Abstract
ABSTRACT This paper reports on minimising measurement errors that are characteristic of small distances of the object plane throughcontinuous focusing of optical systems that concentrate radiation on a typical opto-eletronic detection device. One suchsystem is the catoptric objective that uses a focusing system based on the movement of a mobile element inside theobjective (e.g. the secondary mirror of a Cassegrain optical system. maintaining a fixed posifion of the detection device withrespect to the primary mirror). Our results show that decreasing the distance between the mobile and fixed element leads toan increase of the focal distance and consequently of the object plane distance. The measurement precision increases withoptical ampiffication. and hence, we studied the way optical amplification changes with a continuous focusing, in twodifferent situations: the detection device is calibrated at the maximum distance and the detection device is calibrated at theminimum distance. Finally, we present different examples of variation of measurement precision for discrete values of
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