A METHOD OF DIRECT CORONA IMAGING ON A DIELECTRIC TRANSPARENCY

The standard scheme of Kirlian photography is modified to have water o n top of a thin mylar dielectric layer underneath which the object is placed. Water serves both as an electrode and as a constant-temperatur e heat reservoir. High voltage (HV) is applied between object and wate r to create sustained corona discharges. Experiments showed that, unde r an ac or pulsating-current excitation over a duration of minutes, a permanent optical image becomes retained on the mylar surface, which i s then usable for projection or for direct viewing with slanted lighti ng. Direct current approaches were found inefficient to produce the sa me results. A thermo-plastic theory is hypothesized to account for the observations.