CARS (Coherent Antistokes Raman Scattering) Thermometry for Low and High Pressure Combustion Systems,

Abstract

This paper discusses the theory and application of broadband CARS spectroscopy for ambient (low) and high pressure combustion thermometry. The accuracy of broadband CARS is assessed from 300-3500 Kelvin for pressures around 1 bar, and from 300-700 Kelvin for pressures from 1-20 bar. The use of CARS thermometry for both 'average' and 'instantaneous' measurements is discussed. Systematic accuracy strongly depends on the quality of the spectral model used in the CARS data analysis step, CARS spectral modelling methods are discussed. Instantaneous CARS accuracy is importantly influenced by noise arising in both the broadband dye laser and the multichannel detector. Both of these factors and their relative influences are assessed. Application of CARS thermometry is illustrated by application to both in-cylinder studies of an operating production i.c. petrol engine and to turbulent combustion in an oil-fired 30 kilowatt furnace.

Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1986
Accession Number
ADP005525

Entities

People

  • Douglas A. Greenhalgh

Tags

DTIC Thesaurus Topics

  • Accuracy
  • Broadband
  • Combustion
  • Data Analysis
  • Detectors
  • Dye Lasers
  • Engine Components
  • Engines
  • High Pressure
  • Instrumentation
  • Laser Applications
  • Liquid Dye Lasers
  • Measurement
  • Measuring Instruments
  • Raman Scattering
  • Spectroscopy

Fields of Study

  • Physics

Readers

  • Optical Physics and Photonics.
  • Petroleum Engineering
  • Thermal Physics or Thermal Science.

Technology Areas

  • Directed Energy
  • Directed Energy - Lasers