Accession Number : AD0292992

Title :   DEVELOPMENT OF BROAD-BAND ELECTROMAGNETIC ABSORBERS FOR ELECTRO-EXPLOSIVE DEVICES

Corporate Author : FRANKLIN INST PHILADELPHIA PA LABS FOR RESEARCH AND DEVELOPMENT

Personal Author(s) : MOHRBACH,PAUL F. ; WOOD,ROBERT F.

Report Date : 31 OCT 1962

Pagination or Media Count : 1

Abstract : A discussion of the parameters required to optimize the attenuating ability of samples made from carbonyl iron is presented. Analysis of the data indicates that the inability to increase the permeability of the coated iron above 10 is limiting the attenuation. While the permeability of the pure carbonyl iron is over 1000, no success has been achieved in approaching this value when the particles are coated. The use of a presintering operation in the fabriction of ferrites has controlled shrinkage to within a reasonable degree. Attenuation measurements of Ni-Zn ferrites have been made. Maximum attenuation obtained is in the order of 7 db/cm at 500 Mc. Steps by which attenuation can be improved are discussed. Development of a plastic binder containing barium titanate has been continued. A dielectric constant of 30 is the highest value yet obtained. Voltage breakdown is about 150 volts per mil. Two ferrite samples with insulating coatings (K = 8000) applied to the outer periphery were evaluated. Both samples showed an appreciable decrease in attenuation which was not expected. (Author)

Descriptors :   *DETONATORS, *ELECTROMAGNETIC RADIATION, *FERRITES, *RADIOFREQUENCY, ABSORPTION, ATTENUATION, BROADBAND, DIELECTRICS, HAZARDS, IRON COMPOUNDS, LOW FREQUENCY, TRANSMISSION LINES

Distribution Statement : APPROVED FOR PUBLIC RELEASE