Laser Readout Of Electrostatic Images

Alfonso Zermeno; Thomas Kirby; Ronald Cowart; Lee Marsh; Poen Ong

doi:10.1117/12.957128

6 July 1979 Laser Readout Of Electrostatic Images

Alfonso Zermeno, Thomas Kirby, Ronald Cowart, Lee Marsh, Poen Ong

Proceedings Volume 0173, Application of Optical Instrumentation in Medicine VII; (1979) https://doi.org/10.1117/12.957128
Event: Application of Optical Instrumentation in Medicine VII, 1979, Toronto, Canada

Abstract

An electrostatic radiographic receptor has been designed that allows the latent image resulting from an x-ray exposure to be reconstructed by means of a scanning laser beam. The receptor can be described as a duodielectric device making use of amorphous selenium as one of the dielectric components. The second dielectric component is a polyester sheet with a transparent gold coating on one side. Charges may be trapped at the surface of the selenium by placing an electric field across the structure while exposing it to light. A technique is described in which either subsequent polarity reversal or placing a short-circuit across the structure isolates these charges. Exposure to x-ray at this point selectively discharges the selenium surface, thus creating an electrostatic image. Further exposure of the system to a scanning light source produces a displacement current as the structure is totally discharged element by element. The resulting video signal is used to generate images of the charge pattern.

Citation Download Citation

Alfonso Zermeno, Thomas Kirby, Ronald Cowart, Lee Marsh, and Poen Ong "Laser Readout Of Electrostatic Images", Proc. SPIE 0173, Application of Optical Instrumentation in Medicine VII, (6 July 1979); https://doi.org/10.1117/12.957128

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