Visualization of the spatial distribution of current densities in a photographic system with a semiconductor photodetector

Salamov B.

IMAGING SCIENCE JOURNAL, cilt.47, ss.189-195, 1999 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 47 Konu: 4
  • Basım Tarihi: 1999
  • Doi Numarası: 10.1080/13682199.1999.11736359
  • Sayfa Sayıları: ss.189-195


This paper studies the visualization of the spatial distribution pattern of current density in a semiconductor photographic system with a gallium arsenide semiconductor photodetector. The spatial distribution of the current in the filaments was determined by photometric analysis of the gas discharge light emission when a current was passed through a photographic cell. This method ensured spatial resolution of similar to 10/mm and made it possible to describe quantitatively the distributions involving a drop in current density of greater than or equal to 10(2). Transformation of the profile and amplitude of the current density of the filaments in the different regions of the current-voltage characteristic (CVC) has been studied. The filamentation (i.e. an inhomogeneous distribution of the current density) was primarily due to the formation of a space charge of positive ions in the discharge gap between the photodetector and a transparent anode plate that changed the discharge from the Townsend type to the glow type.