Accession Number : AD0762620

Title :   Cable Engineering.

Descriptive Note : Final rept.,

Corporate Author : SYLVANIA ELECTRONIC SYSTEMS-WEST MOUNTAIN VIEW CALIF

Personal Author(s) : Miller,G. Kirby

Report Date : 28 JAN 1971

Pagination or Media Count : 54

Abstract : A study and experimental program have shown that certain coaxial cables can be treated in such a way that they become good electromechanical transducers sensitive to mechanical excitation at any point along their lengths. The sensitizing treatment is thermoelectric in nature and relies on the electret property of the cable's dielectric layer. Up to 16 db enhancement in electromechanical sensitivity has been observed in cables with TFE (Tetrafluoroethylene) teflon dielectrics due to the thermoelectric charging treatment. After a ten day settling period following treatment the sensitivity of such cables is quite stable with time decreasing by less than about 1/2 db per doubling of time. An analytical model is derived which indicates how the cable's sensitivity depends on its cross-dimensions, length, electret internal voltage, and the frequency and amplitude of the mechanical excitation. (Author)

Descriptors :   (*COAXIAL CABLES, VIBRATION), DETECTORS, ELECTRETS, HALOCARBON PLASTICS, TRANSDUCERS

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE