| 摘要 |
The process according to the invention consists in affixing a marker (5) including at least one bound or transition, in measuring by means of a fixed detector (6) a value (d1-d2) dependent on the distance between at least two points (51, 5'1-52, 5'2) of the bound by moving the object (1-8) in one direction of sweep, in comparing the said value (d1-d2) with a set-point value (d0) and in using this information to modify the position of the object or of the element on the one hand in the said direction of sweep and on the other hand in a direction different to the sweep direction. <IMAGE>
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