Claims
- 1. A calibrating method for an electron pattern generator, said generator having a sample holder, means for displacing said sample holder in two mutually perpendicular directions, a data processing system for sweeping said sample area by area, and each area line by line, and each line, point by point, said calibrating method comprising the following steps of:
- manufacturing a marker upon said sample, at a given area bombarded by said beam at its rest position with a material capable of upon the impact of the electron beam, scattering electrons, and generating in response to this impact an electric signal;
- transducing said signal into an image upon the screen of a cathode ray oscilloscope, by applying said signal upon the control electrode of said tube;
- applying a programmed pattern simultaneously and synchronously to said oscilloscope and to said generator deflection system for displaying on said screen a predetermined figure centered about the image of said marker;
- giving a predetermined mechanical displacement to said holder, and applying the voltage corresponding to said displacement to said deflection system of said pattern generator; and
- centering again said figure about said image of said marker.
- 2. A method as claimed in claim 1, wherein said pattern is a square.
- 3. A method as claimed in claim 2 wherein said mechanical displacement are made successively along both mutually perpendicular directions and in each direction, in both senses, the four displacements thus obtained having the same amplitude.
- 4. A method as claimed in claim 2, comprising the further step of simultaneously displaying the four figures upon said screen, this screen having persistent properties.
Priority Claims (1)
Number |
Date |
Country |
Kind |
74 02572 |
Jan 1974 |
FR |
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Parent Case Info
This is a continuation, of application Ser. No. 543,949 filed Jan. 24, 1975, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3857041 |
Spicer |
Dec 1974 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
543949 |
Jan 1975 |
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