Accession Number : ADD017699
Title : System for Monitoring and Analyzing Field Energy Exposure.
Descriptive Note : Patent, Filed 6 Dec 93, 8 Aug 95,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s) : Scarzello, John F ; Feaga, Adam C ; Lenko, Daniel S
Report Date : 08 Aug 1995
Pagination or Media Count : 13
Abstract : A portable electromagnetic field exposure dosimeter includes a triaxial ferrite loaded coil sensor, a group of amplifiers and bandpass filters, a data control board, and a computer. The triaxial sensor receives electromagnetic radiation along three orthogonal axes for measurement which is channelled through a group of amplifiers and then bandpass filtered into three frequency signal ranges. One frequency range corresponds to exposure at 60 Hz and two of its harmonics. The second frequency range corresponds to high frequency pulsed energy. The third frequency range reflects body motion of a tested individual. The data control board converts such filtered signals into digital code and controls the flow of the converted data to random access memory and to the computer. The computer performs a Fast Fourier Transform on the converted data from the 60 Hz frequency range and then stores or displays the analyzed data as a function of frequency and time. The computer also stores or displays the data from the other two frequency ranges.
Descriptors : *ELECTROMAGNETIC RADIATION, *DOSIMETERS, *PATENTS, DIGITAL SYSTEMS, HIGH FREQUENCY, EXPOSURE(GENERAL), ENERGY, HARMONICS, RANDOM ACCESS COMPUTER STORAGE, FAST FOURIER TRANSFORMS, BANDPASS FILTERS, ELECTRIC COILS, CONTROL PANELS
Subject Categories : Electricity and Magnetism
Electrical and Electronic Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE