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

Abstract

This report describes progress 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. The timing parameters for the current ASOPS instrument are described and consideration is given to the optimization of these parameters. Results from the study of the sodium atom in an atmospheric flame are presented. Instrumental changes are shown that considerably improve the ASOPS signal-to-noise ratio. A technique for optimization of ultra violet generation is demonstrated and initial hydroxyl fluorescence experiments are described. Keywords: Pump probe spectroscopy; Combustion; Laser diagnostics; Stimulated emission.

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Document Details

Document Type
Technical Report
Publication Date
Feb 28, 1989
Accession Number
ADA207003

Entities

People

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

Organizations

  • Purdue University

Tags

DTIC Thesaurus Topics

  • Chemistry
  • Classification
  • Combustion
  • Dye Lasers
  • Engineering
  • Fluorescence
  • Frequency
  • High Pressure
  • Laser Beams
  • Laser Induced Fluorescence
  • Lasers
  • Liquid Dye Lasers
  • Measurement
  • Mechanical Engineering
  • Repetition Rate
  • Sampling
  • Spectroscopy

Fields of Study

  • Physics

Readers

  • Analytical Chemistry
  • Internal Combustion Engine (ICE) Technology.
  • Optical Physics and Photonics.

Technology Areas

  • Directed Energy
  • Directed Energy - Lasers