Process for centering an ionizing radiation sweep beam and devic

Details Process for centering an ionizing radiation sweep beam and devic Process for centering an ionizing radiation sweep beam and devic

1975-06-03

1976-08-17

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

250397, G01T 116, H01J 3928

Patent

active

039756408

ABSTRACT:
A centering process for detecting the centering errors of a sweep beam impinging on a target and correcting them, this process comprising comparing a signal V.sub.E, corresponding to the difference between electric signals received on the two halves of an electrode, with threshold voltages .+-.v.sub.e and comparing a signal V.sub.B, corresponding to the voltage controlling the sweep of the beam, with threshold voltages .+-.v.sub.b, the transmission of a signal V.sub.p corresponding to V.sub.E < + v.sub.e and V.sub.B < - v.sub.b (or of a signal v.sub.n corresponding to V.sub.E < - v.sub.e and V.sub.B > + v.sub.b) indicating the direction of the centering error and its amplitude. The process permits controlling the centering of a sweep beam on secant axes making an angle .theta. therebetween.

REFERENCES:
patent: 3808441 (1974-04-01), Boux
patent: 3838284 (1974-09-01), McIntyre et al.
patent: 3845310 (1974-10-01), Perraudin

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