Radiant energy – Inspection of solids or liquids by charged particles – Analyte supports
Patent
1978-11-20
1980-07-01
Church, Craig E.
Radiant energy
Inspection of solids or liquids by charged particles
Analyte supports
250439R, G01N 2134, G01N 2304
Patent
active
042108152
ABSTRACT:
An x-ray receptor is translatable in x and y directions relative to the angulation axis of an x-ray source. Servo motors angulate the source and receptor coordinately with translation so the central ray of the x-ray beam from the source will be perpendicular to the input plane of the receptor when an x-ray exposure is made. New circuitry prohibits making an exposure until the source and receptor are properly angulated. Potentiometers develop signals corresponding with x and y distances and these are divided to get a servo motor command signal corresponding with the tangent of the angulation angle .theta.. Potentiometers driven coordinately with the receptor and source produce respective sets of signals corresponding with true instantaneous or real time angles .theta. and tangent .theta.. The first tangent .theta. command signal is continuously compared with the other tangent .theta. signals and the first tangent .theta. signal is independently compared with the actual angle .theta. with separate window comparators. As long as any pair of signals do not compare, the x-ray tube power supply is disabled.
REFERENCES:
patent: 4024401 (1977-05-01), Bernstein et al.
patent: 4024403 (1977-05-01), Bernstein et al.
Church Craig E.
General Electric Company
Hohenfeldt Ralph G.
O'Hare Thomas P.
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