Imaging Non-equilibrium States in Hypersonic Flow by Slow Light Imaging Spectroscopy (SLIS)
Abstract
We propose to conduct research on the development of a new method for two dimensionalimaging of nonequilibrium states of molecular species in hypersonic environments. Our newapproach is based on slow light imaging spectroscopy (SLS ). This new method involves the delay of an image associated with a selected Raman or Rayleigh spectral feature by propagation of that image through a cell placed in front of the camera and containing an atomic vapor with anexceptionally high index of refraction gradient. The high gradient leads to a significant reductionin the speed of a pulse of light at a specific wavelength. That wavelength can be a selected Rayleigh or Raman line from a molecular gas in the sample volume. By time gating the camera, only the selected feature is imaged. This approach eliminates spectrometers, has an exceptionally high light collection efficiency, and provides an imaging capability for each individual spectral feature.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Aug 28, 2018
- Source ID
- FA95501810264
Entities
People
- Richard B. Miles
Organizations
- Air Force Office of Scientific Research
- Trustees of Princeton University
- United States Air Force