Methodology for Making a Self-Absorption Correction to the Simple Copper-Line-Ratio Technique Used for Arc-Tunnel Enthalpy Measurements.
Abstract
Detailed theory and analytical procedures are presented which provide a method for self-absorption correction of the simple 5106/5153 angstrom copper-line-ratio technique used to measure arc-tunnel stagnation enthalpy. This correction procedure involves simultaneous measurement of the 5106 angstrom line full half-width in order to infer copper number density and gas temperatue from the self-absorption broadened line profile shape, and the simple one intensity ratio. Theoretical formulations of other dominant line-broadening contributions (i.e., Doppler, Van der Waals, and Stark effects) are also included in order to accurately determine the degree of line broadening that results from self-absorption alone. Typical data reduction curves are presented to demonstrate the correction process. These curves indicate that large errors in measured enthalpy could result if self-absorption was not properly accounted for in the data analysis procedure. An error estimate is also included to indicate the typical accuracy presently obtainable from this self-absorption correction method. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1979
- Accession Number
- ADA078686
Entities
People
- Anthony A. Boiarski
Organizations
- University of Dayton