Accession Number : AD0430228


Title :   HERO SUPPORTING STUDIES.


Descriptive Note : Final technical rept.,


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


Personal Author(s) : Faunce,Norman P ; Mohrbach,Paul F


Report Date : 30 Sep 1963


Pagination or Media Count : 89


Abstract : For the purpose of demonstrating the thoroughness of a HERO testing program for all hot-wire bridged EED's a detailed evaluation of the RF characteristics of the protected model MARK 7 MOD O ignition element was performed. It is shown that an estimate of the RF sensitivity is possible from attenuation measurements made on as few as two or three elements. For example, power required to fire at 1 Gc was found to be 17.3 watts, from a 40-element Bruceton test. This represents about a 17 db increase in power over that required to fire using direct current. A power attenuation measurements on one EED at this same frequency was 18.4 db. Preceding these tests of the ignition element were intensive studies of improving RF power measuring techniques. At the higher frequencies where waveguides rather than coax are used, a technique which we have called the voltage min-max method was given considerable study. Measurements of the voltage minimum and voltage maximum of a standing wave in a waveguide permit power flow toward the termination to be determined. Using a precisely adjustable probe we can make measurements in systems with voltage standing wave ratios as high as 100. With increasing VSWR certain precautions are found necessary as a result of supporting theoretical studies. (Author)


Descriptors :   *EXPLOSIVES INITIATORS , *EXPLODING WIRES , HAZARDS , RADIATION HAZARDS , ORDNANCE , IGNITERS , RADIOFREQUENCY , DETONATORS , TEST METHODS , RADIOFREQUENCY POWER , VOLTAGE , MEASUREMENT


Distribution Statement : APPROVED FOR PUBLIC RELEASE