Direct charge readout electron radiography apparatus with improv

Details Direct charge readout electron radiography apparatus with improv Direct charge readout electron radiography apparatus with improv

1977-01-14

1978-04-18

Dixon, Harold A.

Radiant energy

Invisible radiant energy responsive electric signalling

Semiconductor system

250213VT, G01T 122

Patent

active

040853276

ABSTRACT:
An improved direct charge readout electron radiography apparatus of the type having an upper electrode receiving differentially-absorbed X-radiation, a lower electrode including a plurality of parallel transparent, conductive strips overlaid with a layer of photoconductive material; and means for scanning a beam of light through the transparent strips and into the overlying photoconductive material layer for selectively transferring charge patterns induced therein responsive to the pattern of differentially-absorbed X-radiation, utilizes at least one lead means strip, positioned substantially transverse to, and spaced from the ends of, the plurality of conductive strips. The transverse lead means strip is connected to sequential ones of the parallel strips responsive to illumination of the photoconductive material in the area between the transverse strip and an adjacent end of each sequential parallel strip. The reduction in device capacitance in parallel with a device output signal, facilitates an increase of about 100 times in the amount of readable charge, for equal exposures. Apparatus for optically scanning each conductive strip; while maintaining the connection thereof to the transverse lead means, is also disclosed.

REFERENCES:
patent: 3564245 (1971-02-01), Koehler
patent: 3970844 (1976-07-01), Fenn et al.

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