Accession Number : AD0452744


Title :   EVALUATION OF SIGMA V-97 SURFACE-PASSIVATED, PHOTOCONDUCTIVE CELLS


Corporate Author : COAST GUARD WASHINGTON DC


Personal Author(s) : Chapman, P O


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/452744.pdf


Report Date : 11 Dec 1964


Pagination or Media Count : 17


Abstract : This report covers the comparison of surfacepassivated and non- surface-passivated, CdS photoconductive cells for use as sun relays for solid state flashers. Both accelerated tests in a controlled humidity chamber and exposure tests were conducted. The exposure tests revealed that the surface- passivated cells had a significantly longer life than the non-surface-passivated cells. The normal failure of a non-surfacepassivated cell was to increase its resistance at a predetermined illuminance level while the failure of a surface- passivated cell was to decrease its resistance. The surface-passivated cell was not fail safe since it would not turn on the flasher until the ambient illuminance was much less than the predetermined level.


Descriptors :   *NAVIGATIONAL AIDS , ILLUMINATION , SURFACE PROPERTIES , ELECTRICAL RESISTANCE , CADMIUM COMPOUNDS , PHOTOCONDUCTIVITY , PROTECTIVE TREATMENTS , NAVIGATIONAL LIGHTS , PERFORMANCE(ENGINEERING) , SULFIDES


Subject Categories : Navigation and Guidance


Distribution Statement : APPROVED FOR PUBLIC RELEASE