Asynchronous Optical Sampling for Laser-Based Combustion Diagnostics in High-Pressure Flames

Abstract

This is the final report on the development of a new laser-based combustion diagnostic for the quantitative measurement of both major and minor species in high-pressure flames. The technique, Asynchronous Optical Sampling (ASOPS), is a state-of-the-art improvement in picosecond pump/probe spectroscopy. A method is presented for vastly improving the output of the synchronously mode-locked dye laser systems. The beat frequency is increased to 155.7 kHz. Subnanosecond excited-state lifetimes for Na are obtained with only 128 averages, for the first time allowing data to be obtained within the time scale of turbulence. The first quantitative evaluation of the ASOPS technique in a flame environment is presented. Pump/probe spectroscopy, Laser diagnostics, Combustion, Stimulated emission.

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Document Details

Document Type
Technical Report
Publication Date
Apr 23, 1992
Accession Number
ADA250206

Entities

People

  • Fred E. Lytle
  • Galen B. King
  • Normand M. Laurendeau

Organizations

  • Purdue University

Tags

Communities of Interest

  • Human Systems
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Amplifiers
  • Chemistry
  • Classification
  • Combustion
  • Dye Lasers
  • Engineering
  • Frequency
  • Frequency Combs
  • Frequency Synthesizers
  • High Pressure
  • Laser Applications
  • Laser Spectroscopy
  • Lasers
  • Liquid Dye Lasers
  • Measurement
  • Mechanical Engineering
  • Spectroscopy

Fields of Study

  • Physics

Readers

  • Combustion science or combustion engineering.
  • Optical Physics and Photonics.

Technology Areas

  • Directed Energy
  • Directed Energy - Lasers