Laser Doppler Airspeed and Altitude Sensor.

Abstract

The feasibility of an air data system based on the measurement of the resonant fluorescence of carbon dioxide in the atmosphere is discussed. The Doppler shift of the fluorescence gives the air velocity and the linewidth gives the pressure altitude. A system using a tunable diode laser has been set-up and characterized. Attempts to measure back-scattered fluorescence were unsuccessful, but inelastic scattering in the forward direction was observed. Mechanisms for this are discussed but no firm conclusion is reached. A correlation technique for processing the data is discussed and its accuracy computed. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1981
Accession Number
ADA096980

Entities

People

  • M. J. Rudd

Organizations

  • BBN Technologies

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Air Force
  • Aircrafts
  • Altitude
  • Backscattering
  • Carbon Dioxide
  • Carbon Dioxide Lasers
  • Detection
  • Detectors
  • Doppler Effect
  • Frequency
  • Heterodyne Detection
  • Laser Diodes
  • Lasers
  • Measurement
  • Scattering
  • Signal Detection
  • Signal Processing

Readers

  • Fluid Dynamics.
  • Spectroscopy.
  • Systems Analysis and Design

Technology Areas

  • Directed Energy
  • Directed Energy - Lasers