Temperature profiling of the atmosphere from an airborne lidar by dispersion of filtered rayleigh scattering in atomic and molecular vapors

Anuj Rekhy, Alexandros Gerakis, David Feng, Mikhail N. Shneider, Arthur Dogariu, Richard Miles

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

The main focus of this paper is aimed at using dispersion caused by atomic or molecular transitions as a measurement technique to resolve the spectral components of the RayleighBrillouin scattering for a look-down lidar configuration. The motivation is to measure the atmospheric temperature and density profiles below a supersonic aircraft to enable prediction of sonic boom signatures. This paper contains comparisons of the backscattered number of photons collected for a laser shot down at different angles and wavelengths from an aircraft. For lidar operating at 532 nm and 780 nm, we derive the normalized Rayleigh-Brillouin scattering lineshapes from 0-15 Km for every 1 Km. We show the formulae to generate transmission and refractive index profiles of an atomic vapor and apply them to the dispersion of the lidar return light imaged through a rubidium vapor cell containing a single prism and a vapor cell containing six prisms at mounted Brewster’s angles. The dispersion allows the imaging of the Raleigh Brillouin spectrum while simultaneously suppressing scattering from particulates and aerosols. The full width at half maximum points from the Rayleigh-Brillouin scattering can be used to measure temperature. It is also possible to measure wind velocities along the direction of the laser propagation by measuring the Doppler frequency shift of the Mie scattering spectral components. Modeling details of a vapor prism cell and six vapor prism cells are shown, while experiments are done as a proof of concept. Atomic rubidium is used with a single prism vapor cell and molecular iodine is used with a six prism vapor cell.

Original languageEnglish (US)
Title of host publicationAIAA Aviation 2019 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
Pages1-22
Number of pages22
ISBN (Print)9781624105890
DOIs
StatePublished - 2019
EventAIAA Aviation 2019 Forum - Dallas, United States
Duration: Jun 17 2019Jun 21 2019

Publication series

NameAIAA Aviation 2019 Forum

Conference

ConferenceAIAA Aviation 2019 Forum
Country/TerritoryUnited States
CityDallas
Period6/17/196/21/19

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Aerospace Engineering

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