Accession Number:

ADB067868

Title:

Extinction of CO2 Laser Radiation Under Adverse Weather Conditions

Descriptive Note:

Final rept. Oct 1978-Oct 1981

Corporate Author:

AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH

Personal Author(s):

Report Date:

1982-06-01

Pagination or Media Count:

150.0

Abstract:

Results of extinction measurements of CO2 laser radiation under adverse weather are presented. Data on eight different lines has been collected using a phase lock receiver with an aperture three times the beam diameter. The system dynamic range of 72 dBs is limited by the use of pyroelectric detectors. It was found that during dense fog measurements, the extinction encountered exceeded the dynamic of range of the system more than 50 of the time. Reported measurements include extinction as a function of wavelength, time, and atmospheric particulates. Experimental measurements in fogs with extinction ranging from 1 to 72 dBkm, in rain with extinction ranging from 2 to 17 dBkm, and in light snow with extinction ranging from 3 to 14 dBkm are reported. Particle size data for over 150 fog size distributions have been collected. Measurements show that transmission losses in dense fog can easily be six orders of magnitude greater than losses in heavy rain. Results indicate that extinction of CO2 laser radiation in adverse weather is at best, a very weak function of wavelength.

Subject Categories:

  • Atmospheric Physics
  • Radiation and Nuclear Chemistry
  • Radioactivity, Radioactive Wastes and Fission Products

Distribution Statement:

APPROVED FOR PUBLIC RELEASE