ANALYTICAL STUDIES PERTAINING TO THE MEASUREMENT OF LIGHT ABSORPTION IN AIR

Abstract

Experimental methods proposed for the measurement of the absorption coefficient of light in air are analyzed. The calculations are primarily intended for the 0.5 to 1.2 micron wavelength region where for certain wavelengths the absorption coefficient to be measured is estimated to be of the order of 10 to the minus 9th power/cm. (For the 10.6 microns wavelength, the absorption is larger and the scattering is less of a problem.) The effects of scattering, heat conduction, static and acoustic pressure variations are examined and are related to the problem of detecting the signals produced by the absorption of heat from the laser beam. Both pulsed and cw schemes are considered. The measurement of the static pressure rise in a narrow tube appears as a feasible, although marginal method which offers some hope of success.

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Document Details

Document Type
Technical Report
Publication Date
Nov 30, 1967
Accession Number
AD0665674

Entities

People

  • Bela A. Lengyel

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Absorption
  • Absorption Coefficients
  • Abstracts
  • Acoustic Propagation
  • Acoustic Waves
  • Coefficients
  • Department Of Defense
  • Detection
  • Differential Equations
  • Heat Energy
  • Laser Beams
  • Measurement
  • Radiation
  • Scattering
  • Static Pressure
  • Thermal Conductivity
  • Thermodynamics

Fields of Study

  • Physics

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Pulsed Power and Plasma Physics.
  • Systems Analysis and Design

Technology Areas

  • Directed Energy
  • Directed Energy - Lasers