Read-out devices of electric charge distributions on dielectric

Details Read-out devices of electric charge distributions on dielectric Read-out devices of electric charge distributions on dielectric

1983-04-18

1986-01-28

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358111, H04N 118

Patent

active

045675309

ABSTRACT:
In order to read-out and reproduce as a visible image the electric charge distribution carried by a dielectric sheet, and formed by the impact of X-rays having traversed a body to be analyzed, one has recourse to a detecting probe (2) out of center with respect to the axis of a head carrying the probe, the head being put in rotation at a high speed (for instance at 6,000 turns/minute), by a small turbine, the axis of the head being displaced relative to the surface of the sheet, parallel to the sheet along two perpendicular directions X and Y in such a way that the probe scans the sheet along a trajectory (T) which has the form of a circle the center of which is subjected to a transverse translation. The read-out can be made very rapidly and leads to a good signal
oise ratio. This allows the use of low irradiation doses for the object to be analyzed. Means can be used to compensate for variations of distance between the probe and the sheet.

REFERENCES:
patent: 4134137 (1979-01-01), Jacobs
patent: 4385306 (1983-05-01), Conta
patent: 4450489 (1984-05-01), Barry

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