Accession Number : AD0435742


Title :   MEASUREMENT OF PHASE CONSTANT FOR ROCK PROPAGATED SIGNALS


Corporate Author : RAYTHEON CO NORWOOD MA


Personal Author(s) : Tsao, Carson K H


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/435742.pdf


Report Date : Dec 1963


Pagination or Media Count : 22


Abstract : A method is described for determining the phase constant of the rock medium below the surface of the earth. The constant is deduced from the measured phase angle of the mutual impedance between two vertically polarized antennas placed in drill holes extending into the rock. Experiments were conducted on Cape Cod, Massachusetts, deter mine the phase constant of the rock between two 1000-foot drill holes, searated by a distance of 6000 feet, at frequencies between 100 and 4200 cps. Electrically short monopoles were used in the drill holes, with the overburden above the rock serving as a ground plane. Reference phase was derived from Loran C transmissions at both transmitting and receiving ends of the path. The measured phase constants at these frequencies indicate a large loss tangent for the medium.


Descriptors :   *ROCK , EARTH(PLANET) , FREQUENCY , LORAN , PROPAGATION , RADIO WAVES


Subject Categories : Geology, Geochemistry and Mineralogy


Distribution Statement : APPROVED FOR PUBLIC RELEASE