SOME STUDIES OF THE FLUCTUATIONS IN EMISSION FROM THE EXHAUST GASES OF SMALL ROCKET ENGINES

Abstract

An experimental analysis was made of the frequency spectrum of fluctuations in radiant emission from the exhaust gases of small rocket motors near the nozle exit. This study was to determine, if possible, an optimum chopping frequency for a device being designed to measure small optical absorption (approximately 1%) in rocket flames. The principle of operation was sggested by Oldenberg. In brief, the apparatus consists of a collimated beam of greybody radiation, chopped by a silvered sector disk in such a manner as to produce two sinusoidally modulated beams, 180 deg out of phase. One beam passes through the flame under study, and the other is used as a reference. Emission from the flame is eliminated by a synchronous amplifier tuned to the chopping frequency.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1961
Accession Number
AD0268333

Entities

People

  • F. C. Harshbarger
  • M. Dorian

Organizations

  • General Dynamics

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Amplitude
  • Analyzers
  • Cathode Followers
  • Chambers
  • Combustion
  • Combustion Chambers
  • Detectors
  • Engines
  • Exhaust Gases
  • Frequency
  • Frequency Response
  • Measurement
  • Resonant Frequency
  • Rocket Engines
  • Rockets
  • Wave Analyzers
  • Waves

Fields of Study

  • Physics

Readers

  • Internal Combustion Engine (ICE) Technology.
  • Radar Systems Engineering.
  • Rocket Propulsion.