles (particularly the small ones) present in the such flows and turbulent free surface flows that are currently studied by the PI. It will also enable to measure the velocity of the bubbles. It is complimentary to existing diagnostics that are applicable for high void fractions and that ONR issupporting. However, those diagnostics can only resolve mean density (x-ray densitometry) or the larger bubbles (x-ray tomography). Because there is no radiation management associated with the diagnostics, the system can be deployed in other laboratories and even in the field. The PI has experience conducting in-situ experimental campaigns and the laser system will be mounted on a transportable cart for that purpose. This increases the potential use of the laser beyond the PI???s laboratory. Furthermore, the laser is very flexible source of high fluence photons and can be used for multiple diagnostics. They include spectroscopic techniques, nonlinear optical processes, which will result in very intensive development efforts for the PI. With ultrafast lasers becomingmore affordable and accessible, this equipment grant will lead to other experimental groups exploring ultrafast lasers for naval hydrodynamic and marine atmosphere investigation resulting in new range of quantities that can be resolved for ONR.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jul 27, 2018
- Source ID
- N000141812657
Entities
People
- Philippe Bardet
Organizations
- George Washington University
- Office of Naval Research
- United States Navy