Accession Number : ADA180426

Title :   Atmospheric Propagation Studies at Near-Millimeter Wavelengths.

Descriptive Note : Final rept. 1 Oct 81-31 Aug 86,

Corporate Author : CASE INST OF TECH CLEVELAND OH

Personal Author(s) : Claspy,Paul C. ; Merat,Francis L.

Report Date : 02 MAR 1987

Pagination or Media Count : 35

Abstract : The principal experimental data obtained from this program are the results of static measurements of the sensitivity of attenuation at 337 GHz to atmospheric water vapor concentration in the temperature range of 13 to 24 C. Estimates were also made, from that data, of the absolute attenuation coefficient for clear air at that frequency and over the same temperature range. As a results of reliability difficulties experienced with the laser transmitter, it was not possible to complete experiments which would have yielded coherence property data. Major theoretical contributions of the program include the development of a weak fluctuation model of propagation of a general beam wave through an atmosphere characterized by a fluctuating complex index of refraction, and the complete development and analysis of the signal processing techniques necessary to invert intensity data from a quasi optical experiment to obtain the atmospheric mutual coherence function (MCF).

Descriptors :   *ATMOSPHERIC SCATTERING, *REFRACTIVE INDEX, *OPTICAL PROPERTIES, COEFFICIENTS, LASERS, TRANSMITTERS, RELIABILITY, MEASUREMENT, STATICS, LOW STRENGTH, MODELS, VARIATIONS, AIR, COHERENCE, WAVES, SIGNAL PROCESSING, RANGE(EXTREMES), TEMPERATURE

Subject Categories : Atmospheric Physics
      Radiofrequency Wave Propagation
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE