INFRARED TRANSMISSION STUDIES. VOLUME 4. THE INFLUENCE OF NUMEROUS WEAK LINES ON THE ABSORPTANCE OF A SPECTRAL BAND

Abstract

The influence of numerous weak spectral lines on band absorption is investigated. It is shown that a regivalidity always exists for the weak line approximation. There is almost always also a region of validity for the strong line approximation, unless the number of spectral lines increases very rapidly as the intensity approaches zero. The principal effects of the weak lines are to introduce points of inflection in the absorptance curves and to increase the intermediate range of values of pressure and absorber concentration over which neither the strong nor weak line approximation is valid. These effects are illustrated by examples. From a study of the shape of experimentally deter mined absorptance curves it is possible to deduce the number of weak lines in the frequency interval of interest.

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Document Details

Document Type
Technical Report
Publication Date
Apr 12, 1963
Accession Number
AD0405151

Entities

People

  • G. N. Plass

Tags

DTIC Thesaurus Topics

  • Absorption
  • Air Force
  • Bessel Functions
  • Doppler Effect
  • Experimental Data
  • Frequency
  • Government Procurement
  • Governments
  • Intensity
  • Intervals
  • Measurement
  • Numbers
  • Optics
  • Space Systems
  • Spectra
  • Spectral Lines
  • Square Roots

Fields of Study

  • Physics

Readers

  • Approximation Theory.
  • Mathematical Modeling and Probability Theory.
  • Optical Physics and Photonics.