Record Display for the EPA National Library Catalog


Main Title System for Measurement of Small Vibrations at Material Interfaces Induced by Electrostrictive Forces.
Author Ali, J. S. ; Joines, W. T. ;
CORP Author Health Effects Research Lab., Research Triangle Park, NC.
Year Published 1985
Report Number EPA/600/1-85/021;
Stock Number PB86-116530
Additional Subjects Electrostriction ; Vibration ; Radio frequencies ; Electrical properties ; Measurement ; Interactions ; Models ; Biological systems
Library Call Number Additional Info Location Last
NTIS  PB86-116530 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 157p
The mechanisms of interaction of ELF and ELF-modulated RF fields with biological systems is presently an active area of research. Some models propose that field-induced forces may influence certain observed biological effects such as RF hearing and calcium ion efflux. To investigate the validity of the field-induced force model for the calcium-ion efflux effect, a system is needed which is capable of exposing samples to ELF fields or to ELF-modulated RF fields. At the same time the induced vibration caused by the forces of electrostriction must be monitored preferably by a noncontacting method. A microwave phase-sensitive receiver was designed to sense the small vibrations. Limitations on the receiver sensitivity imposed by phase noise is discussed. Phase noise measurement systems were designed and used to characterize the key receiver components. A limiting amplifier in the IF section of the receiver eliminates the need for knowledge of the reflection coefficient of the object of interest for quantitative vibration measurements.